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Basis of Accounting [Text Block]

1.	BASIS OF PRESENTATION AND ACCOUNTING POLICIES

The condensed consolidated financial statements include the accounts of SEACOR Marine Holdings Inc. and its consolidated subsidiaries (the “Company”). In the opinion of management, all adjustments (consisting of normal recurring adjustments) have been made to fairly present the unaudited condensed consolidated financial statements for the periods indicated. Results of operations for the interim periods presented are

not

necessarily indicative of operating results for the full year or any future periods.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the Company’s financial statements and related notes thereto included in the Company's Annual Report on Form

-K for the year ended

December

31,

2017.

Unless the context otherwise indicates, any reference in this Quarterly Report on Form

-Q to the “Company” refers to SEACOR Marine Holdings Inc. and its consolidated subsidiaries and any reference in this Quarterly Report on Form

-Q to “SEACOR Marine” refers to SEACOR Marine Holdings Inc. without its consolidated subsidiaries. Capitalized terms used and

not

specifically defined herein have the same meaning given those terms in the Company's Annual Report on Form

-K for the year ended December

31,

2017.

SEACOR Marine was previously a subsidiary of SEACOR Holdings Inc. (along with its consolidated subsidiaries, other than SEACOR Marine and its subsidiaries, collectively referred to as “SEACOR Holdings”). On

June 1, 2017,

SEACOR Holdings completed a spin-off of SEACOR Marine by way of a pro rata dividend of SEACOR Marine’s common stock, par value

$0.01

per share (“Common Stock”), all of which was then held by SEACOR Holdings, to SEACOR Holdings’ shareholders of record as of

May 22, 2017 (

the “Spin-off”). SEACOR Marine entered into certain agreements with SEACOR Holdings to govern SEACOR Marine’s relationship with SEACOR Holdings following the Spin-off, including a Distribution Agreement,

two

Transition Services Agreements, an Employee Matters Agreement and a Tax Matters Agreement. Immediately following the Spin-off, SEACOR Marine began to operate as an independent, publicly traded company.

Recently Adopted Accounting Standards.

May 2014,

the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)

2014

09,

“

Revenue from Contracts with Customers (Topic

606

)

” to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements. The new standard supersedes current revenue recognition requirements and industry-specific guidance. Under the new standard, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The Company adopted this new standard on

January 1, 2018

using the modified retrospective approach by recognizing the cumulative effect of initially applying the new standard as an adjustment to the opening balance of accumulated deficit. The Company implemented the necessary changes to its business processes, systems and controls to support recognition and disclosure of this ASU upon adoption. The Company's revenues are primarily based on leases or rental agreements with customers which are

not

addressed in the new standard. As a result, the adoption of the standard did

not

have a material effect on the Company's financial position, results of operations or cash flows, but did result in increased disclosures related to revenue recognition policies.

November 2016,

the FASB issued ASU

2016

18,

“

Statement of Cash Flows (Topic

230

) – Restricted Cash

”

which requires that amounts generally described as restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statement of cash flows. The Company adopted this new standard on

January 1, 2018.

Retrospective presentation was required. The adoption of the standard did

not

have a material effect on the Company's financial position, results of operations or cash flows. In accordance with ASU

2016

18,

the Company has included restricted cash as part of the beginning-of-period and end-of-period cash balances on the condensed consolidated statement of cash flows.

Revenue Recognition.

Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers over control of the promised goods or services to its customers. Costs to obtain or fulfill a contract are expensed as incurred.

Lease Revenues.

The primary source of the Company’s revenues is earned through time charter and bareboat agreements. Time charter and bareboat agreements are rental agreements that are recognized ratably over the lease term as the services are provided, typically on a per day basis. The charterer will take the vessel on hire for a specific period of time and uses the vessel to move cargo, people or equipment and will pay the Company a rate per day. Under a time charter the Company provides a vessel to a customer for a set term and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer for a set term and the customer assumes responsibility for all operating expenses and the risk of operati

on (see Note

Revenues from Customers.

The Company contracts with various customers to carry out management services for vessels as agents for and on behalf of ship owners. These services include crew management, technical management, commercial management, insurance arrangements, sale and purchase of vessel, provisions and bunkering. As the manager, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services hereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span over the length of

one

three

years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incu

rred (see Note

Revenue that does

not

meet these criteria is deferred until the criteria is met and are considered contract liabili

ties. Contract liabilities, i

ncluded in other current liabilities in the accompanying condensed consolidated balance sheets, for the

nine

months ended

September 30

were as follows (in thousands):

	201 8			201 7
Balance at beginning of period	$	10,104		$	6,953
Revenues deferred during the period		2,756			3,147
Revenues recognized during the period		(3,191	)		—
Balance at end of period	$	9,669		$	10,100

As of

September

30, 2018,

contract liabiliti

es of

$6.8

million related to the time charter of several offshore support vessels paid through the conveyance of an overriding royalty interest (the “Conveyance”) in developmental oil and gas producing properties operated by a customer in the U.S. Gulf of Mexico. Payments under the Conveyance, and the timing of such payments, were contingent upon production and energy sale prices. On

August 17, 2012,

the customer filed a voluntary petition for Chapter

bankruptcy. The Company is vigorously defending its interest in connection with the bankruptcy filing; however, payments received under the Conveyance subsequent to

May 19, 2012

are subject to creditors’ claims in bankruptcy court.

The Company will recognize revenues when reasonably assured of a judgment in its favor. All costs and expenses related to these charters were recognized as incurred.

As of

September

30, 2018,

contract liabilities of

$2.5

million re

lated to the time charter of an offshore support vessel to a customer for which collection was

not

reasonably assured. The Company will recognize revenues when collected or when collection is reasonably assured. All costs and expenses related to this charter were recognized as incurred.

The remaining balance of

$0.4

million as of

September 30, 2018

is comprised of contract liabilities to

two

customers for which collection is

not

reasonably assured.

Property and Equipment.

Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically

not

justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company

may

acquire older assets that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date.

As of

September

30, 2018,

the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore Support Vessels:
Wind farm utility vessels			10
All other offshore support vessels (excluding wind farm utility)			20

Equipment maintenance and repair costs and the costs of routine overhauls, drydockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized.

Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. During the

nine

months ended

September 30, 2018,

capitalized interest total

$1.6

million.

Impairment of Long-Lived Assets.

The Company performs an impairment analysis of long-lived assets used in operations, including intangible assets, when indicators of impairment are present. These indicators

may

include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are

not

recoverable, as determined by the estimated undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. The Company performs its testing on an asset or asset group basis. Generally, fair value is determined using valuation techniques, such as expected discounted cash flows or appraisals, as appropriate. During the

nine

months ended

September 30, 2018,

the Company recognized

$3.0

million of imp

airment charges primarily related to

four

anchor handling towing supply vessels removed from service and adjusted to scrap value.

Impairment of

50%

or Less Owned Companies.

Investments in

50%

or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the

Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results

may

vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the

nine

months ended

September 30, 2018,

the Company recognized impairment charges of

$1.2

million related to

one

of its

50%

or less owned companies which the Company believes will be unable to meet all of its liabilities.

Income Taxes.

During the

nine

months ended

September 30, 2018,

the Company's effective income tax rate of

15.5

was primarily due to taxes provided on income attributable to noncontrolling interests, foreign sourced income

not

subject to U.S. income taxes, foreign taxes

not

creditable against U.S. income taxes, a return-to-provision adjustment and a reversal of an unrecognized tax benefit. During the

nine

months ended

September 30, 2017,

the Company’s effective income tax rate of

27.4%

was primarily due to losses of foreign subsidiaries

not

benefited, non-deductible expenses associated with the Company's participation in SEACOR Holdings' share award plans and non-deductible Spin-off related expenses reimbursed to SEACOR Holdings.

Deferred Gains.

he Company has sold certain equipment to its

50%

or less owned companies, entered into vessel sale-leaseback transactions with finance companies and provided seller financing on sales of its equipment to

third

parties and its

50%

or less owned companies. A portion of the gains realized from these transactions were deferred and recorded in deferred gains and other liabilities in the accompanying condensed consolidated balance sheets. Deferred gain activity related to these transactions for the

nine

months ended

September 30

was as follows (in thousands):

	2018			2017
Balance at beginning of period	$	25,006		$	33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense		(6,053	)		(6,109	)
Other adjustments		(416	)		(364	)
Balance at end of period	$	18,537		$	27,437

Accumulated Other Comprehensive Income (Loss).

The components of accumulated other comprehensive loss were as follows (in thousands):

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		(1,358	)		(48	)		(1,406	)		(48	)		(4	)	$	(1,458	)
Income tax expense		—			(46	)		(46	)		—			—			(46	)
Nine months Ended September 30, 2018	$	(14,553	)	$	608		$	(13,945	)	$	(1,405	)	$	(3	)	$	(1,504	)

Loss Per Share.

asic loss per common share of the Company is computed based on the weighted average number of common shares and warrants to purchase common shares at an exercise price of

$0.01

per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic loss per common share because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore

not

anti-dilutive. Diluted loss per common share of the Company is computed based on the weighted average number of common shares and Warrants issued and outstanding plus the effect of potentially dilutive securities through the application of the if-converted method that assumes all common shares have been issued and outstanding during the relevant periods pursuant to the conversion of the Convertible Senior Notes.

For the

nine

months ended

September 30, 2018

and

2017,

diluted earnings per common share of the Company excluded

2,183,708

and

4,070,500

common shares, respectively, issuable pursuant to the Company’s Convertible Senior Notes (see Note

) as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the

nine

months ended

September 30, 2018,

diluted loss per common share of the Company excluded

196,338

shares of restricted stock and

732,191

shares of stock issuable upon exercise of outstanding stock options as the effect of their inclusion in the computation would be anti-dilutive.

While calculating the weighted average basic and diluted number of common shares and warrants issued and outstanding for the quarter ending

September 30, 2018,

the Company discovered that it had understated the weighted average basic and diluted common shares and warrants issued and outstanding for both the

three

months and

six

months ended

June 30, 2018.

As a result of this error, the Company also overstated the basic and diluted loss per common share and warrant for the same

two

periods. The correct weighted average basic and diluted common shares and warrants for the

three

months ended

June 30, 2018

was

21,035,214,

an increase of

1,056,698

versus the number previously reported. This increase results in a corrected basic and diluted loss per common share and warrant of

$1.19

versus

$1.25

previously reported. The correct weighted average basic and diluted common shares and warrants for the

six

months ended

June 30, 2018

was

19,312,923,

an increase of

1,345,681

versus the number previously reported. This increase results in a corrected basic and diluted loss per common share and warrant of

$2.79

versus

$3.00

previously reported. The net loss attributable to the Company for the

three

and

six

months ended

June 30, 2018,

as well as all prior year numbers were

not

impacted.

Upon assessing the error from both a quantitative and qualitative perspective, the Company concluded the error was

not

material to the

June 30, 2018

financial statements and has

impact on the

September 30, 2018

financial statements presented herein.

New Accounting Pronouncements.

February 25, 2016,

the Financial Accounting Standards Board (“FASB”) issued a comprehensive new leasing standard meant to improve transparency and comparability among companies by requiring lessees to recognize a lease liability and a corresponding right-of-use asset for virtually all lease contracts. It also requires additional disclosures about leasing arrangements. The Company will adopt the new standard on

January 1, 2019

and will apply the transition provisions of the new standard at its adoption date with recognition of a cumulative-effect adjustment to the opening balance of retained earnings. The Company believes the adoption of the new standard will have a material impact on its consolidated financial position, results of operations and cash flows, estimated to be

$40

million to

$75

million in new right-of-use assets and corresponding lease liabilities for certain of its equipment, office and land leases. The Company's estimates are preliminary and are based on its cu

rrent inventory of leases. If the Company enters into or exits material lease arrangements prior to adoption or makes material changes to certain of its assumptions, including lease discount rates, the Company's estimates

may

change and those changes

may

be material.

February 2018,

the FASB issued a new accounting standard which allows a reclassification from accumulated other comprehensive income to retained earnings of stranded tax effects resulting from the Tax Cuts and Jobs Act passed in

December 2017.

The standard is effective for interim and annual periods beginning after

December 15, 2018.

The Company does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

June 2018,

the FASB issued a new accounting standard which addresses aspects of the accounting for nonemployee share-based payment transactions. The standard is effective for interim and annual periods beginning after

December 15, 2018.

The Company does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

August 2018,

the FASB issued a new accounting standard which provided guidance regarding the accounting for fees paid by a customer in a cloud computing arrangement (hosting arrangement). The standard is effective for interim and annual periods beginning after

December 15, 2019.

The Company is evaluating the provisions of the standard, but does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

Note 2 - Equipment Acquisitions and Dispositions

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment Disclosure [Text Block]

2.	EQUIPMENT ACQUISITIONS AND DISPOSITIONS

During the

nine

months ended

September 30, 2018,

capital acquisitions were

$44.6

million. Equipment deliveries during the

nine

months ended

September 30, 2018

include

two

wind farm utility vessels a

two

platform supply

vessels which were constructed through the SEACOSCO joint venture as described in Note

below. Equipment acquisitions include

six

liftboats contributed from Montco Offshore, LLC (“MOI”) to certain wholly-owned subsidiaries of Falcon Global Holdings LLC (“FGH”) as described in

Note

below, and

two

anchor handling towing supply vessels that were previously managed (but

not

owned) by the Company.

