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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 and is

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 to 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 operation

(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 incur

red (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

six

months ended

June 30

were as follows (in thousands):

	201 8		201 7
Balance at beginning of period	$	10,104	$	6,953
Revenues deferred during the period		1,673		2,337
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	10,227	$	9,290

As of

June 30, 2018,

contract liabilities 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 1

7, 2012,

he 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

June 30, 2018,

contract liabilities of

$3.2

million related 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.

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

June 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

six

months ended

June 30, 2018,

capitalized interest totaled

$1.0

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

six

months ended

June 30, 2018,

the Company recognized

$3.0

million of impairment charges primarily related to

four

anchor-handling 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

six

months ended

June 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

six

months ended

June 30, 2018,

the Company's effective income tax rate of

20.1%

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, and a reversal of an unrecognized tax benefit. During the

six

months ended

June 30, 2017,

the Company’s effective income tax rate of

27.2%

was primarily due to losses of foreign subsidiaries

not

benefited.

Deferred Gains.

The 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

six

months ended

June 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		(4,019	)		(4,099)
Other adjustments		(250	)		(364	)
Balance at end of period	$	20,737		$	29,447

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)		(847	)		246			(601	)		(26	)		(7	)	$	(634	)
Income tax expense		—			(35	)		(35	)		—			—			(35	)
Six months Ended June 30, 2018	$	(14,042	)	$	913		$	(13,129	)	$	(1,383	)	$	(6	)	$	(669	)

Loss Per Share.

Basic 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. 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

six

months ended

June 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

six

months ended

June 30, 2018,

diluted loss per common share of the Company excluded

196,338

shares of restricted stock and

694,691

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

New Accounting Pronouncements.

February 25, 2016,

the Financial Accounting Standards Board (“FASB”) issued a comprehensive new leasing standard, which improves transparency and comparability among companies by requiring lessees to recognize a lease liability and a corresponding lease 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 use the modified retrospective approach upon adoption. The Company expects the adoption of the new standard will have a material impact on its consolidated financial position, results of operations and cash flows, although it has

not

yet determined the extent of the impact.

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.

Note 2 - Equipment Acquisitions and Dispositions

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment Disclosure [Text Block]

2.	EQUIPMENT ACQUISITIONS AND DISPOSITIONS

During the

six

months ended

June 30, 2018,

capital expenditures were

$18.8

million. Equipment deliveries during the

six

months ended

June 30, 2018

included

one

wind farm utility vessel,

six

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

Note

below a

two

platform supply

vessels constructed through the SEACOSCO joint venture as described in Note

below.

During the

six

months ended

June 30, 2018,

the Company sold

one

fast support vessel and

two

supply vessels previously retired and removed from service,

one

standby safety vessel,

one

supply vessel and

one

fast support vessel, and other property and equipment for net proceeds of

$2.6

million (

$2.5

million in cash and

$0.1

million of previously received deposits) and gains of

$1.4

million.

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

6 Months Ended

Jun. 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 Company's total committed investment for construction and working capital requirements is approximately

$27.5

million for an unconsolidated

50%

interest in SEACOSCO. During the

six

months ended

June 30, 2018,

the Company contributed capital of

$25.6

million in cash. The remaining committed investment will be du

e as the remaining vessel

and equipmen

t are d

elivered as part of the

$27.5

million commitment. The Company is responsible for full commercial, operational, and technical management of the vessels on a worldwide basis.

SEACOR Grant DIS.

As of

June 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

$0.4

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

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

June 30, 2018,

the total amount guaranteed by the Company under this arrangement is

$0.5

million.

In addition, as of

June 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 their 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 is

$1.2

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

Note 4 - Long-term Debt

6 Months Ended

Jun. 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.

February 8, 2018,

a wholly-owned subsidiary of the Company 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 (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

six

months ending

June 30, 2018

the Company borrowed

$10.0

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

six

months ended

June 30, 2018,

the Company converted

€6.0

million denominated debt to pound sterling debt, paying off approximately

$7.5

million in euro debt and borrowing approximately

$8.5

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

$1.0

million to be used for future capital commitments.

Letters of Credit

As of

June 30, 2018,

the Company had outstanding letters of credit of

$7.9

million securing

one

long-term debt obligation, and

$1.7

million for labor and performance guarantees.

Note 5 - Income Taxes

6 Months Ended

Jun. 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

six

months ended

June 30, 2018:

Statutory rate	21.0	%
Noncontrolling interests	(1.2	)%
Foreign earnings not subject to U.S. income tax	(3.0	)%
Foreign taxes not creditable against U.S. income tax	(2.4	)%
Unrecognized tax benefit	5.4	%
Other	0.3	%
	20.1	%

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

six

months ending June

30,

2018,

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

Note 6 - Derivative Instruments and Hedging Strategies

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Text Block]

6.	DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES

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

June 30, 2018

were as follows (in thousands):

	Derivative Asset (1)		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	436	$	44	(2)
		436		44
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		21,886
Interest rate swap agreements		1,104		—
	$	1,540	$	21,930

______________________

(

)

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

six

months ended

June 30, 2018.

As of

June 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 of

$104.0

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

•

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

2019

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

1.52%

on the amortized notional value of

$19.7

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

•

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

2019

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

1.52%

on the amortized notional value of

$17.4

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

Other Derivative Instruments.

The Company recognized (losses) gains on derivative instruments

not

designated as hedging instruments for the

six

months ended

June 30 as follows (in thousands):

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(15,054	)	$	145
Forward currency exchange, option and future contracts		—			(56)
Interest rate swap agreements		870			(391	)
	$	(14,184	)	$	(302	)

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

June 30, 2018,

the interest rate swaps held by the Company or its

50%

or less owned companies were as follows:

•

Falcon Global International had an interest rate swap agreement maturing in

2022

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

2.06%

on the amortized notional value of

$53.1

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

•

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

$30.4

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

Note 7 - Fair Value Measurements

6 Months Ended

Jun. 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

June 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)	$	—	$	1,541	$	—
Construction reserve funds		38,152		—		—
LIABILITIES
Derivative instruments		—		44		21,886

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 other financial assets and liabilities as of

June 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	$	88,190	$	88,190	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		371,770		—		357,742		—

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. The long-term debt balance includes

$121.6

million, net, assumed from FGUSA. 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 that were measured at fair value during the

six

months ended

June 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

six

months ended

June 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

6 Months Ended

Jun. 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 (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 - June 30, 2018	$	0.01		2,560,956
Warrants exercised - January 1 - June 30, 2018	$	0.01		(289,550	)
Balance as of June 30, 2018	$	0.01		2,271,406

Note 9 - Stockholders' Equity

6 Months Ended

Jun. 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

6 Months Ended

Jun. 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		June 30, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	26,967	$	12,087
Windcat Workboats		12.5%		2,201		2,608
Other		1.8%		287		280
			$	29,455	$	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

six

months ended

June 30, 2018,

the net loss of Falcon Global Holdings was

$14.4

million, of which

$4.0

million was attributable to noncontrolling interests.

