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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2018	May 09, 2018
Document Information [Line Items]
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	0001690334
Trading Symbol	smhi
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		20,020,155
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 62,738	$ 110,234
Restricted cash	2,316	2,317
Receivables:
Trade, net of allowance for doubtful accounts of $3,858 and $4,039 in 2018 and 2017, respectively	45,664	45,616
Other	17,039	12,341
Inventories	3,975	3,756
Prepaid expenses and other	3,613	3,026
Total current assets	135,345	177,290
Property and Equipment:
Historical cost	1,320,496	1,179,836
Accumulated depreciation	(580,461)	(560,160)
	740,035	619,676
Construction in progress	80,682	70,157
Net property and equipment	820,717	689,833
Investments, at Equity, and Advances to 50% or Less Owned Companies	112,219	92,169
Construction Reserve Funds	45,361	45,361
Other Assets	3,736	3,851
	1,117,378	1,008,504
Current Liabilities:
Current portion of long-term debt	22,858	22,858
Accounts payable and accrued expenses	25,551	24,024
Due to SEACOR Holdings	1,583	1,358
Accrued wages and benefits	4,958	5,087
Accrued income taxes	4,339	4,290
Accrued capital, repair and maintenance expenditures	23,818	19,618
Deferred revenues	9,430	10,104
Other current liabilities	12,820	11,879
Total current liabilities	105,357	99,218
Long-Term Debt	405,234	292,041
Conversion Option Liability on Convertible Senior Notes	18,991	6,832
Deferred Income Taxes	56,024	55,506
Deferred Gains and Other Liabilities	28,600	31,741
Total liabilities	614,206	485,338
SEACOR Marine Holdings Inc. stockholders’ equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 17,786,569 and 17,675,356 shares issued in 2018 and 2017	178	177
Additional paid-in capital	306,639	303,996
Retained earnings	175,609	216,511
Accumulated other comprehensive loss, net of tax	(10,424)	(12,493)
	472,002	508,191
Noncontrolling interest	31,170	14,975
Total equity	503,172	523,166
	$ 1,117,378	$ 1,008,504

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Trade receivables, allowance for doubtful accounts	$ 3,858	$ 4,039
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	17,786,569	17,675,356

Condensed Consolidated Statements of Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Revenues	$ 51,721	$ 34,304
Costs and Expenses:
Operating	41,173	33,379
Administrative and general	12,807	11,826
Depreciation and amortization	19,512	12,503
	73,492	57,708
Gains (Losses) on Asset Dispositions and Impairments, Net	(2,643)	4,819
Operating Loss	(24,414)	(18,585)
Other Income (Expense):
Interest income	216	850
Interest expense	(6,133)	(3,182)
SEACOR Holdings management fees		(1,925)
SEACOR Holdings guarantee fees	(12)	(76)
Marketable security gains (losses), net		11,738
Derivative gains (losses), net	(11,516)	(89)
Foreign currency losses, net	139	(189)
Other, net		(1)
	(17,306)	7,126
Loss Before Income Tax Benefit and Equity in Earnings of 50% or Less Owned Companies	(41,720)	(11,459)
Income Tax Benefit	(9,824)	(3,422)
Loss Before Equity in Earnings of 50% or Less Owned Companies	(31,896)	(8,037)
Equity in Earnings of 50% or Less Owned Companies, Net of Tax	208	438
Net Loss	(31,688)	(7,599)
Net Loss attributable to Noncontrolling Interests in Subsidiaries	(2,855)	(204)
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (28,833)	$ (7,395)
Basic and Diluted Loss Per Common Share of SEACOR Marine Holdings Inc. (in dollars per share)	$ (1.64)	$ (0.42)
Basic and Diluted Weighted Average Common Shares Outstanding: (in dollars per share)	$ 17,571,490	$ 17,671,356

Condensed Consolidated Comprehensive Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Loss	$ (31,688)	$ (7,599)
Other Comprehensive Income (Loss):
Foreign currency translation gains (losses)	1,912	919
Derivative gains (losses) on cash flow hedges	131	(9)
Other comprehensive income	2,173	1,110
Income tax (expense) benefit	(27)	(354)
Other comprehensive income, net	2,146	756
Comprehensive Loss	(29,542)	(6,843)
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries	(2,778)	(106)
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.	(26,764)	(6,737)
Interest Expense [Member]
Other Comprehensive Income (Loss):
Reclassification of derivative losses on cash flow hedges	1	12
Equity Method Investments [Member]
Other Comprehensive Income (Loss):
Reclassification of derivative losses on cash flow hedges	$ 129	$ 188

Condensed Consolidated Statement Of Changes In Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2017	$ 177	$ 303,996	$ 216,511	$ (12,493)	$ 14,975	$ 523,166
Impact of adoption of accounting principle at Dec. 31, 2017			(12,069)			(12,069)
December 31, 2017 as adjusted at Dec. 31, 2017	177	303,996	204,442	(12,493)	14,975	511,097
Issuance of common stock	1	1,792				1,793
Amortization of employee share awards		476				476
Acquisition of a consolidated joint venture					(12,037)	(12,037)
Issuance of non-controlling interests		375			31,010	31,385
Net Loss			(28,833)		(2,855)	(31,688)
Other comprehensive income				2,069	77	2,146
Balance at Mar. 31, 2018	$ 178	$ 306,639	$ 175,609	$ (10,424)	$ 31,170	$ 503,172