During the

nine

months ended

September 30, 2018,

the Company sold

one

fast support vessel and

two

supply vessels previously retired and removed from service,

one

anchor handling towing supply vessel,

two

standby safety vessels,

three

fast support vessels

one

wind farm utility vessel, and other property and equipment for net proceeds of

$4.0

million (

$3.9

million in cash and

$0.1

million of previously received deposits) and gains of

$2.0

million. In addition, the Company received

$1.4

million in deposits for future asset sales.

Note 3 - Investments, at Equity, and Advances to 50% or Less Owned Companies

9 Months Ended

Sep. 30, 2018

Equity Method Investments and Joint Ventures Disclosure [Text Block]

3.	INVESTMENTS, AT EQUITY AND ADVANCES TO 50% OR LESS OWNED COMPANIES

SEACOSCO

. On

January 17, 2018,

the Company announced the formation of SEACOSCO Offshore LLC (“SEACOSCO”), a Marshall Islands entity jointly owned by the Company and affiliates of COSCO SHIPPING GROUP (“COSCO SHIPPING”). SEACOSCO entered into contracts for the purchase of

eight

Rolls-Royce designed, new construction platform supply vessels (“PSVs”) from COSCO SHIPPING HEAVY INDUSTRY (GUANGDONG) CO., LTD (the “Shipyard”), an affiliate of COSCO SHIPPING, for approximately

$161.1

million, of which

70%

will be financed by the Shipyard and secured by the PSVs on a non-recourse basis to the Company. SEACOSCO took delivery of

two

vessels in the quarter ending

March 31, 2018,

took title to another

five

of the PSVs in the quarter ending June

30,

2018

and expects to take title to

one

vessel in

2019.

Thereafter, the Shipyard, at its cost, will store the PSVs at its facility for periods ranging from

six

months. The Co

mpany owns an unconsolidated

50%

interest in SEACOSCO. During the

nine

months ended

September 30, 2018,

the Company contributed capital of

$27.0

million in cash. The expected remaining capital commitment of approximately

$5.3

million will be due over the remainder of

2018

and the

first

half of

2019.

The Company is responsible for full commercial, operational, and technical manag

ement of the vessels on a worldwide basis.

SEACOR Grant DIS.

September 30, 2018,

the Company estimates that SEACOR Grant DIS will be unable to meet all its liabilities and has recorded a bad debt reserve of

$0.5

million against SEACOR Grant DIS’s liability to the Company and an impairment charge of

$1.2

million to reduce its investment carrying value to zero. SEACOR Grant DIS is currently in discussions to sell its

one

vessel to a

third

party, which may provide proceeds that are available to its debt holders including the Company.

SEACOR Marlin.

The Company created a new subsidiary, SEACOR Marlin LLC (“SMLLC”) and contributed the Seacor Marlin supply vessel into SMLLC. On

September 13, 2018,

the Company sold

51%

of SMLLC to MexMar Offshore (MI) LLC (“MexMar Offshore”), a wholly-owned subsidiary of MexMar, for

$8.0

million in cash, which generated a gain of

$0.4

million. The Seacor Marlin supply vessel was pledged as collateral under the MexMar credit facility, for which the Company receives an annual collateral fee. SMLLC is a

50%

or less owned company and will be accounted for using the equity method of accounting.

OSV Partners.

SEACOR

OSV Partners I LP (“OSV Partners”), which owns and operates

five

offshore support vessels, had been in non-compliance with certain financial covenants under its term loan facility. On

September 28, 2018,

such facility, in the principal amount outstanding of

$27.3

million, was restructured to, among other things, extend its maturity to

September 28, 2021

and, in connection therewith, the Company participated in a

$5.0

million preferred equity offering of OSV Partners and a subordinated loan in the amount of

$5.0

million, investi

$1.1

million

in such preferred equity (and committing to invest an addition

$1.1

million in

such preferred equity if called by the general partner of OSV Partners prior to

September 30, 2020)

and providing

$2.1

million of such loan. The lenders to OSV Partners have

recourse to the Company for outstanding amounts under the facility and the Company is

not

obligated to make any future investment in or loan any money to OSV Partners.

Guarantees.

The Company has guaranteed certain of the outstanding charter receivables of

one

of its managed

50%

or less owned companies if a customer defaults in payment and the Company either fails to take enforcement action against the defaulting customer or fails to assign its right of recovery against the defaulting customer. As of

September 30, 2018,

the total amount guaranteed by the Company under this arrangement is

$0.5

million.

In addition, as of

September 30, 2018,

two

of the Company's

50%

or less owned companies have bank debt secured by, among other things, a

first

preferred mortgage on the Company's vessels. The banks also have the authority to require the Company and its partners to fund uncalled capital commitments, as defined in the partnership agreements. In such event, the Company would be required to contribute its allocable share of uncalled capital, which was, as of September

30,

2018,

$1.0

million in the aggregate. This liability is included in other long-term liabilities.

Note 4 - Long-term Debt

9 Months Ended

Sep. 30, 2018

Long-term Debt [Text Block]

4.	LONG-TERM DEBT

Convertible Senior Notes.

December 1, 2015,

the Company issued

$175.0

million in aggregate principal amount of its Convertible Senior Notes (the “Convertible Senior Notes”), at an interest rate of

3.75%,

due

December 1, 2022,

to investment funds managed and controlled by the Carlyle Group (collectively “Carlyle”). The Convertible Senior Notes are convertible into shares of Common Stock at a conversion rate of

23.26

shares per

$1,000

in principal amount of such notes, subject to certain conditions, or, into Warrants to purchase an equal number of shares of Common Stock at an exercise price of

$0.01

per share in order to facilitate the Company's compliance with the provisions of the Jones Act.

May 2, 2018,

the Company and Carlyle entered into an exchange transaction (the “Exchange”) pursuant to which Carlyle exchanged

$50

million in principal amount of the Convertible Senior Notes for Warrants to purchase

1,886,792

shares of Common Stoc

k (to facilitate compliance with the provisions of the Jones Act) at an exercise price of

$0.01

per share, subject to adjustments (the “Carlyle Warrants”), representing an implied exchange rate of approximately

37.73

shares per

$1,000

in principal amount of the Convertible Senior Notes (equivalent to an exchange price of

$26.50

per share). The Carlyle Warrants have a

-year term, which commenced

May 2, 2018.

The Company and Carlyle also amended the

$125.0

million in p

rincipal amount of Convertible Senior Notes that remained outstanding following the Exchange to (i) increase the interest rate from

3.75%

per annum to

4.25%

per annum and (ii) extend the maturity date of the Convertible Senior Notes by

months to

December 1, 2023

. Interest on the Convertible Senior Notes is payable semi-annually on

June 15

and

December 15

of each year.

MOI Joint Venture.

ebruary 8, 2018,

a wholly-owned subsidiary of SEACOR Marine and MOI formed and capitalized a joint venture named Falcon Global Holdings LLC. In connection therewith and MOI’s plan of reorganization, which was confirmed on

January 18, 2018,

MOI emerged from its Chapter

bankruptcy case. In accordance with the terms of a Joint Venture Contribution and Formation Agreement, the Company and MOI contributed certain liftboat vessels and other related assets to FGH and its designated subsidiaries and FGH and its designated subsidiaries assumed certain operating liabilities and indebtedness associated with the liftboat vessels and related assets. On

February 8, 2018,

Falcon Global USA LLC (“FGUSA”), a wholly-owned subsidiary of FGH, paid

$15.0

million of MOI’s debtor-in-possession obligations and entered into a

$131.1

million credit agreement comprised of a

$116.1

million term loan (the “FGUSA Term Loan”) and a

$15.0

million revolving loan facility (the “FGUSA Revolving Loan Facility”) bearing interest at a variable rate (currently

6.63%

), maturing in

2024

and secured by vessels owned by wholly-owned subsidiaries of FGUSA (collectively, the “FGUSA Credit Facility”). The full amount of the FGUSA Term Loan and other amounts paid by affiliates of MOI satisfied in full the amounts outstanding under MOI’s pre-petition credit facilities. The FGUSA Credit Facility, apart from a guarantee of certain interest payments and participation fees for

two

years after the closing of the transactions, is non-recourse to SEACOR Marine and its subsidiaries other than FGUSA. The Company performed a fair market valuation of the debt reflecting a debt discount of

$10.0

million, which will be amortized over the life of the FGUSA Credit Facility. Scheduled principal payments begin in

202

During the

nine

months ending

September 30, 2018

the Company borrowed

$15.0

million under the FGUSA Revolving Loan Facility for working capital purposes. The Company consolidates FGH as the Company holds

72%

of the equity interest in FGH and is entitled to appoint a majority of the board of managers of FGH.

Windcat.

ring the

nine

months ended

September 30, 2018,

the Company converted

€6.0

million denominated debt to pound sterling denominated debt, paying off approximately

$7.5

million in euro denominated debt and borrowing approximately

$8.5

million in pound sterling denominated debt, resulting in a net increase in USD borrowings of

$1.0

million to be used for future capital commitments.

Seacor

88/888.

July 5, 2018,

a wholly-owned subsidiary of SEACOR Marine entered into a new term loan of

$11.0

million and used the funds to acquire

two

vessels that were previously managed (but

not

owned) by the Company. The term loan matures in

2023,

bears interest at a variable rate (currently

5.9%

) and is secured by the

two

vessels. SEACOR Marine provided a limited guaranty of such loan under which claims recoverable from SEACOR Marine shall

not

exceed the lesser of (

)

$5.5

million and (y)

50%

of the obligations outstanding at the time a claim is made thereunder. In

October 2018,

the Company entered into an interest rate swap agreement on the notional value of

$5.5

million related to this loan.

Seacor Marine Foreign Holdings

September 26, 2018,

SEACOR Marine Foreign Holdings Inc. (“SMFH”), a wholly-owned subsidiary of SEACOR Marine, entered into a

$130.0

million loan facility with a syndicate of lenders administered by DNB Bank ASA. SMFH's obligations pursuant to the loan facility are secured by mortgages on

vessels owned by the Company's vessel owning subsidiaries as well as an assignment of earnings from those subsidiaries. The loan matures in

2023

and bears interest at a variable rate (currently

6.1875%

). The obligations of SMFH under the loan facility are guaranteed by SEACOR Marine. The proceeds from the syndicated loan facility were used to pay off other credit facilities of subsidiaries of the Compan

y (

$101.3

million, made up of

$99.9

million principal and

$1.4

million accrued interest), resulting in a net increase in term debt of

$30.1

million. Principal payments of

$3.3

million per quarter will begin in

December 2018.

October 2018,

the Company entered into an interest rate swap agreement on the notional value of

$65.5

million related to this debt. As a result of this transaction, the Company recognized a loss of

$0.6

million upon the extinguishment of debt.

Letters of Credit

. As of

September 30, 2018,

the Company had outstanding letters of credit of

$5.8

million securing

one

long-term debt obligation,

$0.3

million securing

one

lease obligation and

$2.5

million

for labor and performance guarantees.

Note 5 - Income Taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Text Block]

5.	INCOME TAXES

The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate on continuing operations for the

nine

months ended

September 30, 2018:

Statutory rate	21.0	%
Noncontrolling interests	(1.0	%)
Foreign earnings not subject to U.S. income tax	(3.2	)%
Foreign taxes not creditable against U.S. income tax	(2.9	)%
Unrecognized tax benefit	4.5	%
Return to provision adjustment	(4.0	)%
Other	1.1	%
	15.5	%

As of

December 31, 2017,

the Company's net operating loss carryforwards excluded potential tax benefits of

$3.9

million as a result of uncertainty regarding interpretation of the new U.S. tax legislation signed into law on

December 22, 2017.

Subsequent guidance has confirmed that the Company should recognize the tax benefits of

$3.9

million and therefore, for the

nine

months ending September

30,

2018,

the Company removed the valuation allowance previously established against the net operating loss carryforwards.

During the preparation of the

2017

federal income tax return in the

third

quarter of

2018,

the Company realized management overestimated the available foreign taxes that could be credited against the

2017

transition tax. This resulted in an additional tax liability of

$3.4

million on its

2017

federal income tax return. This additional liability was recorded as a return-to-provision adjustment to tax expense during the

three

months ended

September 30, 2018.

Upon assessing the out of period adjustment from both a quantitative and qualitative perspective, the Company believes that this out of period adjustment is immaterial to both the year ended

December 31, 2017

and the

three

months ended

September 30, 2018

financial statements.

Note 6 - Derivative Instruments and Hedging Strategies

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Text Block]

6.	DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES

Derivative instruments a

re classified as either assets or liabilities based on their individual fair values. The fair values of the Company’s derivative instruments as of

September 30, 2018

were as follows (in thousands):

	Derivative Asset (1)		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	—	$	10	(2)
		—		10
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		17,928
Interest rate swap agreements		1,565		25	(2)
	$	1,565	$	17,963

______________________

(

)

Included in other receivables in the accompanying condensed consolidated balance sheets.