Windcat Workboats.

Windcat 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

June 30, 2018,

the net assets of Windcat Workboats were

$17.6

million. During the

six

months ended

June 30, 2018,

the net loss of Windcat Workboats was

$3.3

million, of which

$0.4

million was attributable to noncontrolling interests.

Note 11 - Commitments and Contingencies	6 Months Ended
Note 11 - Commitments and Contingencies	Jun. 30, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. COMMITMENTS AND CONTINGENCIES As of June 30, 2018, the Company’s unfunded capital commitments were $43.3 million for two fast support vessels, three supply vessels, three wind farm utility vessels, and a conversion of one supply vessel to standby safety vessel. Of the amount of unfunded capital commitments, $12.7 million is payable during the remainder of 2018, $21.6 million is payable during 2019 and $9.0 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. As of June 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 June 30, 2018, SEACOR Holdings has guaranteed $51.6 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	6 Months Ended
Note 12 - Multi-employer Pension Plans	Jun. 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 will be invoiced in September 2018 and are payable in four annual installments beginning 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

6 Months Ended

Jun. 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

six

months ended

June 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			145,991
Exercised			65,000
Outstanding as of June 30, 2018			694,691

Shares Available for future grants as of June 30, 2018			1,270,424

Note 14 - Stock Repurchases	6 Months Ended
Note 14 - Stock Repurchases	Jun. 30, 2018
Notes to Financial Statements
Treasury Stock [Text Block]	14. STOCK REPURCHASES On May 14, 2018, the Company acquired for treasury 2,242 shares of Common Stock for an aggregate purchase price of $51,454 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

6 Months Ended

Jun. 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 June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,503		$	9,509		$	8,226		$	19,127		$	4,823		$	7,324
Fleet Utilization		23	%		88	%		82	%		57	%		76	%		62	%
Fleet Available Days		3,710			1,331			2,005			416			5,066			12,528
Operating Revenues:
Time charter	$	9,052		$	11,122		$	13,591		$	4,556		$	18,505		$	56,826
Bareboat charter		—			—			—			1,156			—			1,156
Other marine services		1,676			350			(792	)		845			640			2,719
		10,728			11,472			12,799			6,557			19,145			60,701
Direct Costs and Expenses:
Operating:
Personnel		4,636			4,314			4,069			1,219			10,495			24,733
Repairs and maintenance		1,529			1,663			3,576			32			2,270			9,070
Drydocking		910			910			72			11			1,209			3,112
Insurance and loss reserves		902			248			361			169			254			1,934
Fuel, lubes and supplies		900			900			922			349			1,051			4,122
Other		29			1,402			836			488			254			3,009
		8,906			9,437			9,836			2,268			15,533			45,980
Direct Vessel Profit	$	1,822		$	2,035		$	2,963		$	4,289		$	3,612			14,721
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,856		$	962		$	—		$	—		$	22			2,840
Administrative and general																	15,532
Depreciation and amortization	$	5,915		$	2,924		$	4,311		$	2,280		$	2,976			18,406
																	36,778
Gains on Asset Dispositions and Impairments																	1,055
Operating Loss																$	(21,002	)

	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 Six Months Ended June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	9,740		$	9,482		$	8,155		$	18,069		$	4,984		$	7,174
Fleet Utilization		20	%		89	%		74	%		52	%		72	%		58	%
Fleet Available Days		7,760			2,591			4,137			635			10,006			25,129
Operating Revenues:
Time charter	$	15,034		$	21,916		$	24,965		$	5,930		$	36,123		$	103,968
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		3,331			1,637			(922	)		955			1,154			6,155
		18,365			23,553			24,043			9,184			37,277			112,422
Direct Costs and Expenses:
Operating:
Personnel		8,628			8,387			8,091			1,595			19,708			46,409
Repairs and maintenance		2,223			3,019			6,004			337			4,560			16,143
Drydocking		1,435			912			61			11			2,950			5,369
Insurance and loss reserves		1,336			466			597			236			489			3,124
Fuel, lubes and supplies		1,393			1,569			1,956			414			2,335			7,667
Other		54			2,438			2,044			548			532			5,616
		15,069			16,791			18,753			3,141			30,574			84,328
Direct Vessel Profit	$	3,296		$	6,762		$	5,290		$	6,043		$	6,703			28,094
Other Costs and Expenses:
Operating:
Leased-in equipment	$	3,718		$	1,925		$	—		$	—		$	22			5,665
Administrative and general																	28,339
Depreciation and amortization	$	12,450		$	5,731		$	10,401		$	3,499		$	5,837			37,918
																	71,922
Losses on Asset Dispositions and Impairment																	(1,588	)
Operating Loss																$	(45,416	)

As of June 30, 2018
Property and Equipment:
Historical cost	$	439,026		$	184,037		$	317,536		$	165,145		$	182,111		$	1,287,855
Accumulated depreciation		(225,116	)		(57,909	)		(86,239	)		(58,078	)		(137,135	)		(564,477	)
	$	213,910		$	126,128		$	231,297		$	107,067		$	44,976		$	723,378