- Definition

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

+ References

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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net Loss	$ (31,688)	$ (7,599)
Adjustments to reconcile net loss to net cash (used in)provided by operating activities
Depreciation and amortization	19,512	12,503
Deferred financing costs amortization	237	897
Restricted stock amortization	258
Option amortization	218
Debt discount/(premium) amortization	1,494	1,109
Amortization of deferred gains against charter expense	(2,009)	(2,050)
Bad debt expense (income)	(26)	1,559
(Gain)/loss from equipment sales or retirements	2,643	(4,819)
(Gains)/losses from sale of marketable securities, net		(11,738)
Proceeds from sale of securities		51,877
Derivative (income) / losses	11,516	89
Cash settlement on derivative transactions, net	(129)	(22)
Currency (gain) / loss	(139)	189
Deferred income taxes	(11,286)	(4,503)
Equity earnings, net	(208)	(438)
Changes in Operating Assets and Liabilities:
Accounts receivables	(3,342)	4,909
Other assets	(346)	19,025
Accounts payable and accrued liabilities	1,786	4,308
Net cash (used in) provided by operating activities	(11,509)	65,296
Cash Flows from Investing Activities:
Purchases of property and equipment	(8,557)	(10,143)
Cash settlements on derivative transactions, net		(324)
Proceeds from disposition of property and equipment	282	8,297
Investments in and advances to 50% or less owned companies	(19,950)	(2,394)
Return of investments and advances from 50% or less owned companies	99	7,350
Payments received on third party notes receivable, net		1,943
Net (increase) decrease in construction reserve funds		(5,268)
Net cash used in investing activities	(28,126)	(539)
Cash Flows from Financing Activities:
Payments on long-term debt	(28,807)	(1,173)
Proceeds from issuance of long-term debt, net of issue costs	18,471	3,396
Proceeds from issuance of Common Stock	1,793
Net cash (used in) provided by financing activities	(8,543)	2,223
Effects of Exchange Rate Changes on Cash and Cash Equivalents	682	269
Net (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(47,496)	67,249
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	112,551	118,771
Cash, Cash Equivalents and Restricted Cash, End of Period	$ 65,055	$ 186,020

Note 1 - Basis of Presentation and Accounting Policies

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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 incurred (see Note

Revenue that does

not

meet these criteria is deferred until the criteria is met and are considered contract liabilities. Contract liabilities, included in other current liabilities in the accompanying condensed consolidated balance sheets, for the

three

months ended

March 31

were as follows (in thousands):

	201 8		201 7
Balance at beginning of period	$	10,104	$	6,953
Revenues deferred during the period		875		1,536
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	9,429	$	8,489

As of

March 31, 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 17, 2012,

the customer filed a voluntary petition for Chapter

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

May 19, 2012

are subject to creditors’ claims in bankruptcy court. The Company will recognize revenues when reasonably assured of a judgment in its favor. All costs and expenses related to these charters were recognized as incurred.

As of

March 31, 2018,

contract liabilities of

$2.4

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

March 31, 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

three

months ended

March 31, 2018,

capitalized interest totaled

$0.5

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

three

months ended

March 31, 2018,

the Company recognized

$2.9

million of impairment charges 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

three

months ended

March 31, 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

three

months ended

March 31, 2018,

the Company's effective income tax rate of

23.5%

was primarily due to taxes

not

provided on income attributable to noncontrolling interests, foreign sourced income

not

subject to U.S. income taxes, and a reversal of an unrecognized tax benefit. During the

three

months ended

March 31, 2017,

the Company’s effective income tax rate of

29.9%

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

three

months ended

March 31

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		(2,009)		—
Other adjustments		(25)		(2,050	)
Balance at end of period	$	22,972	$	31,860

Accumulated Other Comprehensive Income (Loss).

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

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		1,832			264			2,096			80			(3	)	$	2,173
Income tax expense		—			(27	)		(27	)		—			—			(27	)
Three Months Ended March 31, 2018	$	(11,363	)	$	939		$	(10,424	)	$	(1,277	)	$	(2	)	$	2,146

Loss Per Share.

Basic loss per common share of the Company is computed based on the weighted average number of common shares issued and outstanding during the relevant periods. Diluted loss per common share of the Company is computed based on the weighted average number of common shares 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 each of the

three

months ended

March 31, 2018

and

2017,

diluted earnings per common share of the Company excluded

4,070,500

common shares 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, diluted loss per common share of the Company excluded

94,507

shares of restricted stock and

653,700

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

New Accounting Pronouncements.

February 25, 2016,

the 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.

Note 2 - Equipment Acquisitions and Dispositions

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

2.	EQUIPMENT ACQUISITIONS AND DISPOSITIONS

During the

three

months ended

March 31, 2018,

capital expenditures were

$8.6

million. Equipment deliveries during the

three

months ended

March 31, 2018

included

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 and

two

platform supply vessels constructed through the SEACOSCO joint venture as described in Note

below.

During the

three

months ended

March 31, 2018,

the Company sold

one

fast support vessel previously retired and removed from service, property and other equipment for net proceeds of

$0.4

million (

$0.3

million in cash and

$0.1

million of previously received deposits) and gains of

$0.2

million, all of which were recognized currently.

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

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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,

and will take title to another

five

of the PSVs in

2018

and

one

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

three

months ended

March 31, 2018,

the Company and its partner each contributed additional capital of

$20.0

million in cash. The remaining committed investment will be due over the next

months as the vessel and equipment are delivered. The Company is responsible for full commercial, operational, and technical management of the vessels on a worldwide basis.

SEACOR Grant DIS.

As of

March 31, 2018,

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

$0.3

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

March 31, 2018,

the total amount guaranteed by the Company under this arrangement was

$0.4

million.

In addition, as of

March 31, 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 was

$1.4

million in the aggregate.

Note 4 - Long-term Debt

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Long-term Debt [Text Block]

4.	LONG-TERM DEBT

Convertible Senior Notes.

As of

March 31, 2018,

the Company had issued and outstanding

$175.0

million aggregate principal amount of its Convertible Senior Notes due

December 1, 2022 (

the “Convertible Senior Notes”) to affiliates of the Carlyle Group (collectively “Carlyle”). Interest on the Convertible Senior Notes is payable semi-annually on

June 15

and

December 15

of each year. The Convertible Senior Notes are convertible into shares of Common Stock. On

May 2, 2018,

certain terms of the Convertible Senior Notes were amended and the Company exchanged

$50

million in principal amount of the Convertible Senior Notes for warrants to purchase shares of Common Stock (see Note

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

6.44%

), 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 preliminary 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. The preliminary fair market valuation is subject to revision as additional information regarding the fair market value of assets and liabilities acquired becomes available. Scheduled principal payments begin in

2020.