( 2 )	Included in other current liabilities in the accompanying condensed consolidated balance sheets.

Cash Flow Hedges.

The

Company and certain of its

50%

or less owned companies have interest rate swap agreements designated as cash flow hedges. By entering into these interest rate swap agreements, the Company and its

50%

or less owned companies have converted the variable LIBOR or EURIBOR component of certain of their outstanding borrowings to a fixed interest rate. The Company recognized immaterial losses on derivative instruments designated as cash flow hedges during the

nine

months ended

September 30, 2018.

As of

September 30, 2018,

the interest rate swaps held by the Company and its

50%

or less owned companies were as follows:

•

Windcat Workboats had

two

interest rate swap agreements maturing in

2021

that call for the Company to pay a fixed rate of interest of (

0.03

)% on the aggregate notional value of

€15.0

million (approximately

$17.5

million) and receive a variable interest rate based on EURIBOR on the aggregate notional value.

•

MexMar had

five

interest rate swap agreements with maturities in

2023

that call for MexMar to pay a fixed rate of interest ranging from

1.71%

2.10%

on the aggregate amortized notional value

$100.5

million and

receive a variable interest rate based on LIBOR on the aggregate amortized notional value.

Other Derivative Instruments.

The Company recognized (losses) gains on derivative instruments

not

designated as hedging instruments for the

nine

months ended

September 30 as follows (in thousands):

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(11,096	)	$	13,119
Forward currency exchange, option and future contracts		—			(78	)
Interest rate swap agreements		1,299			(321	)
	$	(9,797	)	$	12,720

The conversion option liability relates to the bifurcated embedded conversion option in the Convertible Senior Notes (see Note

in this Quarterly Report on Form

-Q and Note

in the Company's Annual Report on Form

-K for the year ended December

31,

2017

The Company and certain of its

50%

or less owned companies have entered into interest rate swap agreements for the general purpose of providing protection against increases in interest rates, which might lead to higher interest costs. As of

September 30, 2018,

the interest rate swaps held by the Company or its

50%

or less owned companies were as follows:

•

OSV Partners had

two

interest rate swap agreements with maturities in

2020

that call for OSV Partners to pay a fixed rate of interest ranging from

1.89%

2.27%

on the aggregate amortized notional value of

$29.2

million and receive a variable interest rate based on LIBOR on the aggregate amortized notional value.

September 28, 2018,

the Company refinanced and extinguished its debts related to the following interest rate swaps:

•

Falcon Global International had an interest rate swap agreement maturing in

2022

that called for the Company to pay a fixed interest rate of

2.06%

on the amortized notional value of

$51.6

million and receive a variable interest rate based on LIBOR on the amortized notional value. The swap was terminated on September

28,

2018

with de minimis breakage costs, and the

$1.2

million fair market value of the swap was received in October

2018.

•

Sea-Cat Crewzer II had an interest rate swap agreement maturing in

2019

that called for Sea-Cat Crewzer II to pay a fixed rate of interest of

1.52%

on the amortized notional value of

$19.1

million and receive a variable interest rate based on LIBOR on the amortized notional value. The swap was terminated on September

28,

2018

with de minimis breakage costs, and the

$0.2

million fair market value of the swap was received in October

2018.

•

Sea-Cat Crewzer had an interest rate swap agreement maturing in

2019

that called for Sea-Cat Crewzer to pay a fixed rate of interest of

1.52%

on the amortized notional value of

$16.9

million and receive a variable interest rate based on LIBOR on the amortized notional value. The swap was terminated on September

28,

2018

with de minimis breakage costs, and the

$0.2

million fair market value of the swap was received in October

2018.

Note 7 - Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Text Block]

7.	FAIR VALUE MEASUREMENTS

The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines

three

levels of inputs that

may

be used to measure fair value.

Level

inputs are quoted prices in active markets for identical assets or liabilities.

Level

inputs are observable inputs other than quoted prices included in

Level

that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are

not

active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data.

Level

inputs are unobservable inputs that are supported by little or

market activity and are significant to the fair value of the assets or liabilities.

The Company’s financial assets

and liabilities as of

September

30, 2018

that are measured at fair value on a recurring basis were as follows (in thousands):

	Level 1		Level 2		Level 3
ASSETS
Derivative instruments (included in other receivables)	$	—	$	1,565	$	—
Construction reserve funds		35,596		—		—
LIABILITIES
Derivative instruments		—		35		17,928

Level

Measurement

. The fair value of the conversion option liability on the Convertible Senior Notes is estimated with significant inputs that are both observable and unobservable in the market and therefore is considered a

Level

fair value measurement. The Company used a binomial lattice model that assumes the holders will maximize their value by finding the optimal decision between redeeming at the redemption price or converting into shares of Common Stock. This model estimates the fair value of the conversion option as the differential in the fair value of the notes including the conversion option compared with the fair value of the notes excluding the conversion option. The significant observable inputs used in the fair value measurement include the price of Common Stock and the risk free interest rate. The significant unobservable inputs are the estimated Company credit spread and Common Stock volatility, which were based on comparable companies in the transportation and energy industries.

The estimated fair values of the Company’s othe

r financial assets and liabilities as of

September 30, 2018

were as follows (in thousands):

			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
ASSETS
Cash, cash equivalents and restricted cash	$	104,519	$	104,519	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		415,164		—		416,888		—

The carrying value of cash, cash equivalents and restricted cash approximates fair value. The fair value of the Company’s long-term debt was estimated based upon quoted market prices or by using discounted cash flow analysis based on estimated current rates for similar types of arrangements. It was

not

practicable to estimate the fair value of certain of the Company’s investments, at cost, in

50%

or less owned companies because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. Considerable judgment was required in developing certain of the estimates of fair value and, accordingly, the estimates presented herein are

not

necessarily indicative of the amounts that the Company could realize in a current market exchange.

The Company’s other assets and liabilities th

at were measured at fair value during the

nine

months ended

September 30, 2018

were as follows (in thousands):

	Level 1		Level 2		Level 3
ASSETS
Property and equipment:
Anchor handling towing supply	$	—	$	2,000	$	—
Liftboats		—		—		134,775

Property and equipment

During the

nine

months ended

September 30, 2018,

the Company recognized impairment charges of

$3.0

million primarily associated with certain vessels (see Note

). The

Level

fair values were determined based on the sales prices of similar property and equipment at scrap value.

The

Level

vessels listed above were contributed by MOI to wholly-owned subsidiaries of FGH and recorded at fair value. The

Level

fair values were determined based on

two

separate

third

party valuations using significant inputs that are unobservable in the market. Due to limited market transactions, the primary valuation methodology applied by both appraisers was an estimated cost approach less economic depreciation for comparable aged vessels. The

Level

fair value of the vessels was based on a simple average between the

two

appraisals.

The significant unobservable inputs used in the fair value measurement for the liftboats provided by the appraisers were based on i) quotes from local shipyards, ii) economic life ranging from

years and iii) economic obsolescence factor ranging from

45%

50%.

The calculated yearly physical depreciation was multiplied by the remaining useful life of each vessel, based on the date of build and the residual value was added back to arrive at a base cost approach value for each vessel.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 8 - Warrants

9 Months Ended

Sep. 30, 2018

Warrants and Rights [Text Block]

WARRANTS

April 26, 2018,

the Company closed a pri

vate placement of its Common Stock and Warrants to purchase its Common Stock (which were issued to certain investors in place of Common Stock to facilitate compliance with Jones Act restrictions) for aggregate gross proceeds of

$56,855,000

(the “PIPE Private Placement”) with certain qualified institutional buyers and other accredited investors. The PIPE Private Placement included the issuance of

2,168,586

shares of Common Stock (the “PIPE Shares”) and Warrants to purchase

674,164

shares of the Common Stock at an exercise price of

$0.01

per share (the “PIPE Warrants”). The PIPE Warrants were issued to Proyectos Globales de Energia y Servicios CME, S.A. de C.V. a variable capital corporation (sociedad anónima de capital variable) incorporated and existing under the laws of the United Mexican States (“CME”) and have a

-year term, which commenced

April 26, 2018.

As indicated in Note

May 2, 2018,

the Company and Carlyle entered into the Exchange pursuant to which Carlyle exchanged

$50.0

million in principal amount of the Convertible Senior Notes for the Carlyle Warrants. The Carlyle Warrants have a

-year term, which commenced

May 2, 2018.

May 31, 2018,

Carlyle exercised Carlyle Warrants to purchase a total of

250,585

shares of Common Stock (after giving effect to the withholding of

108

shares of Common Stock as payment for the exercise price of the Warrants - see Note

) (the “Carlyle Warrant Exercise”). Following the Carlyle Warrant Exercise, Carlyle holds Warrants to purchase

1,636,099

shares of Common Stock at an exercise price of

$0.01

per share.

June 8, 2018,

CME exercised PIPE Warrants and paid an aggregate cash exercise price of

$0.01

per share to purchase a total of

38,857

shares of Common Stock (the “CME Warrant Exercise”). Following the CME Warrant Exercise, CME holds Warrants to purchase

635,307

shares of Common Stock at an exercise price of

$0.01

per share.

	Weighted Average Exercise Price		Number of Warrants
Balance as of December 31, 2017		—		—
Warrants issued - January 1 - September 30, 2018	$	0.01		2,560,956
Warrants exercised - January 1 - September 30, 2018	$	0.01		(289,550	)
Balance as of September 30, 2018	$	0.01		2,271,406

Note 9 - Stockholders' Equity

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note Disclosure [Text Block]

9.	STOCKHOLDERS' EQUITY

January 1, 2018,

the Company adopted a new accounting standard issued by the FASB on

October 24, 2016,

which requires companies to account for the income tax effects of intercompany sales and transfers of assets other than inventory. The impact of the adoption of the new standard resulted in a reduction of

$12.1

million to the Company’s opening retained earnings.

February 8, 2018,

the Company formed FGH, a joint venture between the Company and MOI. In accordance with the terms of the Joint Venture Contribution and Formation Agreement, the Company and MOI contributed certain liftboat vessels and other related assets to the joint venture and assumed certain operating liabilities and indebtedness associated with the liftboat vessels and related assets. The transaction consolidates the

fifteen

liftboat vessels operated by the Company and

six

liftboat vessels previously operated by MOI. FGUSA, a wholly-owned subsidiary of FGH, paid

$15.0

million of MOI's debtor-in-possession obligations and entered into a

$131.1

million credit agreement comprised of the FGUSA Term Loan and the FGUSA Revolving Loan Facility. The Company performed a fair market valuation of the debt reflecting a debt discount of

$10.0

million, which will be amortized over the life of the FGUSA Credit Facility.

March 26, 2018,

the Company issued

103,213

shares of Common Stock to an accredited investor for a total of

$1.8

million in gross proceeds pursuant to a private placement in reliance on the exemption from registration set forth in Section

(a)(

) of the Securities Act.

As indicated in Note

April 26, 2018,

the Company closed the PIPE Private Placement for aggregate gross procee

ds of

$56,855,000

th certain qualified institutional buyers and other accredited investors. The PIPE Private Placement included the issuance of the PIPE Shares and the PIPE Warrants. The PIPE Shares and PIPE Warrants were issued in reliance upon the exemption from registration provided by Section

(a)(

) of the Securities Act.

As indicated in Notes

and

May 2, 2018,

the Company and Carlyle entered into the Exchange pursuant to which Carlyle exchanged

$50.0

million in principal amount of the Convertible Senior Notes for the Carlyle Warrants. The Carlyle Warrants were issued in reliance upon the exemption from registration provided by Section

(a)(

) of the Securities Act.

Note 10 - Noncontrolling Interests in Subsidiaries

9 Months Ended

Sep. 30, 2018

Noncontrolling Interest Disclosure [Text Block]

10.	NONCONTROLLING INTERESTS IN SUBSIDIARIES

Noncontrolling interests

in the Company’s consolidated subsidiaries were as follows (in thousands):

	Noncontrolling Interests		September 30, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	27,024	$	12,087
Windcat Workboats		12.5%		2,311		2,608
Other		1.8%		292		280
			$	29,627	$	14,975

Falcon Global Holdings.

The Company formed FGH, a joint venture between the Company and MOI. The Company and MOI contributed certain liftboat vessels and other related assets to FGH and its designated subsidiaries and assumed certain operating liabilities and indebtedness associated with the liftboat vessels and related assets, including a previous joint venture (“Falcon Global International” or “FGI”) that owned and operated

two

liftboats. The transaction consolidates the

liftboat vessels operated by the Company and

six

liftboat vessels previously operated by MOI.

The total capital contributed to FGH was approximately

$112.5

million of which,

$43.3

million was transferred from FGI and

$18.8

million was contributed by MOI

and recorded at fair value, with the remaining capital contributed by the Company. As a result of the transaction, the noncontrolling interest in the joint venture held by MOI is

28.0%.

During the

nine

months e

nded

September 30, 2018,

the net loss of Falcon Global Holdings was

$14.2

million, of which

$4.0

million was attributable to noncontrolling interests.