	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 June 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	9,619		$	10,348		$	6,580		$	—		$	4,176		$	5,649
Fleet Utilization		13	%		67	%		55	%		—	%		90	%		56	%
Fleet Available Days		4,063			1,123			2,067			105			5,005			12,363
Operating Revenues:
Time charter	$	4,889		$	7,786		$	7,415		$	—		$	18,713		$	38,803
Bareboat charter		—			—			—			1,156			—			1,156
Other marine services		1,198			215			109			162			680			2,364
		6,087			8,001			7,524			1,318			19,393			42,323
Direct Costs and Expenses:
Operating:
Personnel		4,183			3,428			4,147			148			8,671			20,577
Repairs and maintenance		937			3,234			3,947			116			2,191			10,425
Drydocking		310			683			358			—			900			2,251
Insurance and loss reserves		1,205			357			353			4			207			2,126
Fuel, lubes and supplies		545			704			908			27			1,006			3,190
Other		51			871			1,061			3			237			2,223
		7,231			9,277			10,774			298			13,212			40,792
Direct Vessel (Loss) Profit	$	(1,144	)	$	(1,276	)	$	(3,250	)	$	1,020		$	6,181			1,531
Other Costs and Expenses:
Operating:
Leased-in equipment	$	2,205		$	969		$	516		$	—		$	—			3,690
Administrative and general																	21,705
Depreciation and amortization	$	5,749		$	2,059		$	3,979		$	784		$	2,062			14,633
																	40,028
Losses on Asset Dispositions and Impairments																	(6,318	)
Operating Loss																$	(44,815	)

	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 Six Months Ended June 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	9,808		$	9,913		$	6,765		$	—		$	4,294		$	5,683
Fleet Utilization		10	%		64	%		52	%		—	%		81	%		51	%
Fleet Available Days		8,061			2,142			3,777			195			9,955			24,130
Operating Revenues:
Time charter	$	7,884		$	13,633		$	13,238		$	—		$	34,778		$	69,533
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		2,024			407			986			237			1,141			4,795
		9,908			14,040			14,224			2,536			35,919			76,627
Direct Costs and Expenses:
Operating:
Personnel		7,313			6,036			7,270			161			16,588			37,368
Repairs and maintenance		1,674			3,778			4,523			120			3,925			14,020
Drydocking		883			1,740			516			—			2,179			5,318
Insurance and loss reserves		2,010			539			699			11			426			3,685
Fuel, lubes and supplies		855			1,263			1,432			27			1,955			5,532
Other		123			1,517			2,526			4			487			4,657
		12,858			14,873			16,966			323			25,560			70,580
Direct Vessel (Loss) Profit	$	(2,950	)	$	(833	)	$	(2,742	)	$	2,213		$	10,359			6,047
Other Costs and Expenses:
Operating:
Leased-in equipment	$	4,416		$	1,939		$	862		$	—		$	64			7,281
Administrative and general																	33,531
Depreciation and amortization	$	11,349		$	3,649		$	6,506		$	1,449		$	4,183			27,136
																	67,948
Losses on Asset Dispositions and Impairment																	(1,499	)
Operating Loss																$	(63,400	)

As of June 30, 2017
Property and Equipment:
Historical cost	$	417,675		$	183,661		$	302,892		$	78,976		$	171,951		$	1,155,155
Accumulated depreciation		(233,758	)		(59,300	)		(83,880	)		(41,565	)		(125,319	)		(543,822	)
	$	183,917		$	124,361		$	219,012		$	37,411		$	46,632		$	611,333

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

June 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

$63.7

million and

$51.7

million, respectively. Equity in (losses) earnings of

50%

or less owned companies, net of tax for the

six

months ended

June 30

were as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
MexMar	$	1,076		$	1,222	$	2,508		$	2,589
Other		(1,797	)		349		(3,021	)		(580	)
	$	(721	)	$	1,571	$	(513	)	$	2,009

Note 16 - Subsequent Event	6 Months Ended
Note 16 - Subsequent Event	Jun. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	16. SUBSEQUENT EVENT On July 5, 2018, the Company acquired 100% of the membership interests in two Marshall Islands limited liability companies in exchange for assumed debt of $11.0 million. Each Marshall Islands company owns one 2013 -built AHTS vessel which was previously managed by the Company. The vessels are currently operating under contract in the Middle East and West Africa regions.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 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

(see Note

Revenues from Customers.

one

three

red (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

six

months ended

June 30

were as follows (in thousands):

	201 8		201 7
Balance at beginning of period	$	10,104	$	6,953
Revenues deferred during the period		1,673		2,337
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	10,227	$	9,290

As of

June 30, 2018,

contract liabilities of

$6.8

August 1

7, 2012,

he 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

As of

June 30, 2018,

contract liabilities of

$3.2

million related 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.

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

June 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

six

months ended

June 30, 2018,

capitalized interest totaled

$1.0

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

six

months ended

June 30, 2018,

the Company recognized

$3.0

million of impairment charges primarily related to

four

anchor-handling 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%

may

six

months ended

June 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

six

months ended

June 30, 2018,

the Company's effective income tax rate of

20.1%

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, and a reversal of an unrecognized tax benefit. During the

six

months ended

June 30, 2017,

the Company’s effective income tax rate of

27.2%

was primarily due to losses of foreign subsidiaries

not

benefited.

Deferred Gains [Policy Text Block]

Deferred Gains.

The 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%

six

months ended

June 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		(4,019	)		(4,099)
Other adjustments		(250	)		(364	)
Balance at end of period	$	20,737		$	29,447

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)		(847	)		246			(601	)		(26	)		(7	)	$	(634	)
Income tax expense		—			(35	)		(35	)		—			—			(35	)
Six months Ended June 30, 2018	$	(14,042	)	$	913		$	(13,129	)	$	(1,383	)	$	(6	)	$	(669	)

Earnings Per Share, Policy [Policy Text Block]

Loss Per Share.

Basic 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

For the

six

months ended

June 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

six

months ended

June 30, 2018,

diluted loss per common share of the Company excluded

196,338

shares of restricted stock and

694,691

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

New Accounting Pronouncements, Policy [Policy Text Block]

New Accounting Pronouncements.

February 25, 2016,

January 1, 2019

not

yet determined the extent of the impact.

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.