During the quarter ending

March 31, 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.

During the

three

months ended

March 31, 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

March 31, 2018,

the Company had outstanding letters of credit for labor and performance guarantees of

$1.8

million.

Note 5 - Income Taxes

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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

three

months ended

March 31, 2018:

Statutory rate	21.0	%
Noncontrolling interests	( 1.3	)%
Foreign earnings not subject to U.S. income tax	( 3.7	)%
Foreign taxes not creditable against U.S. income tax	( 2.0	)%
Unrecognized tax benefit	9.3	%
Other	0.2	%
	23.5	%

As of

December 31, 2017,

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

$3.9

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

December 22, 2017.

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

$3.9

million and therefore the Company is removing the valuation allowance previously established against the net operating loss carryforwards.

Note 6 - Derivative Instruments and Hedging Strategies

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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

March 31, 2018

were as follows (in thousands):

	Derivative Asset (1)		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	408	$	1	(2)
		408		1
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		18,991
Interest rate swap agreements		862		14	(2)
	$	1,270	$	19,006

______________________

(

)

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

three

months ended

March 31, 2018.

As of

March 31, 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

$18.5

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

$110.8

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

$20.3

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

$18.0

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

Other Derivative Instruments.

The Company recognized gains (losses) on derivative instruments

not

designated as hedging instruments for the

three

months ended

March 31 as follows (in thousands):

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(12,159	)	$	—
Forward currency exchange, option and future contracts		—			(89	)
Interest rate swap agreements		643			—
	$	(11,516	)	$	(89	)

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

March 31, 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

$54.7

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

$33.0

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

• Dynamic Offshore had an interest rate swap agreement maturing in

2018

that calls for Dynamic Offshore to pay a fixed interest rate of

1.30%

on the amortized notional value of

$64.2

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

Note 7 - Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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

March 31, 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)	$	—	$	1,270	$	—
Construction reserve funds		45,361		—		—
LIABILITIES
Derivative instruments		—		15		18,991

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 marine transportation and energy industries.

The estimated fair values of the Company’s other financial assets and liabilities as of

March 31, 2018

were as follows (in thousands):

			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
ASSETS
Cash, cash equivalents and restricted cash	$	65,054	$	65,054	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		428,092		—		405,769		—

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 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

three

months ended

March 31, 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

three

months ended

March 31, 2018,

the Company recognized impairment charges of

$2.9

million 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.

- Definition

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 - Stockholders' Equity

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Stockholders' Equity Note Disclosure [Text Block]

8.	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.

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.

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 preliminary fair market valuation of the debt reflecting a debt discount of

$10.0

April 2018,

the Company participated in the Private Placement and in

May 2018,

the Company participated in the Exchange, each as described in note

12.

Note 9 - Noncontrolling Interest in Subsidiaries

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Noncontrolling Interest Disclosure [Text Block]

9.	NONCONTROLLING INTERESTS IN SUBSIDIARIES

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

	Noncontrolling Interests		March 31, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	28,450	$	12,087
Windcat Workboats		12.5%		2,437		2,608
Other		1.8%		283		280
			$	31,170	$	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,

$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%.

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

March 31, 2018,

the net assets of Windcat Workboats were

$19.5

million. During the

three

months ended

March 31, 2018,

the net loss of Windcat Workboats was

$1.9

million, of which

$0.2

million was attributable to noncontrolling interests.

Note 10 - Commitments and Contingencies	3 Months Ended
Note 10 - Commitments and Contingencies	Mar. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	10. COMMITMENTS AND CONTINGENCIES As of March 31, 2018, the Company’s unfunded capital commitments were $48.8 million for two fast support vessels, three supply vessels, four wind farm utility vessels, and conversions of two supply vessels to standby safety vessels. Of the amount of unfunded capital commitments, $18.8 million is payable during the remainder of 2018, $21.1 million is payable during 2019 and $8.9 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 March 31, 2018, SEACOR Holdings has guaranteed $56.5 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 11 - Segment Information

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

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 March 31, 201 8
Operating Revenues:
Time charter	$	5,982		$	10,794		$	11,374		$	1,374		$	17,618		$	47,142
Bareboat charter		—			—			—			1,143			—			1,143
Other marine services		1,655			1,287			(130)			110			514			3,436
		7,637			12,081			11,244			2,627			18,132			51,721
Direct Costs and Expenses:
Operating:
Personnel		3,992			4,073			4,022			376			9,213			21,676
Repairs and maintenance		694			1,356			2,428			305			2,290			7,073
Drydocking		525			2			(11)			—			1,741			2,257
Insurance and loss reserves		434			218			236			67			235			1,190
Fuel, lubes and supplies		493			669			1,034			65			1,284			3,545
Other		25			1,036			1,208			60			278			2,607
		6,163			7,354			8,917			873			15,041			38.348
Direct Vessel Profit	$	1,474		$	4,727		$	2,327		$	1,754		$	3,091			13,373
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,862		$	963		$	—		$	—		$	—			2,825
Administrative and general																	12,807
Depreciation and amortization	$	6,535		$	2,807		$	6,090		$	1,219		$	2,861			19,512
																	35,144
Losses on Asset Dispositions, Net																	(2,643	)
Operating Loss																$	(24,414	)

As of March 31, 201 8
Property and Equipment:
Historical cost	$	526,986		$	168,317		$	349,047		$	93,223		$	182,923		$	1,320,496
Accumulated depreciation		(236,120	)		(54,349	)		(109,601	)		(39,551	)		(140,840	)		(580,461	)
	$	290,866		$	113,968		$	239,446		$	53,672		$	42,083		$	740,035