Windcat Workboats.

indcat Workboats owns and operates the Company’s wind farm utility vessels that are primarily used to move personnel and supplies in the major offshore wind markets of Europe. As of

September 30, 2018,

the net assets of Windcat Workboats were

$18.5

million. During the

nine

months ended

September 30, 2018,

the net loss of Windcat Workboats was

$2.0

million, of which

$0.2

million was attributable to noncontrolling interests.

Note 11 - Commitments and Contingencies	9 Months Ended
Note 11 - Commitments and Contingencies	Sep. 30, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. COMMITMENTS AND CONTINGENCIES As of September 30, 2018, the Company’s unfunded capital commitments were $34.5 million for two fast support vessels, three supply vessels, two wind farm utility vessels and a conversion of one supply vessel to standby safety vessel. Of the amount of unfunded capital commitments, $2.7 million is payable during the remainder of 2018, $17.3 million is payable during 2019 and $14.5 million is payable during 2020. The Company has indefinitely deferred an additional $20.8 million of orders with respect to two fast support vessels for which the Company had previously reported unfunded capital commitments. The delivery dates and payment of certain costs (originally scheduled for payment in 2018, 2019 and 2020 ) for such vessels are uncertain as the Company, at its option, may defer their construction for an indefinite period of time. The Company's remaining commitment related to capital commitments for SEACOSCO is approximately $5.3 million. As of September 30, 2018, the Company has guaranteed certain performance contracts of one of its subsidiaries by setting aside £0.9 million from its available borrowing under an unsecured line of credit. If the contract were not fulfilled, the line of credit would be drawn to fund the guarantee. As of September 30, 2018, SEA COR Holdings has guaranteed $46.1 million on behalf of the Company for various obligations including: letter of credit obligations, performance obligations under sale-leaseback arrangements and invoiced amounts for funding deficits under the MNOPF. Pursuant to a Distribution Agreement with SEACOR Holdings, SEACOR Holdings charges the Company a fee of 0.5% on outstanding guaranteed amounts, which declines as the obligations are settled by the Company. In the normal course of its business, the Company becomes involved in various other litigation matters including, among other things, claims by third parties for alleged property damages and personal injuries. Management has used estimates in determining the Company’s potential exposure to these matters and has recorded reserves in its financial statements related thereto where appropriate. It is possible that a change in the Company’s estimates of that exposure could occur, but the Company does not expect such changes in estimated costs would have a material effect on the Company’s consolidated financial position, results of operations or cash flows.

Note 12 - Multi-employer Pension Plans	9 Months Ended
Note 12 - Multi-employer Pension Plans	Sep. 30, 2018
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	12. MULTI-EMPLOYER PENSION PLANS Merchant Navy Ratings Pension Fund (“MNRPF”). The cumulative funding deficits of the MNRPF are being recovered by additional annual contributions from current employers that are subject to adjustment following the results of tri-annual actuarial valuations. Based on an actuarial valuation as of March 2017, the cumulative funding deficit of the MNRPF was $291.9 million ( £221.0 million). On July 20, 2018, the Company was notified of additional contributions due and recognized in the second quarter of 2018 payroll related expenses of $1.19 million ( £0.9 million) for its allocated share of the cumulative funding deficit including portions deemed uncollectible due to the non-existence or liquidation of certain former employers. These additional contributions are payable in four annual installments, which began in October 2018. Depending upon the results of future actuarial valuations, it is possible that the plan could experience further funding deficits that will require the Company to recognize payroll related operating expenses for those periods.

Note 13 - Share Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

13.

SHARE BASED COMPENSATION

Transactions in connection with the Company's

2017

Equity Incentive Plan during the

nine

months ended

September 30, 2018

were as follows:

Director stock awards granted			19,285

Restricted stock awards granted			120,600

Stock Options Activities:
Outstanding as of December 31, 2017			613,700
Granted			183,491
Exercised			65,000
Outstanding as of September 30, 2018			732,191

Shares Available for future grants as of September 30, 2018			1,232,924

Note 14 - Stock Repurchases	9 Months Ended
Note 14 - Stock Repurchases	Sep. 30, 2018
Notes to Financial Statements
Treasury Stock [Text Block]	14. STOCK REPURCHASES For the nine months ended September 30, 2018, the Company acquired for treasury 3,664 shares of Common Stock for an aggregate purchase price of $83,922 from its employees to cover their tax withholding obligations upon the lapsing of restrictions on share awards. These shares were purchased in accordance with the terms of the Company's 2017 Equity Incentive Plan and not pursuant to the repurchase authorizations granted by the Company's Board of Directors. On May 24, 2018, in connection with the net settlement of the Carlyle Warrant Exercise, the Company acquired for treasury 108 shares of Common Stock for an aggregate purchase price of $2,562 from Carlyle to cover the $0.01 exercise price of the Carlyle Warrants. (See Note 8 ).

Note 15 - Segment Information

9 Months Ended

Sep. 30, 2018

Segment Reporting Disclosure [Text Block]

SEGMENT INFORMATION

The Company’s segment presentation and basis of measurement of segment profit or loss are as previously described in the Company’s Annual Report on Form

-K for the year ended

December 31, 2017.

The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments (in thousands).

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Three Months Ended September 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	12,476		$	9,315		$	8,156		$	17,604		$	4,287		$	7,323
Fleet Utilization		30	%		82	%		76	%		80	%		85	%		68	%
Fleet Available Days		3,433			1,475			2,024			531			5,154			12,617
Operating Revenues:
Time charter	$	12,800		$	11,201		$	12,590		$	7,479		$	18,832		$	62,902
Bareboat charter		—			—			—			1,168			—			1,168
Other marine services		2,722			1,777			(83	)		416			1,353			6,185
		15,522			12,978			12,507			9,063			20,185			70,255
Direct Costs and Expenses:
Operating:
Personnel		4,853			4,486			4,361			1,662			9,659			25,021
Repairs and maintenance		1,801			2,438			2,091			312			2,566			9,208
Drydocking		375			1,201			352			103			2,791			4,822
Insurance and loss reserves		612			323			385			163			374			1,857
Fuel, lubes and supplies		1,120			1,081			892			427			1,170			4,690
Other		154			1,103			952			350			441			3,000
		8,915			10,632			9,033			3,017			17,001			48,598
Direct Vessel Profit	$	6,607		$	2,346		$	3,474		$	6,046		$	3,184			21,657
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,853		$	960		$	—		$	—		$	12			2,825
Administrative and general																	12,234
Depreciation and amortization	$	5,227		$	2,381		$	4,207		$	2,521		$	3,006			17,342
																	32,401
Gains on Asset Dispositions and Impairments																	586
Operating Loss																$	(10,158	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Nine Months Ended September 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,832		$	9,425		$	8,156		$	17,807		$	4,721		$	7,229
Fleet Utilization		23	%		86	%		75	%		65	%		77	%		61	%
Fleet Available Days		11,193			4,066			6,161			1,166			15,159			37,746
Operating Revenues:
Time charter	$	27,834		$	33,117		$	37,555		$	13,409		$	54,955		$	166,870
Bareboat charter		—			—			—			3,467			—			3,467
Other marine services		6,053			3,414			(1,005	)		1,371			2,507			12,340
		33,887			36,531			36,550			18,247			57,462			182,677
Direct Costs and Expenses:
Operating:
Personnel		13,481			12,873			12,452			3,257			29,367			71,430
Repairs and maintenance		4,024			5,457			8,095			649			7,126			25,351
Drydocking		1,810			2,113			413			114			5,741			10,191
Insurance and loss reserves		1,948			789			982			399			863			4,981
Fuel, lubes and supplies		2,513			2,650			2,848			841			3,505			12,357
Other		208			3,541			2,996			898			973			8,616
		23,984			27,423			27,786			6,158			47,575			132,926
Direct Vessel Profit	$	9,903		$	9,108		$	8,764		$	12,089		$	9,887			49,751
Other Costs and Expenses:
Operating:
Leased-in equipment	$	5,571		$	2,885		$	—		$	—		$	34			8,490
Administrative and general																	40,573
Depreciation and amortization	$	17,677		$	8,112		$	14,608		$	6,020		$	8,843			55,260
																	104,323
Losses on Asset Dispositions and Impairment																	(1,002	)
Operating Loss																$	(55,574	)

As of September 30, 2018
Property and Equipment:
Historical cost	$	479,303		$	186,729		$	310,110		$	102,776		$	200,082		$	1,279,000
Accumulated depreciation		(242,364	)		(53,498	)		(81,121	)		(47,374	)		(144,395	)		(568,752	)
	$	236,939		$	133,231		$	228,989		$	55,402		$	55,687		$	710,248

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Three Months Ended September 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	7,212		$	10,611		$	7,138		$	16,060		$	4,390		$	6,006
Fleet Utilization		16	%		71	%		61	%		49	%		90	%		60	%
Fleet Available Days		3,859			1,283			2,194			184			5,060			12,580
Operating Revenues:
Time charter	$	4,587		$	9,700		$	9,490		$	1,439		$	20,051		$	45,267
Bareboat charter		—			—			—			1,168			—			1,168
Other marine services		1,116			(310	)		(341	)		159			754			1,378
		5,703			9,390			9,149			2,766			20,805			47,813
Direct Costs and Expenses:
Operating:
Personnel		4,455			3,588			4,731			326			9,079			22,179
Repairs and maintenance		1,289			1,324			2,309			110			2,378			7,410
Drydocking		1,109			311			(102	)		—			961			2,279
Insurance and loss reserves		598			157			363			75			203			1,396
Fuel, lubes and supplies		249			693			1,115			33			790			2,880
Other		123			704			1,192			69			190			2,278
		7,823			6,777			9,608			613			13,601			38,422
Direct Vessel (Loss) Profit	$	(2,120	)	$	2,613		$	(459	)	$	2,153		$	7,204			9,391
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,870		$	966		$	—		$	—		$	—			2,836
Administrative and general																	10,318
Depreciation and amortization	$	5,224		$	2,456		$	4,320		$	1,025		$	2,597			15,622
																	28,776
Losses on Asset Dispositions and Impairments																	(9,744	)
Operating Loss																$	(29,129	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Nine Months Ended September 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	8,661		$	10,192		$	6,916		$	16,060		$	4,328		$	5,806
Fleet Utilization		12	%		67	%		55	%		24	%		84	%		54	%
Fleet Available Days		11,920			3,425			5,970			379			15,015			36,709
Operating Revenues:
Time charter	$	12,471			23,333		$	22,728		$	1,439		$	54,829		$	114,800
Bareboat charter		—			—			—			3,467			—			3,467
Other marine services		3,140			97			645			396			1,895			6,173
		15,611			23,430			23,373			5,302			56,724			124,440
Direct Costs and Expenses:
Operating:
Personnel		11,768			9,624			12,001			487			25,667			59,547
Repairs and maintenance		2,963			5,102			6,832			230			6,303			21,430
Drydocking		1,992			2,051			414			—			3,140			7,597
Insurance and loss reserves		2,608			696			1,062			86			629			5,081
Fuel, lubes and supplies		1,104			1,956			2,547			60			2,745			8,412
Other		246			2,221			3,718			73			677			6,935
		20,681			21,650			26,574			936			39,161			109,002
Direct Vessel (Loss) Profit	$	(5,070	)	$	1,780		$	(3,201	)	$	4,366		$	17,563			15,438
Other Costs and Expenses:
Operating:
Leased-in equipment	$	6,286		$	2,905		$	862		$	—		$	64			10,117
Administrative and general																	43,849
Depreciation and amortization	$	16,573		$	6,105		$	10,826		$	2,474		$	6,780			42,758
																	96,724
Losses on Asset Dispositions and Impairment																	(11,243	)
Operating Loss																$	(92,529	)

As of September 30, 2017
Property and Equipment:
Historical cost	$	429,500		$	189,845		$	328,263		$	78,976		$	177,825		$	1,204,409
Accumulated depreciation		(237,210	)		(54,052	)		(93,535	)		(42,590	)		(131,532	)		(558,919	)
	$	192,290		$	135,793		$	234,728		$	36,386		$	46,293		$	645,490

The Company’s investments in

50%

or less owned companies, which are accounted for under the equity method, also contribute to its consolidated results of operations. As of

September 30, 2018,

the Company’s investments, at equity and advances to

50%

or less owned companies in MexMar and its other

50%

or less owned companies were

$63.8

million and

$56.5

million, respectively. Equity in (losses) earnings of

50%

or less owned companies, net of tax for the

nine

months ended

September 30

were as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
MexMar	$	137		$	793		$	2,644		$	3,382
Other		(1,164	)		(8,099	)		(4,184	)		(8,679	)
	$	(1,027	)	$	(7,306	)	$	(1,540	)	$	(5,297	)

Note 16 - Subsequent Event	9 Months Ended
Note 16 - Subsequent Event	Sep. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	16. SUBSEQUENT EVENT In October 2018, the Company entered into interest rate swap agreements for the purpose of providing protection against increases in interest rates, which might lead to higher interest costs on the Company's debt that bear interest at a floating rate. These agreements hedged 50% of the $11.0 million of debt incurred by Seacor 88 and Seacor 888 and 50% of the $130.0 million syndicated credit facility incurred by SMFH. The Company is currently evaluating the swap agreements for hedge accounting effectiveness. Subsequent to September 30, 2018, the Company sold three fast support vessels and two liftboats for gross proceeds of $8.2 million and a net gain of $5.1 million. $7.0 million of such gross proceeds were used for the repayment of existing indebtedness.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

not

necessarily indicative of operating results for the full year or any future periods.