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

6 Months Ended

Jun. 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		1,673		2,337
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	10,227	$	9,290

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		(4,019	)		(4,099)
Other adjustments		(250	)		(364	)
Balance at end of period	$	20,737		$	29,447

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)		(847	)		246			(601	)		(26	)		(7	)	$	(634	)
Income tax expense		—			(35	)		(35	)		—			—			(35	)
Six months Ended June 30, 2018	$	(14,042	)	$	913		$	(13,129	)	$	(1,383	)	$	(6	)	$	(669	)

Note 5 - Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

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

Statutory rate	21.0	%
Noncontrolling interests	(1.2	)%
Foreign earnings not subject to U.S. income tax	(3.0	)%
Foreign taxes not creditable against U.S. income tax	(2.4	)%
Unrecognized tax benefit	5.4	%
Other	0.3	%
	20.1	%

Note 6 - Derivative Instruments and Hedging Strategies (Tables)

6 Months Ended

Jun. 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)	$	436	$	44	(2)
		436		44
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		21,886
Interest rate swap agreements		1,104		—
	$	1,540	$	21,930

Derivatives Not Designated as Hedging Instruments [Table Text Block]

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(15,054	)	$	145
Forward currency exchange, option and future contracts		—			(56)
Interest rate swap agreements		870			(391	)
	$	(14,184	)	$	(302	)

Note 7 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 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)	$	—	$	1,541	$	—
Construction reserve funds		38,152		—		—
LIABILITIES
Derivative instruments		—		44		21,886

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	$	88,190	$	88,190	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		371,770		—		357,742		—

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)

6 Months Ended

Jun. 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 - June 30, 2018	$	0.01		2,560,956
Warrants exercised - January 1 - June 30, 2018	$	0.01		(289,550	)
Balance as of June 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)

6 Months Ended

Jun. 30, 2018

Schedule of Noncontrolling Interest [Table Text Block]

	Noncontrolling Interests		June 30, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	26,967	$	12,087
Windcat Workboats		12.5%		2,201		2,608
Other		1.8%		287		280
			$	29,455	$	14,975

Note 13 - Share Based Compensation (Tables)

6 Months Ended

Jun. 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			145,991
Exercised			65,000
Outstanding as of June 30, 2018			694,691

Shares Available for future grants as of June 30, 2018			1,270,424

Note 15 - Segment Information (Tables)

6 Months Ended

Jun. 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 June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,503		$	9,509		$	8,226		$	19,127		$	4,823		$	7,324
Fleet Utilization		23	%		88	%		82	%		57	%		76	%		62	%
Fleet Available Days		3,710			1,331			2,005			416			5,066			12,528
Operating Revenues:
Time charter	$	9,052		$	11,122		$	13,591		$	4,556		$	18,505		$	56,826
Bareboat charter		—			—			—			1,156			—			1,156
Other marine services		1,676			350			(792	)		845			640			2,719
		10,728			11,472			12,799			6,557			19,145			60,701
Direct Costs and Expenses:
Operating:
Personnel		4,636			4,314			4,069			1,219			10,495			24,733
Repairs and maintenance		1,529			1,663			3,576			32			2,270			9,070
Drydocking		910			910			72			11			1,209			3,112
Insurance and loss reserves		902			248			361			169			254			1,934
Fuel, lubes and supplies		900			900			922			349			1,051			4,122
Other		29			1,402			836			488			254			3,009
		8,906			9,437			9,836			2,268			15,533			45,980
Direct Vessel Profit	$	1,822		$	2,035		$	2,963		$	4,289		$	3,612			14,721
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,856		$	962		$	—		$	—		$	22			2,840
Administrative and general																	15,532
Depreciation and amortization	$	5,915		$	2,924		$	4,311		$	2,280		$	2,976			18,406
																	36,778
Gains on Asset Dispositions and Impairments																	1,055
Operating Loss																$	(21,002	)

	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 Six Months Ended June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	9,740		$	9,482		$	8,155		$	18,069		$	4,984		$	7,174
Fleet Utilization		20	%		89	%		74	%		52	%		72	%		58	%
Fleet Available Days		7,760			2,591			4,137			635			10,006			25,129
Operating Revenues:
Time charter	$	15,034		$	21,916		$	24,965		$	5,930		$	36,123		$	103,968
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		3,331			1,637			(922	)		955			1,154			6,155
		18,365			23,553			24,043			9,184			37,277			112,422
Direct Costs and Expenses:
Operating:
Personnel		8,628			8,387			8,091			1,595			19,708			46,409
Repairs and maintenance		2,223			3,019			6,004			337			4,560			16,143
Drydocking		1,435			912			61			11			2,950			5,369
Insurance and loss reserves		1,336			466			597			236			489			3,124
Fuel, lubes and supplies		1,393			1,569			1,956			414			2,335			7,667
Other		54			2,438			2,044			548			532			5,616
		15,069			16,791			18,753			3,141			30,574			84,328
Direct Vessel Profit	$	3,296		$	6,762		$	5,290		$	6,043		$	6,703			28,094
Other Costs and Expenses:
Operating:
Leased-in equipment	$	3,718		$	1,925		$	—		$	—		$	22			5,665
Administrative and general																	28,339
Depreciation and amortization	$	12,450		$	5,731		$	10,401		$	3,499		$	5,837			37,918
																	71,922
Losses on Asset Dispositions and Impairment																	(1,588	)
Operating Loss																$	(45,416	)

As of June 30, 2018
Property and Equipment:
Historical cost	$	439,026		$	184,037		$	317,536		$	165,145		$	182,111		$	1,287,855
Accumulated depreciation		(225,116	)		(57,909	)		(86,239	)		(58,078	)		(137,135	)		(564,477	)
	$	213,910		$	126,128		$	231,297		$	107,067		$	44,976		$	723,378

	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 June 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	9,619		$	10,348		$	6,580		$	—		$	4,176		$	5,649
Fleet Utilization		13	%		67	%		55	%		—	%		90	%		56	%
Fleet Available Days		4,063			1,123			2,067			105			5,005			12,363
Operating Revenues:
Time charter	$	4,889		$	7,786		$	7,415		$	—		$	18,713		$	38,803
Bareboat charter		—			—			—			1,156			—			1,156
Other marine services		1,198			215			109			162			680			2,364
		6,087			8,001			7,524			1,318			19,393			42,323
Direct Costs and Expenses:
Operating:
Personnel		4,183			3,428			4,147			148			8,671			20,577
Repairs and maintenance		937			3,234			3,947			116			2,191			10,425
Drydocking		310			683			358			—			900			2,251
Insurance and loss reserves		1,205			357			353			4			207			2,126
Fuel, lubes and supplies		545			704			908			27			1,006			3,190
Other		51			871			1,061			3			237			2,223
		7,231			9,277			10,774			298			13,212			40,792
Direct Vessel (Loss) Profit	$	(1,144	)	$	(1,276	)	$	(3,250	)	$	1,020		$	6,181			1,531
Other Costs and Expenses:
Operating:
Leased-in equipment	$	2,205		$	969		$	516		$	—		$	—			3,690
Administrative and general																	21,705
Depreciation and amortization	$	5,749		$	2,059		$	3,979		$	784		$	2,062			14,633
																	40,028
Losses on Asset Dispositions and Impairments																	(6,318	)
Operating Loss																$	(44,815	)