	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 March 31, 2017
Operating Revenues:
Time charter	$	2,995		$	5,847		$	5,823		$	—		$	16,065		$	30,730
Bareboat charter		—			—			—			1,143			—			1,143
Other marine services		826			192			877			75			461			2,431
		3,821			6,039			6,700			1,218			16,526			34,304
Direct Costs and Expenses:
Operating:
Personnel		3,130			2,608			3,123			13			7,917			16,791
Repairs and maintenance		737			544			576			4			1,734			3,595
Drydocking		573			1,057			158			—			1,279			3,067
Insurance and loss reserves		805			182			346			7			219			1,559
Fuel, lubes and supplies		310			559			524			—			949			2,342
Other		72			646			1,465			1			250			2,434
		5,627			5,596			6,192			25			12,348			29,788
Direct Vessel Profit (Loss)	$	(1,806	)	$	443		$	508		$	1,193		$	4,178			4,516
Other Costs and Expenses:
Operating:
Leased-in equipment	$	2,211		$	970		$	346		$	—		$	64			3,591
Administrative and general																	11,826
Depreciation and amortization	$	5,600		$	1,590		$	2,527		$	665		$	2,121			12,503
																	27,920
Gains on Asset Dispositions, Net																	4,819
Operating Loss																$	(18,585	)

As of March 31, 2017
Property and Equipment:
Historical cost	$	433,021		$	157,835		$	274,885		$	57,744		$	165,691		$	1,089,176
Accumulated depreciation		(235,728	)		(62,359	)		(82,447	)		(35,120	)		(118,868	)		(534,522	)
	$	197,293		$	95,476		$	192,438		$	22,624		$	46,823		$	554,654

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

March 31, 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

$62.5

million and

$47.8

million, respectively. Equity in earnings (losses) of

50%

or less owned companies, net of tax for the

three

months ended

March 31

were as follows (in thousands):

	201 8		201 7
MexMar	$	1,432	$	1,367
Other		(1,224)		(929	)
	$	208	$	438

Note 12 - Subsequent Event	3 Months Ended
Note 12 - Subsequent Event	Mar. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	12. SUBSEQUENT EVENT On April 26, 2018, the Company issued an aggregate of 2,168,586 shares of Common Stock and warrants to purchase 674,164 shares of Common Stock, at an exercise price of $0.01 per share, in a private placement in reliance on the exemption from registration set forth in Section 4 (a)( 2 ) of the Securities Act (the “Private Placement”). The Company received $20.00 per share and warrant for a total of $56.9 million in gross proceeds to be used for general corporate purposes. On May 2, 2018, the Company entered into an amendment and exchange agreement with Carlyle pursuant to which: Carlyle exchanged $50 million in aggregate principal amount of the Convertible Senior Notes for warrants to purchase approximately 1.9 million shares of Common Stock, at an exercise price of $0.01 per share representing an exchange rate of 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 “Exchange”) in in reliance on the exemption from registration set forth in Section 4 (a)( 2 ) of the Securities Act; and The Company and Carlyle amended the $125.0 million in principal amount of Convertible Senior Notes that remained outstanding after 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 12 months to December 2023.

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 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

Revenues from Customers.

one

three

Revenue that does

not

three

months ended

March 31

were as follows (in thousands):

	201 8		201 7
Balance at beginning of period	$	10,104	$	6,953
Revenues deferred during the period		875		1,536
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	9,429	$	8,489

As of

March 31, 2018,

contract liabilities of

$6.8

August 17, 2012,

the customer filed a voluntary petition for Chapter

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

May 19, 2012

As of

March 31, 2018,

contract liabilities of

$2.4

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

March 31, 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

three

months ended

March 31, 2018,

capitalized interest totaled

$0.5

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

three

months ended

March 31, 2018,

the Company recognized

$2.9

million of impairment charges 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

three

months ended

March 31, 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

three

months ended

March 31, 2018,

the Company's effective income tax rate of

23.5%

was primarily due to taxes

not

provided on income attributable to noncontrolling interests, foreign sourced income

not

subject to U.S. income taxes, and a reversal of an unrecognized tax benefit. During the

three

months ended

March 31, 2017,

the Company’s effective income tax rate of

29.9%

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%

three

months ended

March 31

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		(2,009)		—
Other adjustments		(25)		(2,050	)
Balance at end of period	$	22,972	$	31,860

Comprehensive Income, Policy [Policy Text Block]

Accumulated Other Comprehensive Income (Loss).

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

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		1,832			264			2,096			80			(3	)	$	2,173
Income tax expense		—			(27	)		(27	)		—			—			(27	)
Three Months Ended March 31, 2018	$	(11,363	)	$	939		$	(10,424	)	$	(1,277	)	$	(2	)	$	2,146

Earnings Per Share, Policy [Policy Text Block]

Loss Per Share.

three

months ended

March 31, 2018

and

2017,

diluted earnings per common share of the Company excluded

4,070,500

common shares 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, diluted loss per common share of the Company excluded

94,507

shares of restricted stock and

653,700

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.

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

3 Months Ended

Mar. 31, 2018

Notes Tables

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		875		1,536
Revenues recognized during the period		(1,550)		—
Balance at end of period	$	9,429	$	8,489

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		(2,009)		—
Other adjustments		(25)		(2,050	)
Balance at end of period	$	22,972	$	31,860

Comprehensive Income (Loss) [Table Text Block]

	SEACOR Marine Holdings Inc. Stockholders’ Equity									Noncontrolling Interests
	Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Total			Foreign Currency Translation Adjustments			Derivative Income (Losses) on Cash Flow Hedges, net			Other Comprehensive Income (Loss)
December 31, 2017	$	(13,195	)	$	702		$	(12,493	)	$	(1,357	)	$	1
Other comprehensive income (loss)		1,832			264			2,096			80			(3	)	$	2,173
Income tax expense		—			(27	)		(27	)		—			—			(27	)
Three Months Ended March 31, 2018	$	(11,363	)	$	939		$	(10,424	)	$	(1,277	)	$	(2	)	$	2,146

Note 5 - Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

Statutory rate	21.0	%
Noncontrolling interests	( 1.3	)%
Foreign earnings not subject to U.S. income tax	( 3.7	)%
Foreign taxes not creditable against U.S. income tax	( 2.0	)%
Unrecognized tax benefit	9.3	%
Other	0.2	%
	23.5	%