-K for the year ended

December

31,

2017.

Unless the context otherwise indicates, any reference in this Quarterly Report on Form

-Q to the “Company” refers to SEACOR Marine Holdings Inc. and its consolidated subsidiaries and any reference in this Quarterly Report on Form

-Q to “SEACOR Marine” refers to SEACOR Marine Holdings Inc. without its consolidated subsidiaries. Capitalized terms used and

not

specifically defined herein have the same meaning given those terms in the Company's Annual Report on Form

-K for the year ended December

31,

2017.

June 1, 2017,

SEACOR Holdings completed a spin-off of SEACOR Marine by way of a pro rata dividend of SEACOR Marine’s common stock, par value

$0.01

per share (“Common Stock”), all of which was then held by SEACOR Holdings, to SEACOR Holdings’ shareholders of record as of

May 22, 2017 (

two

Recently Adopted Accounting Standards [Policy Text Block]

Recently Adopted Accounting Standards.

May 2014,

the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”)

2014

09,

“

Revenue from Contracts with Customers (Topic

606

)

January 1, 2018

not

addressed in the new standard. As a result, the adoption of the standard did

not

have a material effect on the Company's financial position, results of operations or cash flows, but did result in increased disclosures related to revenue recognition policies.

November 2016,

the FASB issued ASU

2016

18,

“

Statement of Cash Flows (Topic

230

) – Restricted Cash

”

January 1, 2018.

Retrospective presentation was required. The adoption of the standard did

not

have a material effect on the Company's financial position, results of operations or cash flows. In accordance with ASU

2016

18,

the Company has included restricted cash as part of the beginning-of-period and end-of-period cash balances on the condensed consolidated statement of cash flows.

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition.

Lease Revenues.

on (see Note

Revenues from Customers.

one

three

rred (see Note

Revenue that does

not

meet these criteria is deferred until the criteria is met and are considered contract liabili

ties. Contract liabilities, i

ncluded in other current liabilities in the accompanying condensed consolidated balance sheets, for the

nine

months ended

September 30

were as follows (in thousands):

	201 8			201 7
Balance at beginning of period	$	10,104		$	6,953
Revenues deferred during the period		2,756			3,147
Revenues recognized during the period		(3,191	)		—
Balance at end of period	$	9,669		$	10,100

As of

September

30, 2018,

contract liabiliti

es of

$6.8

August 17, 2012,

the customer filed a voluntary petition for Chapter

bankruptcy. The Company is vigorously defending its interest in connection with the bankruptcy filing; however, payments received under the Conveyance subsequent to

May 19, 2012

are subject to creditors’ claims in bankruptcy court.

The Company will recognize revenues when reasonably assured of a judgment in its favor. All costs and expenses related to these charters were recognized as incurred.

As of

September

30, 2018,

contract liabilities of

$2.5

million re

lated to the time charter of an offshore support vessel to a customer for which collection was

not

reasonably assured. The Company will recognize revenues when collected or when collection is reasonably assured. All costs and expenses related to this charter were recognized as incurred.

The remaining balance of

$0.4

million as of

September 30, 2018

is comprised of contract liabilities to

two

customers for which collection is

not

reasonably assured.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment.

not

justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company

may

As of

September

30, 2018,

the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore Support Vessels:
Wind farm utility vessels			10
All other offshore support vessels (excluding wind farm utility)			20

Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. During the

nine

months ended

September 30, 2018,

capitalized interest total

$1.6

million.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Impairment of Long-Lived Assets.

The Company performs an impairment analysis of long-lived assets used in operations, including intangible assets, when indicators of impairment are present. These indicators

may

not

nine

months ended

September 30, 2018,

the Company recognized

$3.0

million of imp

airment charges primarily related to

four

anchor handling towing supply vessels removed from service and adjusted to scrap value.

Equity and Cost Method Investments, Policy [Policy Text Block]

Impairment of

50%

or Less Owned Companies.

Investments in

50%

or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the

may

nine

months ended

September 30, 2018,

the Company recognized impairment charges of

$1.2

million related to

one

of its

50%

or less owned companies which the Company believes will be unable to meet all of its liabilities.

Income Tax, Policy [Policy Text Block]

Income Taxes.

During the

nine

months ended

September 30, 2018,

the Company's effective income tax rate of

15.5

was primarily due to taxes provided on income attributable to noncontrolling interests, foreign sourced income

not

subject to U.S. income taxes, foreign taxes

not

creditable against U.S. income taxes, a return-to-provision adjustment and a reversal of an unrecognized tax benefit. During the

nine

months ended

September 30, 2017,

the Company’s effective income tax rate of

27.4%

was primarily due to losses of foreign subsidiaries

not

benefited, non-deductible expenses associated with the Company's participation in SEACOR Holdings' share award plans and non-deductible Spin-off related expenses reimbursed to SEACOR Holdings.

Deferred Gains [Policy Text Block]

Deferred Gains.

he Company has sold certain equipment to its

50%

or less owned companies, entered into vessel sale-leaseback transactions with finance companies and provided seller financing on sales of its equipment to

third

parties and its

50%

nine

months ended

September 30

was as follows (in thousands):

	2018			2017
Balance at beginning of period	$	25,006		$	33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense		(6,053	)		(6,109	)
Other adjustments		(416	)		(364	)
Balance at end of period	$	18,537		$	27,437

Comprehensive Income, Policy [Policy Text Block]

Accumulated Other Comprehensive Income (Loss).

The components of accumulated other comprehensive loss were as follows (in thousands):

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		(1,358	)		(48	)		(1,406	)		(48	)		(4	)	$	(1,458	)
Income tax expense		—			(46	)		(46	)		—			—			(46	)
Nine months Ended September 30, 2018	$	(14,553	)	$	608		$	(13,945	)	$	(1,405	)	$	(3	)	$	(1,504	)

Earnings Per Share, Policy [Policy Text Block]

Loss Per Share.

asic loss per common share of the Company is computed based on the weighted average number of common shares and warrants to purchase common shares at an exercise price of

$0.01

not

For the

nine

months ended

September 30, 2018

and

2017,

diluted earnings per common share of the Company excluded

2,183,708

and

4,070,500

common shares, respectively, issuable pursuant to the Company’s Convertible Senior Notes (see Note

) as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the

nine

months ended

September 30, 2018,

diluted loss per common share of the Company excluded

196,338

shares of restricted stock and

732,191

shares of stock issuable upon exercise of outstanding stock options as the effect of their inclusion in the computation would be anti-dilutive.

While calculating the weighted average basic and diluted number of common shares and warrants issued and outstanding for the quarter ending

September 30, 2018,

the Company discovered that it had understated the weighted average basic and diluted common shares and warrants issued and outstanding for both the

three

months and

six

months ended

June 30, 2018.

As a result of this error, the Company also overstated the basic and diluted loss per common share and warrant for the same

two

periods. The correct weighted average basic and diluted common shares and warrants for the

three

months ended

June 30, 2018

was

21,035,214,

an increase of

1,056,698

versus the number previously reported. This increase results in a corrected basic and diluted loss per common share and warrant of

$1.19

versus

$1.25

previously reported. The correct weighted average basic and diluted common shares and warrants for the

six

months ended

June 30, 2018

was

19,312,923,

an increase of

1,345,681

versus the number previously reported. This increase results in a corrected basic and diluted loss per common share and warrant of

$2.79

versus

$3.00

previously reported. The net loss attributable to the Company for the

three

and

six

months ended

June 30, 2018,

as well as all prior year numbers were

not

impacted.

Upon assessing the error from both a quantitative and qualitative perspective, the Company concluded the error was

not

material to the

June 30, 2018

financial statements and has

impact on the

September 30, 2018

financial statements presented herein.

New Accounting Pronouncements, Policy [Policy Text Block]

New Accounting Pronouncements.

February 25, 2016,

January 1, 2019

$40

million to

$75

million in new right-of-use assets and corresponding lease liabilities for certain of its equipment, office and land leases. The Company's estimates are preliminary and are based on its cu

may

change and those changes

may

be material.

February 2018,

December 2017.

The standard is effective for interim and annual periods beginning after

December 15, 2018.

The Company does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

June 2018,

December 15, 2018.

The Company does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

August 2018,

December 15, 2019.

The Company is evaluating the provisions of the standard, but does

not

expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

Note 1 - Basis of Presentation and Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

	201 8			201 7
Balance at beginning of period	$	10,104		$	6,953
Revenues deferred during the period		2,756			3,147
Revenues recognized during the period		(3,191	)		—
Balance at end of period	$	9,669		$	10,100

Property, Plant and Equipment [Table Text Block]

Offshore Support Vessels:
Wind farm utility vessels			10
All other offshore support vessels (excluding wind farm utility)			20

Schedule of Deferred Gain [Table Text Block]

	2018			2017
Balance at beginning of period	$	25,006		$	33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense		(6,053	)		(6,109	)
Other adjustments		(416	)		(364	)
Balance at end of period	$	18,537		$	27,437

Comprehensive Income (Loss) [Table Text Block]

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		(1,358	)		(48	)		(1,406	)		(48	)		(4	)	$	(1,458	)
Income tax expense		—			(46	)		(46	)		—			—			(46	)
Nine months Ended September 30, 2018	$	(14,553	)	$	608		$	(13,945	)	$	(1,405	)	$	(3	)	$	(1,504	)

Note 5 - Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Statutory rate	21.0	%
Noncontrolling interests	(1.0	%)
Foreign earnings not subject to U.S. income tax	(3.2	)%
Foreign taxes not creditable against U.S. income tax	(2.9	)%
Unrecognized tax benefit	4.5	%
Return to provision adjustment	(4.0	)%
Other	1.1	%
	15.5	%

Note 6 - Derivative Instruments and Hedging Strategies (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	Derivative Asset (1)		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	—	$	10	(2)
		—		10
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		17,928
Interest rate swap agreements		1,565		25	(2)
	$	1,565	$	17,963

Derivatives Not Designated as Hedging Instruments [Table Text Block]

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(11,096	)	$	13,119
Forward currency exchange, option and future contracts		—			(78	)
Interest rate swap agreements		1,299			(321	)
	$	(9,797	)	$	12,720

Note 7 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2		Level 3
ASSETS
Derivative instruments (included in other receivables)	$	—	$	1,565	$	—
Construction reserve funds		35,596		—		—
LIABILITIES
Derivative instruments		—		35		17,928

Fair Value, by Balance Sheet Grouping [Table Text Block]

			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
ASSETS
Cash, cash equivalents and restricted cash	$	104,519	$	104,519	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		415,164		—		416,888		—

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

	Level 1		Level 2		Level 3
ASSETS
Property and equipment:
Anchor handling towing supply	$	—	$	2,000	$	—
Liftboats		—		—		134,775

Note 8 - Warrants (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Weighted Average Exercise Price		Number of Warrants
Balance as of December 31, 2017		—		—
Warrants issued - January 1 - September 30, 2018	$	0.01		2,560,956
Warrants exercised - January 1 - September 30, 2018	$	0.01		(289,550	)
Balance as of September 30, 2018	$	0.01		2,271,406

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Note 10 - Noncontrolling Interests in Subsidiaries (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Noncontrolling Interest [Table Text Block]

	Noncontrolling Interests		September 30, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	27,024	$	12,087
Windcat Workboats		12.5%		2,311		2,608
Other		1.8%		292		280
			$	29,627	$	14,975

Note 13 - Share Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Share-based Compensation, Activity [Table Text Block]

Director stock awards granted			19,285

Restricted stock awards granted			120,600

Stock Options Activities:
Outstanding as of December 31, 2017			613,700
Granted			183,491
Exercised			65,000
Outstanding as of September 30, 2018			732,191