	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 Six Months Ended June 30, 2017
Time Charter Statistics:
Average Rates Per Day	$	9,808		$	9,913		$	6,765		$	—		$	4,294		$	5,683
Fleet Utilization		10	%		64	%		52	%		—	%		81	%		51	%
Fleet Available Days		8,061			2,142			3,777			195			9,955			24,130
Operating Revenues:
Time charter	$	7,884		$	13,633		$	13,238		$	—		$	34,778		$	69,533
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		2,024			407			986			237			1,141			4,795
		9,908			14,040			14,224			2,536			35,919			76,627
Direct Costs and Expenses:
Operating:
Personnel		7,313			6,036			7,270			161			16,588			37,368
Repairs and maintenance		1,674			3,778			4,523			120			3,925			14,020
Drydocking		883			1,740			516			—			2,179			5,318
Insurance and loss reserves		2,010			539			699			11			426			3,685
Fuel, lubes and supplies		855			1,263			1,432			27			1,955			5,532
Other		123			1,517			2,526			4			487			4,657
		12,858			14,873			16,966			323			25,560			70,580
Direct Vessel (Loss) Profit	$	(2,950	)	$	(833	)	$	(2,742	)	$	2,213		$	10,359			6,047
Other Costs and Expenses:
Operating:
Leased-in equipment	$	4,416		$	1,939		$	862		$	—		$	64			7,281
Administrative and general																	33,531
Depreciation and amortization	$	11,349		$	3,649		$	6,506		$	1,449		$	4,183			27,136
																	67,948
Losses on Asset Dispositions and Impairment																	(1,499	)
Operating Loss																$	(63,400	)

As of June 30, 2017
Property and Equipment:
Historical cost	$	417,675		$	183,661		$	302,892		$	78,976		$	171,951		$	1,155,155
Accumulated depreciation		(233,758	)		(59,300	)		(83,880	)		(41,565	)		(125,319	)		(543,822	)
	$	183,917		$	124,361		$	219,012		$	37,411		$	46,632		$	611,333

Equity Method Investments [Table Text Block]

	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
MexMar	$	1,076		$	1,222	$	2,508		$	2,589
Other		(1,797	)		349		(3,021	)		(580	)
	$	(721	)	$	1,571	$	(513	)	$	2,009

Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 01, 2017	Dec. 31, 2016
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01	$ 0.01
Deferred Revenue	$ 10,227	$ 9,290	$ 10,104		$ 6,953
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total	1,000
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	20.10%	27.20%
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
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	694,691
Geographic Distribution, Domestic [Member]
Deferred Revenue	$ 6,800
Geographic Distribution, Foreign [Member]
Deferred Revenue	$ 3,200

Note 1 - Basis of Presentation and Accounting Policies - Deferred Revenues (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Balance at beginning of period	$ 10,104	$ 6,953
Revenues deferred during the period	1,673	2,337
Revenues recognized during the period	(1,550)
Balance at end of period	$ 10,227	$ 9,290

Note 1 - Basis of Presentation and Accounting Policies - Property and Equipment Useful Life (Details)	6 Months Ended
	Jun. 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	6 Months Ended
	Jun. 30, 2018	Jun. 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	(4,019)	(4,099)
Other adjustments	(250)	(364)
Balance at end of period	$ 20,737	$ 29,447

Note 1 - Basis of Presentation and Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance			$ 523,166
	$ (2,807)	$ 1,620	(634)	$ 2,730
Income tax expense	(8)	(533)	(35)	(887)
Balance	580,815		580,815
Other comprehensive loss	(2,815)	$ 1,087	(669)	$ 1,843
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance			(13,195)
			(847)
Income tax expense
Balance	(14,042)		(14,042)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance			702
			246
Income tax expense			(35)
Balance	913		913
AOCI Attributable to Parent [Member]
Balance			(12,493)
			(601)
Income tax expense			(35)
Balance	(13,129)		(13,129)
Other comprehensive loss			(636)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]
Balance			(1,357)
			(26)
Income tax expense
Balance	(1,383)		(1,383)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Balance			1
			(7)
Income tax expense
Balance	$ (6)		$ (6)

Note 2 - Equipment Acquisitions and Dispositions (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Payments to Acquire Property, Plant, and Equipment, Including Fair Value Hedges	$ 18.8
Proceeds from Sale of Property, Plant, and Equipment, Including Deposits	2.6
Proceeds from Sale of Property, Plant, and Equipment, Excluding Deposits for Future Vessel Sales	2.5
Proceeds from Deposits	0.1
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 1.4
Wind Farm Utility Vessel [Member]
Number of Equipment Acquired	1
Liftboats [Member]
Number of Equipment Acquired	6
Supply Vessels [Member]
Number of Equipment Acquired	2
Number of Equipment Sold	1
Fast Support Vessels [Member]
Number of Equipment Sold	1
Supply Vessel Previously Retired [Member]
Number of Equipment Sold	2
Standby Safety Vessels [Member]
Number of Equipment Sold	1

Note 3 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) $ in Thousands		6 Months Ended
	Jan. 17, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total		$ 15,548	$ 28,803
Unrecorded Unconditional Purchase Obligation, Total		43,300
Equity Method Investment, Other than Temporary Impairment		1,200
Guarantor Obligations, Maximum Exposure, Undiscounted		51,600
Grant DIS [Member]
Capital Call		400
SeaCosco Offshore LLC [Member]
Number of Equipment Operated	8
Payments to Acquire Property, Plant, and Equipment, Total	$ 161,100
Unrecorded Unconditional Purchase Obligation, Total	$ 27,500	27,500
Equity Method Investment, Ownership Percentage	50.00%
Partners' Capital Account, Contributions		25,600
SEACOR Holdings [Member]
Equity Method Investment, Other than Temporary Impairment		1,200
Equity Method Investments		$ 0
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		$ 1,200