Note 6 - Derivative Instruments and Hedging Strategies (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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)	$	408	$	1	(2)
		408		1
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		18,991
Interest rate swap agreements		862		14	(2)
	$	1,270	$	19,006

Derivatives Not Designated as Hedging Instruments [Table Text Block]

	201 8			201 7
Conversion option liability on Convertible Senior Notes	$	(12,159	)	$	—
Forward currency exchange, option and future contracts		—			(89	)
Interest rate swap agreements		643			—
	$	(11,516	)	$	(89	)

Note 7 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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)	$	—	$	1,270	$	—
Construction reserve funds		45,361		—		—
LIABILITIES
Derivative instruments		—		15		18,991

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	$	65,054	$	65,054	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		428,092		—		405,769		—

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 9 - Noncontrolling Interest in Subsidiaries (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Noncontrolling Interest [Table Text Block]

	Noncontrolling Interests		March 31, 201 8		December 31, 201 7
Falcon Global Holdings		28.0%	$	28,450	$	12,087
Windcat Workboats		12.5%		2,437		2,608
Other		1.8%		283		280
			$	31,170	$	14,975

Note 11 - Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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 March 31, 201 8
Operating Revenues:
Time charter	$	5,982		$	10,794		$	11,374		$	1,374		$	17,618		$	47,142
Bareboat charter		—			—			—			1,143			—			1,143
Other marine services		1,655			1,287			(130)			110			514			3,436
		7,637			12,081			11,244			2,627			18,132			51,721
Direct Costs and Expenses:
Operating:
Personnel		3,992			4,073			4,022			376			9,213			21,676
Repairs and maintenance		694			1,356			2,428			305			2,290			7,073
Drydocking		525			2			(11)			—			1,741			2,257
Insurance and loss reserves		434			218			236			67			235			1,190
Fuel, lubes and supplies		493			669			1,034			65			1,284			3,545
Other		25			1,036			1,208			60			278			2,607
		6,163			7,354			8,917			873			15,041			38.348
Direct Vessel Profit	$	1,474		$	4,727		$	2,327		$	1,754		$	3,091			13,373
Other Costs and Expenses:
Operating:
Leased-in equipment	$	1,862		$	963		$	—		$	—		$	—			2,825
Administrative and general																	12,807
Depreciation and amortization	$	6,535		$	2,807		$	6,090		$	1,219		$	2,861			19,512
																	35,144
Losses on Asset Dispositions, Net																	(2,643	)
Operating Loss																$	(24,414	)

As of March 31, 201 8
Property and Equipment:
Historical cost	$	526,986		$	168,317		$	349,047		$	93,223		$	182,923		$	1,320,496
Accumulated depreciation		(236,120	)		(54,349	)		(109,601	)		(39,551	)		(140,840	)		(580,461	)
	$	290,866		$	113,968		$	239,446		$	53,672		$	42,083		$	740,035

	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 March 31, 2017
Operating Revenues:
Time charter	$	2,995		$	5,847		$	5,823		$	—		$	16,065		$	30,730
Bareboat charter		—			—			—			1,143			—			1,143
Other marine services		826			192			877			75			461			2,431
		3,821			6,039			6,700			1,218			16,526			34,304
Direct Costs and Expenses:
Operating:
Personnel		3,130			2,608			3,123			13			7,917			16,791
Repairs and maintenance		737			544			576			4			1,734			3,595
Drydocking		573			1,057			158			—			1,279			3,067
Insurance and loss reserves		805			182			346			7			219			1,559
Fuel, lubes and supplies		310			559			524			—			949			2,342
Other		72			646			1,465			1			250			2,434
		5,627			5,596			6,192			25			12,348			29,788
Direct Vessel Profit (Loss)	$	(1,806	)	$	443		$	508		$	1,193		$	4,178			4,516
Other Costs and Expenses:
Operating:
Leased-in equipment	$	2,211		$	970		$	346		$	—		$	64			3,591
Administrative and general																	11,826
Depreciation and amortization	$	5,600		$	1,590		$	2,527		$	665		$	2,121			12,503
																	27,920
Gains on Asset Dispositions, Net																	4,819
Operating Loss																$	(18,585	)

As of March 31, 2017
Property and Equipment:
Historical cost	$	433,021		$	157,835		$	274,885		$	57,744		$	165,691		$	1,089,176
Accumulated depreciation		(235,728	)		(62,359	)		(82,447	)		(35,120	)		(118,868	)		(534,522	)
	$	197,293		$	95,476		$	192,438		$	22,624		$	46,823		$	554,654

Equity Method Investments [Table Text Block]

	201 8		201 7
MexMar	$	1,432	$	1,367
Other		(1,224)		(929	)
	$	208	$	438

Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 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	$ 9,429	$ 8,489	$ 10,104		$ 6,953
Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total	500
Impairment of Long-Lived Assets Held-for-use	2,900
Equity Method Investment, Other than Temporary Impairment	$ 1,200
Effective Income Tax Rate Reconciliation, Percent, Total	23.50%	29.90%
Incremental Common Shares Attributable to Conversion of Debt Securities, Total	4,070,500	4,070,500
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	94,507
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	653,700
Geographic Distribution, Domestic [Member]
Deferred Revenue	$ 6,800
Geographic Distribution, Foreign [Member]
Deferred Revenue	$ 2,400

Note 1 - Basis of Presentation and Accounting Policies - Deferred Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance at beginning of period	$ 10,104	$ 6,953
Revenues deferred during the period	875	1,536
Revenues recognized during the period	(1,550)
Balance at end of period	$ 9,429	$ 8,489

Note 1 - Basis of Presentation and Accounting Policies - Property and Equipment Useful Life (Details)	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance at beginning of period	$ 25,006	$ 33,910
Amortization of deferred gains included in operating expenses as a reduction to rental expense	(2,009)
Other adjustments	(25)	(2,050)
Balance at end of period	$ 22,972	$ 31,860