Shares Available for future grants as of September 30, 2018			1,232,924

Note 15 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Three Months Ended September 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	12,476		$	9,315		$	8,156		$	17,604		$	4,287		$	7,323
Fleet Utilization		30	%		82	%		76	%		80	%		85	%		68	%
Fleet Available Days		3,433			1,475			2,024			531			5,154			12,617
Operating Revenues:
Time charter	$	12,800		$	11,201		$	12,590		$	7,479		$	18,832		$	62,902
Bareboat charter		—			—			—			1,168			—			1,168
Other marine services		2,722			1,777			(83	)		416			1,353			6,185
		15,522			12,978			12,507			9,063			20,185			70,255
Direct Costs and Expenses:
Operating:
Personnel		4,853			4,486			4,361			1,662			9,659			25,021
Repairs and maintenance		1,801			2,438			2,091			312			2,566			9,208
Drydocking		375			1,201			352			103			2,791			4,822
Insurance and loss reserves		612			323			385			163			374			1,857
Fuel, lubes and supplies		1,120			1,081			892			427			1,170			4,690
Other		154			1,103			952			350			441			3,000
		8,915			10,632			9,033			3,017			17,001			48,598
Direct Vessel Profit	$	6,607		$	2,346		$	3,474		$	6,046		$	3,184			21,657
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,853		$	960		$	—		$	—		$	12			2,825
Administrative and general																	12,234
Depreciation and amortization	$	5,227		$	2,381		$	4,207		$	2,521		$	3,006			17,342
																	32,401
Gains on Asset Dispositions and Impairments																	586
Operating Loss																$	(10,158	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Nine Months Ended September 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,832		$	9,425		$	8,156		$	17,807		$	4,721		$	7,229
Fleet Utilization		23	%		86	%		75	%		65	%		77	%		61	%
Fleet Available Days		11,193			4,066			6,161			1,166			15,159			37,746
Operating Revenues:
Time charter	$	27,834		$	33,117		$	37,555		$	13,409		$	54,955		$	166,870
Bareboat charter		—			—			—			3,467			—			3,467
Other marine services		6,053			3,414			(1,005	)		1,371			2,507			12,340
		33,887			36,531			36,550			18,247			57,462			182,677
Direct Costs and Expenses:
Operating:
Personnel		13,481			12,873			12,452			3,257			29,367			71,430
Repairs and maintenance		4,024			5,457			8,095			649			7,126			25,351
Drydocking		1,810			2,113			413			114			5,741			10,191
Insurance and loss reserves		1,948			789			982			399			863			4,981
Fuel, lubes and supplies		2,513			2,650			2,848			841			3,505			12,357
Other		208			3,541			2,996			898			973			8,616
		23,984			27,423			27,786			6,158			47,575			132,926
Direct Vessel Profit	$	9,903		$	9,108		$	8,764		$	12,089		$	9,887			49,751
Other Costs and Expenses:
Operating:
Leased-in equipment	$	5,571		$	2,885		$	—		$	—		$	34			8,490
Administrative and general																	40,573
Depreciation and amortization	$	17,677		$	8,112		$	14,608		$	6,020		$	8,843			55,260
																	104,323
Losses on Asset Dispositions and Impairment																	(1,002	)
Operating Loss																$	(55,574	)

As of September 30, 2018
Property and Equipment:
Historical cost	$	479,303		$	186,729		$	310,110		$	102,776		$	200,082		$	1,279,000
Accumulated depreciation		(242,364	)		(53,498	)		(81,121	)		(47,374	)		(144,395	)		(568,752	)
	$	236,939		$	133,231		$	228,989		$	55,402		$	55,687		$	710,248

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Three Months Ended September 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	7,212		$	10,611		$	7,138		$	16,060		$	4,390		$	6,006
Fleet Utilization		16	%		71	%		61	%		49	%		90	%		60	%
Fleet Available Days		3,859			1,283			2,194			184			5,060			12,580
Operating Revenues:
Time charter	$	4,587		$	9,700		$	9,490		$	1,439		$	20,051		$	45,267
Bareboat charter		—			—			—			1,168			—			1,168
Other marine services		1,116			(310	)		(341	)		159			754			1,378
		5,703			9,390			9,149			2,766			20,805			47,813
Direct Costs and Expenses:
Operating:
Personnel		4,455			3,588			4,731			326			9,079			22,179
Repairs and maintenance		1,289			1,324			2,309			110			2,378			7,410
Drydocking		1,109			311			(102	)		—			961			2,279
Insurance and loss reserves		598			157			363			75			203			1,396
Fuel, lubes and supplies		249			693			1,115			33			790			2,880
Other		123			704			1,192			69			190			2,278
		7,823			6,777			9,608			613			13,601			38,422
Direct Vessel (Loss) Profit	$	(2,120	)	$	2,613		$	(459	)	$	2,153		$	7,204			9,391
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,870		$	966		$	—		$	—		$	—			2,836
Administrative and general																	10,318
Depreciation and amortization	$	5,224		$	2,456		$	4,320		$	1,025		$	2,597			15,622
																	28,776
Losses on Asset Dispositions and Impairments																	(9,744	)
Operating Loss																$	(29,129	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Brazil, Mexico, Central and South America			Europe (primarily North Sea)			Total
For the Nine Months Ended September 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	8,661		$	10,192		$	6,916		$	16,060		$	4,328		$	5,806
Fleet Utilization		12	%		67	%		55	%		24	%		84	%		54	%
Fleet Available Days		11,920			3,425			5,970			379			15,015			36,709
Operating Revenues:
Time charter	$	12,471			23,333		$	22,728		$	1,439		$	54,829		$	114,800
Bareboat charter		—			—			—			3,467			—			3,467
Other marine services		3,140			97			645			396			1,895			6,173
		15,611			23,430			23,373			5,302			56,724			124,440
Direct Costs and Expenses:
Operating:
Personnel		11,768			9,624			12,001			487			25,667			59,547
Repairs and maintenance		2,963			5,102			6,832			230			6,303			21,430
Drydocking		1,992			2,051			414			—			3,140			7,597
Insurance and loss reserves		2,608			696			1,062			86			629			5,081
Fuel, lubes and supplies		1,104			1,956			2,547			60			2,745			8,412
Other		246			2,221			3,718			73			677			6,935
		20,681			21,650			26,574			936			39,161			109,002
Direct Vessel (Loss) Profit	$	(5,070	)	$	1,780		$	(3,201	)	$	4,366		$	17,563			15,438
Other Costs and Expenses:
Operating:
Leased-in equipment	$	6,286		$	2,905		$	862		$	—		$	64			10,117
Administrative and general																	43,849
Depreciation and amortization	$	16,573		$	6,105		$	10,826		$	2,474		$	6,780			42,758
																	96,724
Losses on Asset Dispositions and Impairment																	(11,243	)
Operating Loss																$	(92,529	)

As of September 30, 2017
Property and Equipment:
Historical cost	$	429,500		$	189,845		$	328,263		$	78,976		$	177,825		$	1,204,409
Accumulated depreciation		(237,210	)		(54,052	)		(93,535	)		(42,590	)		(131,532	)		(558,919	)
	$	192,290		$	135,793		$	234,728		$	36,386		$	46,293		$	645,490

Equity Method Investments [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
MexMar	$	137		$	793		$	2,644		$	3,382
Other		(1,164	)		(8,099	)		(4,184	)		(8,679	)
	$	(1,027	)	$	(7,306	)	$	(1,540	)	$	(5,297	)

Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2019	Dec. 31, 2017	Jun. 01, 2017	Dec. 31, 2016
Common Stock, Par or Stated Value Per Share			$ 0.01			$ 0.01	$ 0.01
Contract with Customer, Liability, Total			$ 9,669	$ 10,100		$ 10,104		$ 6,953
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total			1,600
Impairment of Long-Lived Assets Held-for-use			3,000
Equity Method Investment, Other than Temporary Impairment			$ 1,200
Effective Income Tax Rate Reconciliation, Percent, Total			15.50%	27.40%
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.01
Incremental Common Shares Attributable to Conversion of Debt Securities, Total			2,183,708	4,070,500
Weighted Average Number of Shares Outstanding, Basic and Diluted	21,035,214	19,312,923
Earnings Per Share, Basic and Diluted, Total	$ 1.19	$ 2.79
Scenario, Forecast [Member] \| Minimum [Member]
Operating Lease, Right-of-Use Asset					$ 40,000
Operating Lease, Liability, Total					40,000
Scenario, Forecast [Member] \| Maximum [Member]
Operating Lease, Right-of-Use Asset					75,000
Operating Lease, Liability, Total					$ 75,000
Previously Reported [Member]
Earnings Per Share, Basic and Diluted, Total	$ 1.25	$ 3
Restatement Adjustment [Member]
Weighted Average Number of Shares Outstanding, Basic and Diluted	1,056,698	1,345,681
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			196,338
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			732,191
Two Customers [Member]
Contract with Customer, Liability, Total			$ 400
Geographic Distribution, Domestic [Member]
Contract with Customer, Liability, Total			6,800
Geographic Distribution, Foreign [Member]
Contract with Customer, Liability, Total			$ 2,500

Note 1 - Basis of Presentation and Accounting Policies - Deferred Revenues (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Balance at beginning of period	$ 10,104	$ 6,953
Revenues deferred during the period	2,756	3,147
Revenues recognized during the period	(3,191)
Balance at end of period	$ 9,669	$ 10,100

Note 1 - Basis of Presentation and Accounting Policies - Property and Equipment Useful Life (Details)	9 Months Ended
	Sep. 30, 2018
Wind Farm Utility Vessel [Member]
Estimated useful life (Year)	10 years
Offshore Support Vessels [Member]
Estimated useful life (Year)	20 years

Note 1 - Basis of Presentation and Accounting Policies - Deferred Gain Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Balance at beginning of period	$ 25,006	$ 33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense	(6,053)	(6,109)
Other adjustments	(416)	(364)
Balance at end of period	$ 18,537	$ 27,437

Note 1 - Basis of Presentation and Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Balance			$ 523,166
	$ (824)	$ 1,605	(1,458)	$ 4,335
Income tax expense	(11)	(541)	(46)	(1,428)
Balance	564,888		564,888
Other comprehensive loss	(835)	$ 1,064	(1,504)	$ 2,907
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance			(13,195)
			(1,358)
Income tax expense
Balance	(14,553)		(14,553)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance			702
			(48)
Income tax expense			(46)
Balance	608		608
AOCI Attributable to Parent [Member]
Balance			(12,493)
			(1,406)
Income tax expense			(46)
Balance	(13,945)		(13,945)
Other comprehensive loss			(1,452)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]
Balance			(1,357)
			(48)
Income tax expense
Balance	(1,405)		(1,405)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Balance			1
			(4)
Income tax expense
Balance	$ (3)		$ (3)

Note 2 - Equipment Acquisitions and Dispositions (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Payments to Acquire Property, Plant, and Equipment, Including Fair Value Hedges	$ 44.6
Proceeds from Sale of Property, Plant, and Equipment, Including Deposits	4.0
Proceeds from Sale of Property, Plant, and Equipment, Excluding Deposits for Future Vessel Sales	3.9
Proceeds from Deposits	0.1
Gain (Loss) on Disposition of Property Plant Equipment, Total	2.0
Increase (Decrease) in Customer Deposits	$ 1.4
Wind Farm Utility Vessel [Member]
Number of Equipment Acquired	2
Number of Equipment Sold	1
Supply Vessels [Member]
Number of Equipment Acquired	2
Liftboats [Member]
Number of Equipment Acquired	6
Anchor Handling Towing Supply [Member]
Number of Equipment Acquired	2
Number of Equipment Sold	1
Fast Support Vessels Previously Retired [Member]
Number of Equipment Sold	1
Supply Vessel Previously Retired [Member]
Number of Equipment Sold	2
Standby Safety Vessels [Member]
Number of Equipment Sold	2
Fast Support Vessels [Member]
Number of Equipment Sold	3

Note 3 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) $ in Thousands				9 Months Ended
	Sep. 28, 2018 USD ($)	Sep. 13, 2018 USD ($)	Jan. 17, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 27, 2018 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total				$ 37,763	$ 52,353
Unrecorded Unconditional Purchase Obligation, Total				34,500
Equity Method Investment, Other than Temporary Impairment				1,200
Proceeds from Divestiture of Interest in Joint Venture				8,017
Guarantor Obligations, Maximum Exposure, Undiscounted				46,100
Grant DIS [Member]
Capital Call				500
SeaCosco Offshore LLC [Member]
Number of Equipment Operated			8
Payments to Acquire Property, Plant, and Equipment, Total			$ 161,100
Equity Method Investment, Ownership Percentage			50.00%
Partners' Capital Account, Contributions				27,000
Unrecorded Unconditional Purchase Obligation, Total				5,300
SEACOR Holdings [Member]
Equity Method Investment, Other than Temporary Impairment				$ 1,200
SEACOR Marlin LLC [Member]
Equity Method Investment, Ownership, Percent Sold		51.00%
Proceeds from Divestiture of Interest in Joint Venture		$ 8,000
Gain (Loss) on Disposition of Business		$ 400
OSV Partners [Member]
Secured Long-term Debt, Noncurrent						$ 27,300
Investment in Affiliates, Amount of Preferred Equity Offereing Participated	$ 5,000
Payments to Acquire Interest in Subsidiaries and Affiliates, Total	1,100
Commitment to Invest Additional Funds if Call By General Partner	1,100
Payments to Acquire Loans Receivable	2,100
OSV Partners [Member] \| General Partner [Member]
Partners' Capital Account, Contributions	$ 5,000
Other Offshore Marine Services Joint Ventures [Member]
Equity Method Investment, Ownership Percentage				50.00%
Guarantor Obligations, Maximum Exposure, Undiscounted				$ 500
Allocable Share of Uncalled Capital				$ 1,000