Note 4 - Long-term Debt (Details Textual) $ / shares in Units, $ in Thousands, € in Millions			6 Months Ended
	May 02, 2018 USD ($) $ / shares shares	Feb. 08, 2018 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 EUR (€)	Jun. 30, 2017 USD ($)	May 31, 2018 $ / shares	May 24, 2018 $ / shares	Dec. 31, 2017 $ / shares	Dec. 01, 2015 USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares			$ 0.01
Repayments of Long-term Debt, Total			$ 35,202		$ 3,973
Debt Instrument, Increase (Decrease), Net, Total			1,000
Other Labor and Performance Guarantee			1,700
Long-term Debt Obligation [Member]
Letters of Credit Outstanding, Amount			$ 7,900
Falcon Global Holdings [Member]
Noncontrolling Interest, Ownership Percentage by Parent			72.00%
Falcon Global USA LLC [Member]
Payments for Debtor-in-possession Obligations		$ 15,000
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
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
Warrants and Rights Outstanding, Term	25 years
Convertible Senior Notes 3.75% [Member]
Convertible Debt, Total	$ 125,000								$ 175,000
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
Debt Instrument, Unamortized Discount, Total		10,000
FGUSA Credit Facility [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		15,000
Debt Instrument, Interest Rate, Effective Percentage			6.63%
Proceeds from Lines of Credit, Total			$ 10,000
FGUSA Credit Facility [Member] \| Term Loan [Member]
Long-term Debt, Total		$ 116,100
Euro Debt [Member]
Repayments of Long-term Debt, Total			7,500
Pound Sterling Debt [Member]
Proceeds from Issuance of Long-term Debt, Total			$ 8,500

Note 5 - Income Taxes (Details Textual) $ in Millions	Dec. 31, 2017 USD ($)
Operating Loss Carryforwards, Total	$ 3.9

Note 5 - Income Taxes - Income Tax Rate Reconciliation (Details)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statutory rate	21.00%
Noncontrolling interests	(1.20%)
Foreign earnings not subject to U.S. income tax	(3.00%)
Foreign taxes not creditable against U.S. income tax	(2.40%)
Unrecognized tax benefit	5.40%
Other	0.30%
	20.10%	27.20%

Note 6 - Derivative Instruments and Hedging Strategies (Details Textual) - Interest Rate Swap [Member] € in Millions, $ in Millions	Jun. 30, 2018 USD ($)	Jun. 30, 2018 EUR (€)
Falcon Global [Member]
Derivative, Fixed Interest Rate	2.06%	2.06%
Derivative, Notional Amount	$ 53.1
OSV Partners [Member]
Derivative, Number of Instruments Held, Total	2	2
OSV Partners [Member] \| Minimum [Member]
Derivative, Fixed Interest Rate	1.89%	1.89%
OSV Partners [Member] \| Maximum [Member]
Derivative, Fixed Interest Rate	2.27%	2.27%
Derivative, Notional Amount	$ 30.4
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative, Number of Instruments Held, Total	2	2
Derivative, Fixed Interest Rate	0.03%	0.03%
Derivative, Notional Amount	$ 17.5	€ 15
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| MexMar [Member]
Derivative, Number of Instruments Held, Total	5	5
Derivative, Notional Amount	$ 104.0
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| MexMar [Member] \| Minimum [Member]
Derivative, Fixed Interest Rate	1.71%	1.71%
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| MexMar [Member] \| Maximum [Member]
Derivative, Fixed Interest Rate	2.10%	2.10%
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Sea-Cat Crewzer II [Member]
Derivative, Fixed Interest Rate	1.52%	1.52%
Derivative, Notional Amount	$ 19.7
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Sea-Cat Crewzer [Member]
Derivative, Fixed Interest Rate	1.52%	1.52%
Derivative, Notional Amount	$ 17.4

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

Jun. 30, 2018

USD ($)

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

$ 436

^[1]

Not Designated as Hedging Instrument [Member]

1,540

^[1]

Conversion option liability on Convertible Senior Notes

21,930

21,886

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

436

^[1]

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

^[2]

1,104

^[1]

^[2]

[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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Gains (losses) on derivative instruments	$ (14,184)	$ (302)
Embedded Derivative Financial Instruments [Member]
Gains (losses) on derivative instruments	(15,054)	145
Foreign Exchange Option [Member]
Gains (losses) on derivative instruments		(56)
Interest Rate Swap [Member]
Gains (losses) on derivative instruments	$ 870	$ (391)

Note 7 - Fair Value Measurements (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Impairment of Long-Lived Assets Held-for-use	$ 3.0
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
Debt Assumed from FGUSA [Member]
Long-term Debt, Total	$ 121.6

Note 7 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Fair Value, Inputs, Level 1 [Member]
Derivative assets
Construction reserve funds	38,152
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]
Derivative assets	1,541
Construction reserve funds
Derivative liabilities	44
Fair Value, Inputs, Level 3 [Member]
Derivative assets
Construction reserve funds
Derivative liabilities	$ 21,886

Note 7 - Fair Value Measurements - Estimated Fair Value (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Reported Value Measurement [Member]
Cash, cash equivalents and restricted cash	$ 88,190
Investments, at cost, in 50% or less owned companies (included in other assets)	132
Long-term debt, including current portion	371,770
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash, cash equivalents and restricted cash	88,190
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	357,742
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	Jun. 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 ($)					6 Months Ended
Note 8 - Warrants (Details Textual) - USD ($)	Jun. 08, 2018	May 31, 2018	May 02, 2018	Apr. 26, 2018	Jun. 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)	6 Months Ended
Note 8 - Warrants - Warrant Activity (Details)	Jun. 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 ($)					6 Months Ended
	May 02, 2018	Apr. 26, 2018	Mar. 26, 2018	Feb. 08, 2018	Jun. 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		6 Months Ended
	Feb. 08, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ (26,629)	$ (36,489)	$ (58,317)	$ (44,088)
Net Income (Loss) Attributable to Noncontrolling Interest, Total		$ (1,605)	$ (2,497)	$ (4,460)	$ (2,701)
Windcat Workboats [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		12.50%		12.50%
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total				$ (3,300)
Net Income (Loss) Attributable to Noncontrolling Interest, Total				(400)
Net Assets, Ending Balance		$ 17,600		17,600
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				14,400
Net Income (Loss) Attributable to Noncontrolling Interest, Total				$ 4,000