Note 1 - Basis of Presentation and Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance	$ 523,166
Other comprehensive income (loss)	2,173	$ 1,110
Income tax expense	(27)	(354)
Balance	503,172
Other comprehensive income	2,146	$ 756
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(13,195)
Other comprehensive income (loss)	1,832
Income tax expense
Balance	(11,363)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	702
Other comprehensive income (loss)	264
Income tax expense	(27)
Balance	939
AOCI Attributable to Parent [Member]
Balance	(12,493)
Other comprehensive income (loss)	2,096
Income tax expense	(27)
Balance	(10,424)
Other comprehensive income	2,069
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member]
Balance	(1,357)
Other comprehensive income (loss)	80
Income tax expense
Balance	(1,277)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Balance	1
Other comprehensive income (loss)	(3)
Income tax expense
Balance	$ (2)

Note 2 - Equipment Acquisitions and Dispositions (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Payments to Acquire Property, Plant, and Equipment, Including Fair Value Hedges	$ 8,600
Proceeds from Sale of Property, Plant, and Equipment, Including Deposits	400
Proceeds from Sale of Property, Plant, and Equipment, Total	282	$ 8,297
Proceeds from Deposits	100
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 200
Liftboats [Member]
Number of Equipment Acquired	6
Supply Vessels [Member]
Number of Equipment Sold	2
Fast Support Vessels [Member]
Number of Equipment Sold	1

Note 3 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) $ in Thousands		3 Months Ended
	Jan. 17, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total		$ 8,557	$ 10,143
Unrecorded Unconditional Purchase Obligation, Total		48,800
Equity Method Investment, Other than Temporary Impairment		1,200
Guarantor Obligations, Maximum Exposure, Undiscounted		56,500
Grant DIS [Member]
Capital Call		300
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
Partners' Capital Account, Contributions		20,000
SEACOR Holdings [Member]
Equity Method Investment, Other than Temporary Impairment		1,200
Other Offshore Marine Services Joint Ventures [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 400
Equity Method Investment, Ownership Percentage		50.00%
Allocable Share of Uncalled Capital		$ 1,400

Note 4 - Long-term Debt (Details Textual) $ in Thousands, € in Millions			3 Months Ended
	May 02, 2018 USD ($)	Feb. 08, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 2017 USD ($)
Repayments of Long-term Debt, Total			$ 28,807		$ 1,173
Debt Instrument, Increase (Decrease), Net, Total			1,000
Other Labor and Performance Guarantee			$ 1,800
Falcon Global USA LLC [Member]
Payments for Debtor-in-possession Obligations		$ 15,000
Falcon Global Holdings [Member]
Noncontrolling Interest, Ownership Percentage by Parent			72.00%
Convertible Senior Notes Converted to Warrants [Member] \| Subsequent Event [Member]
Debt Conversion, Original Debt, Amount	$ 50,000
Conversion Revolving Credit Facility from Windcat Workboats [Member]
Debt Conversion, Original Debt, Amount \| €				€ 6
Convertible Senior Notes 3.75% [Member]
Convertible Debt, Total			$ 175,000
Convertible Senior Notes 3.75% [Member] \| Subsequent Event [Member]
Convertible Debt, Total	$ 125,000
FGUSA Credit Facility [Member]
Debt Instrument, Unamortized Discount, Total		10,000
Debt Agreement, Maximum Borrowing Capacity		131,100
FGUSA Credit Facility [Member] \| Term Loan [Member]
Long-term Debt, Total		116,100
FGUSA Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument, Interest Rate, Effective Percentage			6.44%
Line of Credit Facility, Maximum Borrowing Capacity		$ 15,000
Proceeds from Lines of Credit, Total			$ 10,000
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)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statutory rate	21.00%
Noncontrolling interests	(1.30%)
Foreign earnings not subject to U.S. income tax	(3.70%)
Foreign taxes not creditable against U.S. income tax	(2.00%)
Unrecognized tax benefit	9.30%
Other	0.20%
	23.50%	29.90%

Note 6 - Derivative Instruments and Hedging Strategies (Details Textual) - Interest Rate Swap [Member] € in Millions, $ in Millions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)
Falcon Global [Member]
Derivative, Fixed Interest Rate	2.06%	2.06%
Derivative, Notional Amount	$ 54.7
OSV Partners [Member]
Derivative, Number of Instruments Held, Total	2	2
Derivative, Notional Amount	$ 33.0
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%
Dynamic Offshore [Member]
Derivative, Fixed Interest Rate	1.30%	1.30%
Derivative, Notional Amount	$ 64.2
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	$ 18.5	€ 15
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| MexMar [Member]
Derivative, Number of Instruments Held, Total	5	5
Derivative, Notional Amount	$ 110.8
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	$ 20.3
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Sea-Cat Crewzer [Member]
Derivative, Fixed Interest Rate	1.52%	1.52%
Derivative, Notional Amount	$ 18.0

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

Mar. 31, 2018

USD ($)

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

Derivative assets

$ 408

^[1]

Derivative liabilities

Not Designated as Hedging Instrument [Member]

Derivative assets

1,270

^[1]

Derivative liabilities

19,006

Conversion option liability on Convertible Senior Notes

18,991

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

Derivative assets

408

^[1]

Derivative liabilities

^[2]

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

Derivative assets

862

^[1]

Derivative liabilities

$ 14

^[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	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gains (losses) on derivative instruments	$ (11,516)	$ (89)
Foreign Exchange Option [Member]
Gains (losses) on derivative instruments		(89)
Interest Rate Swap [Member]
Gains (losses) on derivative instruments	643
Convertible Senior Notes 3.75% [Member]
Conversion option liability on Convertible Senior Notes	$ (12,159)

Note 7 - Fair Value Measurements (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Minimum [Member] \| Economic Obsolesence Factor [Member]
Property and Equipment, Measurement Input	45
Maximum [Member] \| Economic Obsolesence Factor [Member]
Property and Equipment, Measurement Input	50
Liftboats [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	25 years
Liftboats [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years
Falcon Global [Member]
Business Acquisition, Percentage of Voting Interests Acquired	2.90%
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	Mar. 31, 2018 USD ($)
Fair Value, Inputs, Level 1 [Member]
Derivative assets
Construction reserve funds	45,361
Derivative liabilities
Fair Value, Inputs, Level 2 [Member]
Derivative assets	1,270
Construction reserve funds
Derivative liabilities	15
Fair Value, Inputs, Level 3 [Member]
Derivative assets
Construction reserve funds
Derivative liabilities	$ 18,991