Note 4 - Long-term Debt (Details Textual) $ / shares in Units, € in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 26, 2018 USD ($)	May 02, 2018 USD ($) $ / shares shares	Feb. 08, 2018 USD ($)	Nov. 08, 2018 USD ($)	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2018 EUR (€)	Sep. 30, 2017 USD ($)	Oct. 31, 2018 USD ($)	Sep. 25, 2018 USD ($)	Jul. 05, 2018 USD ($)	Jun. 30, 2018	May 31, 2018 $ / shares	May 24, 2018 $ / shares	Dec. 31, 2017 $ / shares	Dec. 01, 2015 USD ($)
Debt Instrument, Interest Rate, Stated Percentage													2.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 0.01		$ 0.01
Repayments of Long-term Debt, Total							$ 38,053,000		$ 8,572,000
Debt Instrument, Increase (Decrease), Net, Total	$ 30,100,000						1,000,000
Gain (Loss) on Extinguishment of Debt, Total					$ (638,000)		(638,000)
Other Labor and Performance Guarantee					2,500,000		2,500,000
Long-term Debt Obligation [Member]
Letters of Credit Outstanding, Amount					5,800,000		5,800,000
Lease Obligation [Member]
Letters of Credit Outstanding, Amount					$ 300,000		$ 300,000
Subsequent Event [Member]
Repayments of Long-term Debt, Total				$ 7,000,000
Falcon Global Holdings [Member]
Noncontrolling Interest, Ownership Percentage by Parent					72.00%		72.00%
Falcon Global USA LLC [Member]
Payments for Debtor-in-possession Obligations			$ 15,000,000
Convertible Senior Notes Converted to Warrants [Member] \| Carlyle Group [Member]
Debt Instrument, Convertible, Conversion Ratio		37.73
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 0.01
Debt Conversion, Original Debt, Amount		$ 50,000,000
Debt Conversion, Converted Instrument, Shares Issued \| shares		1,886,792
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 26.50
Conversion Revolving Credit Facility from Windcat Workboats [Member]
Debt Conversion, Original Debt, Amount \| €								€ 6
Carlyle Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 0.01		$ 0.01							$ 0.01	$ 0.01
Warrants and Rights Outstanding, Term		25 years
Convertible Senior Notes 3.75% [Member]
Convertible Debt, Total		$ 125,000,000															$ 175,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.25%															3.75%
Debt Instrument, Convertible, Conversion Ratio							23.26	23.26
FGUSA Credit Facility [Member]
Debt Agreement, Maximum Borrowing Capacity			131,100,000
Debt Instrument, Unamortized Discount, Total			10,000,000
FGUSA Credit Facility [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			15,000,000
Debt Instrument, Interest Rate, Effective Percentage					6.63%		6.63%
Proceeds from Lines of Credit, Total							$ 15
FGUSA Credit Facility [Member] \| Term Loan [Member]
Long-term Debt, Total			$ 116,100,000
Euro Debt [Member]
Repayments of Long-term Debt, Total							7,500,000
Pound Sterling Debt [Member]
Proceeds from Issuance of Long-term Debt, Total							$ 8,500,000
Term Loan to Acquire Two Vessels [Member]
Debt Instrument, Interest Rate, Effective Percentage												5.90%
Debt Instrument, Face Amount												$ 11,000,000
Term Loan to Acquire Two Vessels [Member] \| Interest Rate Swap [Member] \| Subsequent Event [Member]
Derivative, Notional Amount										$ 5,500,000
Loan Facility With DNB Bank ASA [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 130,000,000
Debt Instrument, Interest Rate, Effective Percentage	6.1875%
Debt Instrument, Face Amount	$ 130,000,000
Debt Instrument, Periodic Payment, Principal	3,300,000
Loan Facility With DNB Bank ASA [Member] \| Interest Rate Swap [Member] \| Subsequent Event [Member]
Derivative, Notional Amount										$ 65,500,000
Other DNB Credit Facilities [Member]
Long-term Debt, Total											$ 99,900,000
Repayments of Lines of Credit	101,300,000
Interest Payable											$ 1,400,000
Gain (Loss) on Extinguishment of Debt, Total	$ (600,000)

Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Operating Loss Carryforwards, Total		$ 3.9
Increase (Decrease) in Transition Tax Liability	$ 3.4

Note 5 - Income Taxes - Income Tax Rate Reconciliation (Details)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statutory rate	21.00%
Noncontrolling interests	(1.00%)
Foreign earnings not subject to U.S. income tax	(3.20%)
Foreign taxes not creditable against U.S. income tax	(2.90%)
Unrecognized tax benefit	4.50%
Return to provision adjustment	(4.00%)
Other	1.10%
	15.50%	27.40%

Note 6 - Derivative Instruments and Hedging Strategies (Details Textual)
€ in Millions, $ in Millions

Oct. 01, 2018

USD ($)

Sep. 30, 2018

USD ($)

Sep. 30, 2018

EUR (€)

Sep. 28, 2018

USD ($)

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]

Interest Rate Swap [Member] | OSV Partners [Member]

^[1]

Derivative, Number of Instruments Held, Total

Interest Rate Swap [Member] | OSV Partners [Member] | Minimum [Member]

$ 29.2

Interest Rate Swap [Member] | OSV Partners [Member] | Maximum [Member]

1.89%

Interest Rate Swap [Member] | Falcon Global [Member]

2.27%

2.06%

Interest Rate Swap [Member] | Falcon Global [Member] | Subsequent Event [Member]

$ 51.6

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]

$ 1.2

Derivative, Number of Instruments Held, Total

0.03%

$ 17.5

€ 15

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | MexMar [Member]

^[1]

Derivative, Number of Instruments Held, Total

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | MexMar [Member] | Minimum [Member]

$ 100.5

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | MexMar [Member] | Maximum [Member]

1.71%

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Sea-Cat Crewzer II [Member]

2.10%

1.52%

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Sea-Cat Crewzer II [Member] | Subsequent Event [Member]

$ 19.1

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Sea-Cat Crewzer [Member]

0.2

1.52%

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Sea-Cat Crewzer [Member] | Subsequent Event [Member]

$ 16.9

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]

$ 0.2

[1]	Included in other receivables in the accompanying condensed consolidated balance sheets.

Note 6 - Derivative Instruments and Hedging Strategies - Derivative Instruments (Details)
$ in Thousands

Sep. 30, 2018

USD ($)

^[1]

Not Designated as Hedging Instrument [Member]

1,565

^[1]

Conversion option liability on Convertible Senior Notes

17,963

17,928

Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]

^[1]

Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]

^[2]

1,565

^[1]

$ 25

[1]	Included in other receivables in the accompanying condensed consolidated balance sheets.
[2]	Included in other current liabilities in the accompanying condensed consolidated balance sheets.

Note 6 - Derivative Instruments and Hedging Strategies - Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Gains (losses) on derivative instruments	$ (9,797)	$ 12,720
Embedded Derivative Financial Instruments [Member]
Gains (losses) on derivative instruments	(11,096)	13,119
Foreign Exchange Option [Member]
Gains (losses) on derivative instruments		(78)
Interest Rate Swap [Member]
Gains (losses) on derivative instruments	$ 1,299	$ (321)

Note 7 - Fair Value Measurements (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018
Impairment of Long-Lived Assets Held-for-use	$ 3.0
Debt Instrument, Interest Rate, Stated Percentage		2.00%
Minimum [Member] \| Economic Obsolesence Factor [Member]
Property and Equipment, Measurement Input	0.45
Maximum [Member] \| Economic Obsolesence Factor [Member]
Property and Equipment, Measurement Input	0.5
Liftboats [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	25 years
Liftboats [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years

Note 7 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Sep. 30, 2018 USD ($)
Fair Value, Inputs, Level 1 [Member]
Derivative assets
Construction reserve funds	35,596
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]
Derivative assets	1,565
Construction reserve funds
Derivative liabilities	35
Fair Value, Inputs, Level 3 [Member]
Derivative assets
Construction reserve funds
Derivative liabilities	$ 17,928

Note 7 - Fair Value Measurements - Estimated Fair Value (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Reported Value Measurement [Member]
Cash, cash equivalents and restricted cash	$ 104,519
Investments, at cost, in 50% or less owned companies (included in other assets)	132
Long-term debt, including current portion	415,164
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash, cash equivalents and restricted cash	104,519
Long-term debt, including current portion
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash, cash equivalents and restricted cash
Investments, at cost, in 50% or less owned companies (included in other assets)
Long-term debt, including current portion	416,888
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash, cash equivalents and restricted cash
Investments, at cost, in 50% or less owned companies (included in other assets)
Long-term debt, including current portion

Note 7 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Fair Value, Inputs, Level 1 [Member] \| Anchor Handling Towing Supply [Member]
Property and equipment
Fair Value, Inputs, Level 1 [Member] \| Liftboats [Member]
Property and equipment
Fair Value, Inputs, Level 2 [Member] \| Anchor Handling Towing Supply [Member]
Property and equipment	2,000
Fair Value, Inputs, Level 2 [Member] \| Liftboats [Member]
Property and equipment
Fair Value, Inputs, Level 3 [Member] \| Anchor Handling Towing Supply [Member]
Property and equipment
Fair Value, Inputs, Level 3 [Member] \| Liftboats [Member]
Property and equipment	$ 134,775

Note 8 - Warrants (Details Textual) - USD ($)					9 Months Ended
Note 8 - Warrants (Details Textual) - USD ($)	Jun. 08, 2018	May 31, 2018	May 02, 2018	Apr. 26, 2018	Sep. 30, 2018	May 24, 2018	Dec. 31, 2017
Stock Issued During Period, Value, New Issues					$ 42,996,000
Class of Warrant or Right, Outstanding					2,271,406
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.01
Class of Warrant or Right, Exercised During Period					289,550
Class of Warrant or Right, Exercised During Period, Exercise Price					$ 0.01
Carlyle Group [Member] \| Convertible Senior Notes Converted to Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.01
Debt Conversion, Original Debt, Amount			$ 50,000,000
Warrants Issued in Private Placement [Member]
Class of Warrant or Right, Outstanding				2,168,586
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				674,164
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.01
Warrants and Rights Outstanding, Term				25 years
Carlyle Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,636,099
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.01			$ 0.01	$ 0.01
Warrants and Rights Outstanding, Term			25 years
Class of Warrant or Right, Exercised During Period		250,585
Shares Paid for Tax Withholding for Exercise of Warrants		108
PIPE Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	635,307
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.01
Class of Warrant or Right, Exercised During Period	38,857
Class of Warrant or Right, Exercised During Period, Exercise Price	$ 0.01
Private Placement [Member]
Stock Issued During Period, Value, New Issues				$ 56,855,000

Note 8 - Warrants - Warrant Activity (Details)	9 Months Ended
Note 8 - Warrants - Warrant Activity (Details)	Sep. 30, 2018 $ / shares shares
Balance (in dollars per share) \| $ / shares
Balance, weighted average exercise price (in shares) \| shares
Warrants issued (in dollars per share) \| $ / shares	$ 0.01
Warrants issued, weighted average exercise price (in shares) \| shares	2,560,956
Warrants exercised (in dollars per share) \| $ / shares	$ 0.01
Warrants exercised, weighted average exercise price (in shares) \| shares	(289,550)
Balance (in dollars per share) \| $ / shares	$ 0.01
Balance, weighted average exercise price (in shares) \| shares	2,271,406

Note 9 - Stockholders' Equity (Details Textual) - USD ($)					9 Months Ended
	May 02, 2018	Apr. 26, 2018	Mar. 26, 2018	Feb. 08, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Cumulative Effect of New Accounting Principle in Period of Adoption							$ (12,069,000)
Stock Issued During Period, Shares, New Issues			103,213
Proceeds from Issuance of Private Placement			$ 1,800,000
Stock Issued During Period, Value, New Issues					$ 42,996,000
Carlyle Group [Member] \| Convertible Senior Notes Converted to Warrants [Member]
Debt Conversion, Original Debt, Amount	$ 50,000,000
Private Placement [Member]
Stock Issued During Period, Value, New Issues		$ 56,855,000
FGUSA Credit Facility [Member]
Debt Agreement, Maximum Borrowing Capacity				$ 131,100,000
Debt Instrument, Unamortized Discount, Total				10,000,000
Falcon Global USA LLC [Member]
Payments for Debtor-in-possession Obligations				$ 15,000,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (12,100,000)	$ (12,069,000)
Stock Issued During Period, Value, New Issues

Note 10 - Noncontrolling Interests in Subsidiaries (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 08, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ (15,766)	$ (22,356)	$ (74,083)	$ (66,444)
Net Income (Loss) Attributable to Noncontrolling Interest, Total		191	$ (1,881)	(4,269)	$ (4,582)
Falcon Global Holdings [Member]
Joint Venture, Total Capital	$ 112,500
Joint Venture, Contribution from Previous Joint Venture	43,300
Joint Venture, Contribution from Noncontrolling Interest	$ 18,800
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	28.00%
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total				14,200
Net Income (Loss) Attributable to Noncontrolling Interest, Total				4,000
Windcat Workboats [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total				2,000
Net Income (Loss) Attributable to Noncontrolling Interest, Total				200
Net Assets, Ending Balance		$ 18,500		$ 18,500