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
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+ Details

Note 10 - Noncontrolling Interests in Subsidiaries - Noncontrolling Interest (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Noncontrolling interest	$ 29,455	$ 14,975
Falcon Global [Member]
Noncontrolling interest percent	28.00%
Noncontrolling interest	$ 26,967	12,087
Windcat Workboats [Member]
Noncontrolling interest percent	12.50%
Noncontrolling interest	$ 2,201	2,608
Other Noncontrolling Interests [Member]
Noncontrolling interest percent	1.80%
Noncontrolling interest	$ 287	$ 280

Note 11 - Commitments and Contingencies (Details Textual) € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 EUR (€)
Unrecorded Unconditional Purchase Obligation, Total	$ 43.3
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	12.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	21.6
Unrecorded Unconditional Purchase Obligation, Due within Three Years	9.0
Unrecorded Unconditional Purchase Obligation, Due within Four Years	20.8
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 51.6
SEACOR Holdings [Member]
Related Party Transaction, Rate	0.50%
Line of Credit [Member] \| Performance Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted \| €		€ 0.9
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	3	3
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)	6 Months Ended
	Jun. 30, 2018 shares
Outstanding as of December 31, 2017 (in shares)	613,700
Granted (in shares)	145,991
Exercised (in shares)	65,000
Outstanding as of June 30, 2018 (in shares)	694,691
Shares Available for future grants as of June 30, 2018 (in shares)	1,270,424
Director Stock Awards [Member]
Granted (in shares)	19,285
Restricted Stock [Member]
Granted (in shares)	120,600

Note 14 - Stock Repurchases (Details Textual) - USD ($)			6 Months Ended
Note 14 - Stock Repurchases (Details Textual) - USD ($)	May 24, 2018	May 14, 2018	Jun. 30, 2018	May 31, 2018	Dec. 31, 2017
Treasury Stock, Shares, Acquired	108	2,242
Treasury Stock, Value, Acquired, Cost Method	$ 2,562	$ 51,454	$ 51,000
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	Jun. 30, 2018	Dec. 31, 2017
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 115,424	$ 92,169
MexMar [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	63,700
Other Offshore Marine Services Joint Ventures [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 51,700