Note 7 - Fair Value Measurements - Estimated Fair Value (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Reported Value Measurement [Member]
Cash, cash equivalents and restricted cash	$ 65,054
Investments, at cost, in 50% or less owned companies (included in other assets)	132
Long-term debt, including current portion	428,092
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash, cash equivalents and restricted cash	65,054
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	405,769
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	Mar. 31, 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 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	Mar. 26, 2018	Feb. 08, 2018	Jan. 01, 2018	Dec. 31, 2017
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (12,069)
Stock Issued During Period, Shares, New Issues	103,213
Proceeds from Issuance of Private Placement	$ 1,800
FGUSA Credit Facility [Member]
Debt Agreement, Maximum Borrowing Capacity		$ 131,100
Debt Instrument, Unamortized Discount, Total		10,000
Falcon Global USA LLC [Member]
Payments for Debtor-in-possession Obligations		$ 15,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (12,100)	$ (12,069)

Note 9 - Noncontrolling Interest in Subsidiaries (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Feb. 08, 2018	Mar. 31, 2018	Mar. 31, 2017
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ (31,688)	$ (7,599)
Net Income (Loss) Attributable to Noncontrolling Interest, Total		$ (2,855)	$ (204)
Windcat Workboats [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		12.50%
Net Assets, Ending Balance		$ 19,500
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		1,900
Net Income (Loss) Attributable to Noncontrolling Interest, Total		$ (200)
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%

- Definition

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

+ References

+ Details

Note 9 - Noncontrolling Interest in Subsidiaries - Noncontrolling Interest (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Noncontrolling interest percent
Noncontrolling interest	$ 31,170	$ 14,975
Falcon Global [Member]
Noncontrolling interest percent	28.00%
Noncontrolling interest	$ 28,450	12,087
Windcat Workboats [Member]
Noncontrolling interest percent	12.50%
Noncontrolling interest	$ 2,437	2,608
Other Noncontrolling Interests [Member]
Noncontrolling interest percent	1.80%
Noncontrolling interest	$ 283	$ 280

Note 10 - Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Unrecorded Unconditional Purchase Obligation, Total	$ 48.8
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	18.8
Unrecorded Unconditional Purchase Obligation, Due within Two Years	21.1
Unrecorded Unconditional Purchase Obligation, Due within Three Years	8.9
Unrecorded Unconditional Purchase Obligation, Due within Four Years	20.8
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 56.5
SEACOR Holdings [Member]
Related Party Transaction, Rate	0.50%
Fast Support Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	2
Supply Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	3
Wind Farm Utility Vessel [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	4
Standby Safety Vessels [Member]
Unrecorded Unconditional Purchase Obligation, Maximum Quantity	2

Note 11 - Segment Information (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 112,219	$ 92,169
MexMar [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	62,500
Other Offshore Marine Services Joint Ventures [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	$ 47,800