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686

+ Details

Note 10 - Noncontrolling Interests in Subsidiaries - Noncontrolling Interest (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Noncontrolling interest	$ 29,627	$ 14,975
Falcon Global [Member]
Noncontrolling interest percent	28.00%
Noncontrolling interest	$ 27,024	12,087
Windcat Workboats [Member]
Noncontrolling interest percent	12.50%
Noncontrolling interest	$ 2,311	2,608
Other Noncontrolling Interests [Member]
Noncontrolling interest percent	1.80%
Noncontrolling interest	$ 292	$ 280

Note 11 - Commitments and Contingencies (Details Textual) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)
Unrecorded Unconditional Purchase Obligation, Total	$ 34.5
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	2.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	17.3
Unrecorded Unconditional Purchase Obligation, Due within Three Years	14.5
Unrecorded Unconditional Purchase Obligation, Due within Four Years	20.8
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 46.1
SEACOR Holdings [Member]
Related Party Transaction, Rate	0.50%
Line of Credit [Member] \| Performance Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted \| €		€ 0.9
SeaCosco Offshore LLC [Member]
Unrecorded Unconditional Purchase Obligation, Total	$ 5.3
Fast Support Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	2	2
Supply Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	3	3
Wind Farm Utility Vessel [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	2	2
Standby Safety Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	1	1

Note 12 - Multi-employer Pension Plans (Details Textual) - Merchant Navy Ratings Pension Fund [Member] $ in Thousands, € in Millions	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)
Multiemployer Plans, Cumulative Funding Deficit			$ 291,900	€ 221.0
Scenario, Forecast [Member]
Multiemployer Plan, Contributions by Employer	$ 1,190	€ 0.9

Note 13 - Share Based Compensation - Equity Incentive Plan Transactions (Details)	9 Months Ended
	Sep. 30, 2018 shares
Outstanding as of December 31, 2017 (in shares)	613,700
Granted (in shares)	183,491
Exercised (in shares)	65,000
Outstanding as of September 30, 2018 (in shares)	732,191
Shares Available for future grants as of September 30, 2018 (in shares)	1,232,924
Director Stock Awards [Member]
Granted (in shares)	19,285
Restricted Stock [Member]
Granted (in shares)	120,600

Note 14 - Stock Repurchases (Details Textual) - USD ($)		9 Months Ended
Note 14 - Stock Repurchases (Details Textual) - USD ($)	May 24, 2018	Sep. 30, 2018	May 31, 2018	Dec. 31, 2017
Treasury Stock, Shares, Acquired	108	3,664
Treasury Stock, Value, Acquired, Cost Method	$ 2,562	$ 83,922
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.01
Carlyle Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.01	$ 0.01	$ 0.01

Note 15 - Segment Information (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 120,340	$ 92,169
MexMar [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	63,800
Other Offshore Marine Services Joint Ventures [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 56,500

Note 15 - Segment Information - Summary of Reportable Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Average Rates Per Day	$ 7,323	$ 6,006	$ 7,229	$ 5,806
Fleet Utilization	68.00%	60.00%	61.00%	54.00%
Fleet Available Days	12,617	12,580	37,746	36,709
Operating Revenues	$ 70,255	$ 47,813	$ 182,677	$ 124,440
Direct Costs and Expenses	48,598	38,422	132,926	109,002
Direct Vessel Profit	21,657	9,391	49,751	15,438
Operating expenses	32,401	28,776	104,323	96,724
Administrative and general	12,234	10,318	40,573	43,849
Depreciation and amortization	17,342	15,622	55,260	42,758
Gains (Losses) on Asset Dispositions and Impairments, Net	586	(9,744)	(1,002)	(11,243)
Operating Loss	(10,158)	(29,129)	(55,574)	(92,529)
Historical cost	1,279,000	1,204,409	1,279,000	1,204,409	$ 1,179,836
Accumulated depreciation	(568,752)	(558,919)	(568,752)	(558,919)	(560,160)
	710,248	645,490	710,248	645,490	$ 619,676
Leased-in Equipment [Member]
Operating expenses	2,825	2,836	8,490	10,117
Time Charter [Member]
Operating Revenues	62,902	45,267	166,870	114,800
Bareboat Charter [Member]
Operating Revenues	1,168	1,168	3,467	3,467
Other Marine Services [Member]
Operating Revenues	6,185	1,378	12,340	6,173
Personnel [Member]
Direct Costs and Expenses	25,021	22,179	71,430	59,547
Repairs and Maintenance [Member]
Direct Costs and Expenses	9,208	7,410	25,351	21,430
Drydocking [Member]
Direct Costs and Expenses	4,822	2,279	10,191	7,597
Insurance and Loss Reserves [Member]
Direct Costs and Expenses	1,857	1,396	4,981	5,081
Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	4,690	2,880	12,357	8,412
Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	3,000	2,278	8,616	6,935
UNITED STATES
Average Rates Per Day	$ 12,476	$ 7,212	$ 10,832	$ 8,661
Fleet Utilization	30.00%	16.00%	23.00%	12.00%
Fleet Available Days	3,433	3,859	11,193	11,920
Operating Revenues	$ 15,522	$ 5,703	$ 33,887	$ 15,611
Direct Costs and Expenses	8,915	7,823	23,984	20,681
Direct Vessel Profit	6,607	(2,120)	9,903	(5,070)
Administrative and general
Depreciation and amortization	5,227	5,224	17,677	16,573
Historical cost	479,303	429,500	479,303	429,500
Accumulated depreciation	(242,364)	(237,210)	(242,364)	(237,210)
	236,939	192,290	236,939	192,290
UNITED STATES \| Leased-in Equipment [Member]
Operating expenses	1,853	1,870	5,571	6,286
UNITED STATES \| Time Charter [Member]
Operating Revenues	12,800	4,587	27,834	12,471
UNITED STATES \| Bareboat Charter [Member]
Operating Revenues
UNITED STATES \| Other Marine Services [Member]
Operating Revenues	2,722	1,116	6,053	3,140
UNITED STATES \| Personnel [Member]
Direct Costs and Expenses	4,853	4,455	13,481	11,768
UNITED STATES \| Repairs and Maintenance [Member]
Direct Costs and Expenses	1,801	1,289	4,024	2,963
UNITED STATES \| Drydocking [Member]
Direct Costs and Expenses	375	1,109	1,810	1,992
UNITED STATES \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	612	598	1,948	2,608
UNITED STATES \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,120	249	2,513	1,104
UNITED STATES \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	154	123	208	246
Africa [Member]
Average Rates Per Day	$ 9,315	$ 10,611	$ 9,425	$ 10,192
Fleet Utilization	82.00%	71.00%	86.00%	67.00%
Fleet Available Days	1,475	1,283	4,066	3,425
Operating Revenues	$ 12,978	$ 9,390	$ 36,531	$ 23,430
Direct Costs and Expenses	10,632	6,777	27,423	21,650
Direct Vessel Profit	2,346	2,613	9,108	1,780
Administrative and general
Depreciation and amortization	2,381	2,456	8,112	6,105
Historical cost	186,729	189,845	186,729	189,845
Accumulated depreciation	(53,498)	(54,052)	(53,498)	(54,052)
	133,231	135,793	133,231	135,793
Africa [Member] \| Leased-in Equipment [Member]
Operating expenses	960	966	2,885	2,905
Africa [Member] \| Time Charter [Member]
Operating Revenues	11,201	9,700	33,117	23,333
Africa [Member] \| Bareboat Charter [Member]
Operating Revenues
Africa [Member] \| Other Marine Services [Member]
Operating Revenues	1,777	(310)	3,414	97
Africa [Member] \| Personnel [Member]
Direct Costs and Expenses	4,486	3,588	12,873	9,624
Africa [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,438	1,324	5,457	5,102
Africa [Member] \| Drydocking [Member]
Direct Costs and Expenses	1,201	311	2,113	2,051
Africa [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	323	157	789	696
Africa [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,081	693	2,650	1,956
Africa [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	1,103	704	3,541	2,221
Middle East and Asia [Member]
Average Rates Per Day	$ 8,156	$ 7,138	$ 8,156	$ 6,916
Fleet Utilization	76.00%	61.00%	75.00%	55.00%
Fleet Available Days	2,024	2,194	6,161	5,970
Operating Revenues	$ 12,507	$ 9,149	$ 36,550	$ 23,373
Direct Costs and Expenses	9,033	9,608	27,786	26,574
Direct Vessel Profit	3,474	(459)	8,764	(3,201)
Administrative and general
Depreciation and amortization	4,207	4,320	14,608	10,826
Historical cost	310,110	328,263	310,110	328,263
Accumulated depreciation	(81,121)	(93,535)	(81,121)	(93,535)
	228,989	234,728	228,989	234,728
Middle East and Asia [Member] \| Leased-in Equipment [Member]
Operating expenses				862
Middle East and Asia [Member] \| Time Charter [Member]
Operating Revenues	12,590	9,490	37,555	22,728
Middle East and Asia [Member] \| Bareboat Charter [Member]
Operating Revenues
Middle East and Asia [Member] \| Other Marine Services [Member]
Operating Revenues	(83)	(341)	(1,005)	645
Middle East and Asia [Member] \| Personnel [Member]
Direct Costs and Expenses	4,361	4,731	12,452	12,001
Middle East and Asia [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,091	2,309	8,095	6,832
Middle East and Asia [Member] \| Drydocking [Member]
Direct Costs and Expenses	352		413	414
Direct Costs and Expenses		(102)
Middle East and Asia [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	385	363	982	1,062
Middle East and Asia [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	892	1,115	2,848	2,547
Middle East and Asia [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	952	1,192	2,996	3,718
Brazil, Mexico, Central and South America [Member]
Average Rates Per Day	$ 17,604	$ 16,060	$ 17,807	$ 16,060
Fleet Utilization	80.00%	49.00%	65.00%	24.00%
Fleet Available Days	531	184	1,166	379
Operating Revenues	$ 9,063	$ 2,766	$ 18,247	$ 5,302
Direct Costs and Expenses	3,017	613	6,158	936
Direct Vessel Profit	6,046	2,153	12,089	4,366
Administrative and general
Depreciation and amortization	2,521	1,025	6,020	2,474
Historical cost	102,776	78,976	102,776	78,976
Accumulated depreciation	(47,374)	(42,590)	(47,374)	(42,590)
	55,402	36,386	55,402	36,386
Brazil, Mexico, Central and South America [Member] \| Leased-in Equipment [Member]
Operating expenses
Brazil, Mexico, Central and South America [Member] \| Time Charter [Member]
Operating Revenues	7,479	1,439	13,409	1,439
Brazil, Mexico, Central and South America [Member] \| Bareboat Charter [Member]
Operating Revenues	1,168	1,168	3,467	3,467
Brazil, Mexico, Central and South America [Member] \| Other Marine Services [Member]
Operating Revenues	416	159	1,371	396
Brazil, Mexico, Central and South America [Member] \| Personnel [Member]
Direct Costs and Expenses	1,662	326	3,257	487
Brazil, Mexico, Central and South America [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	312	110	649	230
Brazil, Mexico, Central and South America [Member] \| Drydocking [Member]
Direct Costs and Expenses	103		114
Brazil, Mexico, Central and South America [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	163	75	399	86
Brazil, Mexico, Central and South America [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	427	33	841	60
Brazil, Mexico, Central and South America [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	350	69	898	73
Europe [Member]
Average Rates Per Day	$ 4,287	$ 4,390	$ 4,721	$ 4,328
Fleet Utilization	85.00%	90.00%	77.00%	84.00%
Fleet Available Days	5,154	5,060	15,159	15,015
Operating Revenues	$ 20,185	$ 20,805	$ 57,462	$ 56,724
Direct Costs and Expenses	17,001	13,601	47,575	39,161
Direct Vessel Profit	3,184	7,204	9,887	17,563
Administrative and general
Depreciation and amortization	3,006	2,597	8,843	6,780
Historical cost	200,082	177,825	200,082	177,825
Accumulated depreciation	(144,395)	(131,532)	(144,395)	(131,532)
	55,687	46,293	55,687	46,293
Europe [Member] \| Leased-in Equipment [Member]
Operating expenses	12		34	64
Europe [Member] \| Time Charter [Member]
Operating Revenues	18,832	20,051	54,955	54,829
Europe [Member] \| Bareboat Charter [Member]
Operating Revenues
Europe [Member] \| Other Marine Services [Member]
Operating Revenues	1,353	754	2,507	1,895
Europe [Member] \| Personnel [Member]
Direct Costs and Expenses	9,659	9,079	29,367	25,667
Europe [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,566	2,378	7,126	6,303
Europe [Member] \| Drydocking [Member]
Direct Costs and Expenses	2,791	961	5,741	3,140
Europe [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	374	203	863	629
Europe [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,170	790	3,505	2,745
Europe [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	$ 441	$ 190	$ 973	$ 677

Note 15 - Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity in earnings (losses) of 50% or less owned companies	$ (1,027)	$ (7,306)	$ (1,540)	$ (5,297)
MexMar [Member]
Equity in earnings (losses) of 50% or less owned companies	137	793	2,644	3,382
Other Offshore Marine Services Joint Ventures [Member]
Equity in earnings (losses) of 50% or less owned companies	$ (1,164)	$ (8,099)	$ (4,184)	$ (8,679)