Note 15 - Segment Information - Summary of Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Average Rates Per Day	$ 7,324	$ 5,649	$ 7,174	$ 5,683
Fleet Utilization	62.00%	56.00%	58.00%	51.00%
Fleet Available Days	12,528	12,363	25,129	24,130
Operating Revenues	$ 60,701	$ 42,323	$ 112,422	$ 76,627
Direct Costs and Expenses	45,980	40,792	84,328	70,580
Direct Vessel Profit	14,721	1,531	28,094	6,047
Operating expenses	36,778	40,028	71,922	67,948
Administrative and general	15,532	21,705	28,339	33,531
Depreciation and amortization	18,406	14,633	37,918	27,136
Gains (Losses) on Asset Dispositions and Impairments, Net	1,055	(6,318)	(1,588)	(1,499)
Operating Loss	(21,002)	(44,815)	(45,416)	(63,400)
Historical cost	1,287,855	1,155,155	1,287,855	1,155,155	$ 1,179,836
Accumulated depreciation	(564,477)	(543,822)	(564,477)	(543,822)	(560,160)
	723,378	611,333	723,378	611,333	$ 619,676
Leased-in Equipment [Member]
Operating expenses	2,840	3,690	5,665	7,281
Time Charter [Member]
Operating Revenues	56,826	38,803	103,968	69,533
Bareboat Charter [Member]
Operating Revenues	1,156	1,156	2,299	2,299
Other Marine Services [Member]
Operating Revenues	2,719	2,364	6,155	4,795
Personnel [Member]
Direct Costs and Expenses	24,733	20,577	46,409	37,368
Repairs and Maintenance [Member]
Direct Costs and Expenses	9,070	10,425	16,143	14,020
Drydocking [Member]
Direct Costs and Expenses	3,112	2,251	5,369	5,318
Insurance and Loss Reserves [Member]
Direct Costs and Expenses	1,934	2,126	3,124	3,685
Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	4,122	3,190	7,667	5,532
Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	3,009	2,223	5,616	4,657
UNITED STATES
Average Rates Per Day	$ 10,503	$ 9,619	$ 9,740	$ 9,808
Fleet Utilization	23.00%	13.00%	20.00%	10.00%
Fleet Available Days	3,710	4,063	7,760	8,061
Operating Revenues	$ 10,728	$ 6,087	$ 18,365	$ 9,908
Direct Costs and Expenses	8,906	7,231	15,069	12,858
Direct Vessel Profit	1,822	(1,144)	3,296	(2,950)
Administrative and general
Depreciation and amortization	5,915	5,749	12,450	11,349
Historical cost	439,026	417,675	439,026	417,675
Accumulated depreciation	(225,116)	(233,758)	(225,116)	(233,758)
	213,910	183,917	213,910	183,917
UNITED STATES \| Leased-in Equipment [Member]
Operating expenses	1,856	2,205	3,718	4,416
UNITED STATES \| Time Charter [Member]
Operating Revenues	9,052	4,889	15,034	7,884
UNITED STATES \| Bareboat Charter [Member]
Operating Revenues
UNITED STATES \| Other Marine Services [Member]
Operating Revenues	1,676	1,198	3,331	2,024
UNITED STATES \| Personnel [Member]
Direct Costs and Expenses	4,636	4,183	8,628	7,313
UNITED STATES \| Repairs and Maintenance [Member]
Direct Costs and Expenses	1,529	937	2,223	1,674
UNITED STATES \| Drydocking [Member]
Direct Costs and Expenses	910	310	1,435	883
UNITED STATES \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	902	1,205	1,336	2,010
UNITED STATES \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	900	545	1,393	855
UNITED STATES \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	29	51	54	123
Africa [Member]
Average Rates Per Day	$ 9,509	$ 10,348	$ 9,482	$ 9,913
Fleet Utilization	88.00%	67.00%	89.00%	64.00%
Fleet Available Days	1,331	1,123	2,591	2,142
Operating Revenues	$ 11,472	$ 8,001	$ 23,553	$ 14,040
Direct Costs and Expenses	9,437	9,277	16,791	14,873
Direct Vessel Profit	2,035	(1,276)	6,762	(833)
Administrative and general
Depreciation and amortization	2,924	2,059	5,731	3,649
Historical cost	184,037	183,661	184,037	183,661
Accumulated depreciation	(57,909)	(59,300)	(57,909)	(59,300)
	126,128	124,361	126,128	124,361
Africa [Member] \| Leased-in Equipment [Member]
Operating expenses	962	969	1,925	1,939
Africa [Member] \| Time Charter [Member]
Operating Revenues	11,122	7,786	21,916	13,633
Africa [Member] \| Bareboat Charter [Member]
Operating Revenues
Africa [Member] \| Other Marine Services [Member]
Operating Revenues	350	215	1,637	407
Africa [Member] \| Personnel [Member]
Direct Costs and Expenses	4,314	3,428	8,387	6,036
Africa [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	1,663	3,234	3,019	3,778
Africa [Member] \| Drydocking [Member]
Direct Costs and Expenses	910	683	912	1,740
Africa [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	248	357	466	539
Africa [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	900	704	1,569	1,263
Africa [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	1,402	871	2,438	1,517
Middle East and Asia [Member]
Average Rates Per Day	$ 8,226	$ 6,580	$ 8,155	$ 6,765
Fleet Utilization	82.00%	55.00%	74.00%	52.00%
Fleet Available Days	2,005	2,067	4,137	3,777
Operating Revenues	$ 12,799	$ 7,524	$ 24,043	$ 14,224
Direct Costs and Expenses	9,836	10,774	18,753	16,966
Direct Vessel Profit	2,963	(3,250)	5,290	(2,742)
Administrative and general
Depreciation and amortization	4,311	3,979	10,401	6,506
Historical cost	317,536	302,892	317,536	302,892
Accumulated depreciation	(86,239)	(83,880)	(86,239)	(83,880)
	231,297	219,012	231,297	219,012
Middle East and Asia [Member] \| Leased-in Equipment [Member]
Operating expenses		516		862
Middle East and Asia [Member] \| Time Charter [Member]
Operating Revenues	13,591	7,415	24,965	13,238
Middle East and Asia [Member] \| Bareboat Charter [Member]
Operating Revenues
Middle East and Asia [Member] \| Other Marine Services [Member]
Operating Revenues	(792)	109	(922)	986
Middle East and Asia [Member] \| Personnel [Member]
Direct Costs and Expenses	4,069	4,147	8,091	7,270
Middle East and Asia [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	3,576	3,947	6,004	4,523
Middle East and Asia [Member] \| Drydocking [Member]
Direct Costs and Expenses	72	358	61	516
Middle East and Asia [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	361	353	597	699
Middle East and Asia [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	922	908	1,956	1,432
Middle East and Asia [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	836	1,061	2,044	2,526
Brazil, Mexico, Central and South America [Member]
Average Rates Per Day	$ 19,127		$ 18,069
Fleet Utilization	57.00%		52.00%
Fleet Available Days	416	105	635	195
Operating Revenues	$ 6,557	$ 1,318	$ 9,184	$ 2,536
Direct Costs and Expenses	2,268	298	3,141	323
Direct Vessel Profit	4,289	1,020	6,043	2,213
Administrative and general
Depreciation and amortization	2,280	784	3,499	1,449
Historical cost	165,145	78,976	165,145	78,976
Accumulated depreciation	(58,078)	(41,565)	(58,078)	(41,565)
	107,067	37,411	107,067	37,411
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	4,556		5,930
Brazil, Mexico, Central and South America [Member] \| Bareboat Charter [Member]
Operating Revenues	1,156	1,156	2,299	2,299
Brazil, Mexico, Central and South America [Member] \| Other Marine Services [Member]
Operating Revenues	845	162	955	237
Brazil, Mexico, Central and South America [Member] \| Personnel [Member]
Direct Costs and Expenses	1,219	148	1,595	161
Brazil, Mexico, Central and South America [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	32	116	337	120
Brazil, Mexico, Central and South America [Member] \| Drydocking [Member]
Direct Costs and Expenses	11		11
Brazil, Mexico, Central and South America [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	169	4	236	11
Brazil, Mexico, Central and South America [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	349	27	414	27
Brazil, Mexico, Central and South America [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	488	3	548	4
Europe [Member]
Average Rates Per Day	$ 4,823	$ 4,176	$ 4,984	$ 4,294
Fleet Utilization	76.00%	90.00%	72.00%	81.00%
Fleet Available Days	5,066	5,005	10,006	9,955
Operating Revenues	$ 19,145	$ 19,393	$ 37,277	$ 35,919
Direct Costs and Expenses	15,533	13,212	30,574	25,560
Direct Vessel Profit	3,612	6,181	6,703	10,359
Administrative and general
Depreciation and amortization	2,976	2,062	5,837	4,183
Historical cost	182,111	171,951	182,111	171,951
Accumulated depreciation	(137,135)	(125,319)	(137,135)	(125,319)
	44,976	46,632	44,976	46,632
Europe [Member] \| Leased-in Equipment [Member]
Operating expenses	22		22	64
Europe [Member] \| Time Charter [Member]
Operating Revenues	18,505	18,713	36,123	34,778
Europe [Member] \| Bareboat Charter [Member]
Operating Revenues
Europe [Member] \| Other Marine Services [Member]
Operating Revenues	640	680	1,154	1,141
Europe [Member] \| Personnel [Member]
Direct Costs and Expenses	10,495	8,671	19,708	16,588
Europe [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,270	2,191	4,560	3,925
Europe [Member] \| Drydocking [Member]
Direct Costs and Expenses	1,209	900	2,950	2,179
Europe [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	254	207	489	426
Europe [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,051	1,006	2,335	1,955
Europe [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	$ 254	$ 237	$ 532	$ 487

Note 15 - Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity in earnings (losses) of 50% or less owned companies	$ (721)	$ 1,571	$ (513)	$ 2,009
MexMar [Member]
Equity in earnings (losses) of 50% or less owned companies	1,076	1,222	2,508	2,589
Other Offshore Marine Services Joint Ventures [Member]
Equity in earnings (losses) of 50% or less owned companies	$ (1,797)	$ 349	$ (3,021)	$ (580)