Note 11 - Segment Information - Summary of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Operating Revenues	$ 51,721	$ 34,304
Direct Costs and Expenses	38,348	29,788
Direct Vessel Profit	13,373	4,516
Operating Expenses	35,144	27,920
Administrative and general	12,807	11,826
Depreciation and amortization	19,512	12,503
Losses on Asset Dispositions, Net	(2,643)	4,819
Operating Loss	(24,414)	(18,585)
Historical cost	1,320,496	1,089,176	$ 1,179,836
Accumulated depreciation	(580,461)	(534,522)	(560,160)
	740,035	554,654	$ 619,676
Leased-in Equipment [Member]
Operating Expenses	2,825	3,591
Time Charter [Member]
Operating Revenues	47,142	30,730
Bareboat Charter [Member]
Operating Revenues	1,143	1,143
Other Marine Services [Member]
Operating Revenues	3,436	2,431
Personnel [Member]
Direct Costs and Expenses	21,676	16,791
Repairs and Maintenance [Member]
Direct Costs and Expenses	7,073	3,595
Drydocking [Member]
Direct Costs and Expenses	2,257	3,067
Insurance and Loss Reserves [Member]
Direct Costs and Expenses	1,190	1,559
Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	3,545	2,342
Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	2,607	2,434
UNITED STATES
Operating Revenues	7,637	3,821
Direct Costs and Expenses	6,163	5,627
Direct Vessel Profit	1,474	(1,806)
Operating Expenses
Administrative and general
Depreciation and amortization	6,535	5,600
Losses on Asset Dispositions, Net
Operating Loss
Historical cost	526,986	433,021
Accumulated depreciation	(236,120)	(235,728)
	290,866	197,293
UNITED STATES \| Leased-in Equipment [Member]
Operating Expenses	1,862	2,211
UNITED STATES \| Time Charter [Member]
Operating Revenues	5,982	2,995
UNITED STATES \| Bareboat Charter [Member]
Operating Revenues
UNITED STATES \| Other Marine Services [Member]
Operating Revenues	1,655	826
UNITED STATES \| Personnel [Member]
Direct Costs and Expenses	3,992	3,130
UNITED STATES \| Repairs and Maintenance [Member]
Direct Costs and Expenses	694	737
UNITED STATES \| Drydocking [Member]
Direct Costs and Expenses	525	573
UNITED STATES \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	434	805
UNITED STATES \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	493	310
UNITED STATES \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	25	72
Africa [Member]
Operating Revenues	12,081	6,039
Direct Costs and Expenses	7,354	5,596
Direct Vessel Profit	4,727	443
Operating Expenses
Administrative and general
Depreciation and amortization	2,807	1,590
Losses on Asset Dispositions, Net
Operating Loss
Historical cost	168,317	157,835
Accumulated depreciation	(54,349)	(62,359)
	113,968	95,476
Africa [Member] \| Leased-in Equipment [Member]
Operating Expenses	963	970
Africa [Member] \| Time Charter [Member]
Operating Revenues	10,794	5,847
Africa [Member] \| Bareboat Charter [Member]
Operating Revenues
Africa [Member] \| Other Marine Services [Member]
Operating Revenues	1,287	192
Africa [Member] \| Personnel [Member]
Direct Costs and Expenses	4,073	2,608
Africa [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	1,356	544
Africa [Member] \| Drydocking [Member]
Direct Costs and Expenses	2	1,057
Africa [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	218	182
Africa [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	669	559
Africa [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	1,036	646
Middle East and Asia [Member]
Operating Revenues	11,244	6,700
Direct Costs and Expenses	8,917	6,192
Direct Vessel Profit	2,327	508
Operating Expenses
Administrative and general
Depreciation and amortization	6,090	2,527
Losses on Asset Dispositions, Net
Operating Loss
Historical cost	349,047	274,885
Accumulated depreciation	(109,601)	(82,447)
	239,446	192,438
Middle East and Asia [Member] \| Leased-in Equipment [Member]
Operating Expenses		346
Middle East and Asia [Member] \| Time Charter [Member]
Operating Revenues	11,374	5,823
Middle East and Asia [Member] \| Bareboat Charter [Member]
Operating Revenues
Middle East and Asia [Member] \| Other Marine Services [Member]
Operating Revenues	(130)	877
Middle East and Asia [Member] \| Personnel [Member]
Direct Costs and Expenses	4,022	3,123
Middle East and Asia [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,428	576
Middle East and Asia [Member] \| Drydocking [Member]
Direct Costs and Expenses	(11)	158
Middle East and Asia [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	236	346
Middle East and Asia [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,034	524
Middle East and Asia [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	1,208	1,465
Brazil, Mexico, Central and South America [Member]
Operating Revenues	2,627	1,218
Direct Costs and Expenses	873	25
Direct Vessel Profit	1,754	1,193
Operating Expenses
Administrative and general
Depreciation and amortization	1,219	665
Losses on Asset Dispositions, Net
Operating Loss
Historical cost	93,223	57,744
Accumulated depreciation	(39,551)	(35,120)
	53,672	22,624
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	1,374
Brazil, Mexico, Central and South America [Member] \| Bareboat Charter [Member]
Operating Revenues	1,143	1,143
Brazil, Mexico, Central and South America [Member] \| Other Marine Services [Member]
Operating Revenues	110	75
Brazil, Mexico, Central and South America [Member] \| Personnel [Member]
Direct Costs and Expenses	376	13
Brazil, Mexico, Central and South America [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	305	4
Brazil, Mexico, Central and South America [Member] \| Drydocking [Member]
Direct Costs and Expenses
Brazil, Mexico, Central and South America [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	67	7
Brazil, Mexico, Central and South America [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	65
Brazil, Mexico, Central and South America [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	60	1
Europe [Member]
Operating Revenues	18,132	16,526
Direct Costs and Expenses	15,041	12,348
Direct Vessel Profit	3,091	4,178
Operating Expenses
Administrative and general
Depreciation and amortization	2,861	2,121
Losses on Asset Dispositions, Net
Operating Loss
Historical cost	182,923	165,691
Accumulated depreciation	(140,840)	(118,868)
	42,083	46,823
Europe [Member] \| Leased-in Equipment [Member]
Operating Expenses		64
Europe [Member] \| Time Charter [Member]
Operating Revenues	17,618	16,065
Europe [Member] \| Bareboat Charter [Member]
Operating Revenues
Europe [Member] \| Other Marine Services [Member]
Operating Revenues	514	461
Europe [Member] \| Personnel [Member]
Direct Costs and Expenses	9,213	7,917
Europe [Member] \| Repairs and Maintenance [Member]
Direct Costs and Expenses	2,290	1,734
Europe [Member] \| Drydocking [Member]
Direct Costs and Expenses	1,741	1,279
Europe [Member] \| Insurance and Loss Reserves [Member]
Direct Costs and Expenses	235	219
Europe [Member] \| Fuel, Lubes and Supplies [Member]
Direct Costs and Expenses	1,284	949
Europe [Member] \| Other Direct Costs and Expenses [Member]
Direct Costs and Expenses	$ 278	$ 250

Note 11 - Segment Information - Income (Loss) in Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity in earnings (losses) of 50% or less owned companies	$ 208	$ 438
MexMar [Member]
Equity in earnings (losses) of 50% or less owned companies	1,432	1,367
Other Offshore Marine Services Joint Ventures [Member]
Equity in earnings (losses) of 50% or less owned companies	$ (1,224)	$ (929)

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References + Details

Note 12 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands			3 Months Ended
	May 02, 2018 USD ($) $ / shares shares	Apr. 26, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)
Stock Issued During Period, Value, New Issues			$ 1,793
Convertible Senior Notes 3.75% [Member]
Convertible Debt, Total			$ 175,000
Debt Instrument, Interest Rate, Stated Percentage			3.75%
Subsequent Event [Member] \| Convertible Senior Notes 3.75% [Member]
Convertible Debt, Total	$ 125,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Subsequent Event [Member] \| Convertible Senior Notes Converted to Warrants [Member]
Debt Conversion, Original Debt, Amount	$ 50,000
Subsequent Event [Member] \| Carlyle Group [Member] \| Convertible Senior Notes Converted to Warrants [Member]
Debt Conversion, Original Debt, Amount	$ 50,000
Debt Conversion, Converted Instrument, Shares Issued \| shares	1,900,000
Debt Instrument, Convertible, Conversion Ratio	0.03773
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 26.50
Subsequent Event [Member] \| Private Placement [Member]
Shares Issued, Price Per Share \| $ / shares		$ 20
Stock Issued During Period, Value, New Issues		$ 56,900
Warrants Issued in Private Placement [Member] \| Subsequent Event [Member]
Class of Warrant or Right, Outstanding \| shares		2,168,586
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 0.01
Warrant Issued for Conversion of Debt [Member] \| Subsequent Event [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 0.01