SEACOR Marine (SMHI) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 09, 2018
Document Information [Line Items]
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	1,690,334
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	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false

Condensed Consolidated Balance

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 Balance3

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 Statemen

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 Comprehe

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 Stateme6

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

Condensed Consolidated Stateme7

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

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 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 10 December 31, 2017. Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10 10 not 10 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, $0.01 May 22, 2017 ( two Recently Adopted Accounting Standards. May 2014, 2014 09, Revenue from Contracts with Customers (Topic 606 January 1, 2018 not not In November 2016, 2016 18, Statement of Cash Flows (Topic 230 , January 1, 2018. not 2016 18, Revenue Recognition. Lease Revenues . 11 Revenues from Customers. one three 11 Revenue that does not three March 31 201 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, $6.8 August 17, 2012, 11 May 19, 2012 As of March 31, 2018, $2.4 not Property and Equipment. not may As of March 31, 2018, 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 March 31, 2018, $0.5 Impairment of Long-Lived Assets. may not three March 31, 2018, $2.9 four Impairment of 50% 50% may three March 31, 2018, $1.2 one 50% Income Taxes. three March 31, 2018, 23.5% not not three March 31, 2017, 29.9% not Deferred Gains. 50% third 50% three March 31 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). 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. three March 31, 2018 2017, 4,070,500 12 94,507 653,700 New Accounting Pronouncements. February 25, 2016, January 1, 2019 not

Note 2 - Equipment Acquisitions

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 March 31, 2018, $8.6 three March 31, 2018 six 4 two 3 During the three March 31, 2018, one $0.4 $0.3 $0.1 $0.2

Note 3 - Investments, at Equity

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% SEACOSCO January 17, 2018, eight $161.1 70% two March 31, 2018, five 2018 one 2019. six 18 $27.5 50% three March 31, 2018, $20.0 14 SEACOR Grant DIS. March 31, 2018, $0.3 $1.2 Guarantees. one 50% March 31, 2018, $0.4 In addition, as of March 31, 2018, two 50% first $1.4

Note 4 - Long-term Debt

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. March 31, 2018, $175.0 December 1, 2022 ( June 15 December 15 May 2, 2018, $50 12 MOI Joint Venture. February 8, 2018, January 18, 2018, 11 February 8, 2018, $15.0 $131.1 $116.1 $15.0 6.44% 2024, two $10.0 2020. March 31, 2018, $10.0 72% Windcat. three March 31, 2018, €6.0 $7.5 $8.5 $1.0 Letters of Credit March 31, 2018, $1.8

Note 5 - Income Taxes

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 March 31, 2018: Statutory rate 21.0 % Noncontrolling interests ( )% Foreign earnings not subject to U.S. income tax ( )% Foreign taxes not creditable against U.S. income tax ( )% Unrecognized tax benefit 9.3 % Other 0.2 % 23.5 % As of December 31, 2017, $3.9 December 22, 2017. $3.9

Note 6 - Derivative Instruments

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 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 ______________________ ( 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. Cash Flow Hedges. 50% 50% three March 31, 2018. March 31, 2018, 50% • Windcat Workboats had two 2021 0.03 €15.0 $18.5 • MexMar had five 2023 1.71% 2.10% $110.8 • Sea-Cat Crewzer II had an interest rate swap agreement maturing in 2019 1.52% $20.3 • Sea-Cat Crewzer had an interest rate swap agreement maturing in 2019 1.52% $18.0 Other Derivative Instruments. not three 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 7 10 31, 2017 The Company and certain of its 50% March 31, 2018, 50% • Falcon Global International had an interest rate swap agreement maturing in 2022 2.06% $54.7 • OSV Partners had two 2020 1.89% 2.27% $33.0 • Dynamic Offshore had an interest rate swap agreement maturing in 2018 1.30% $64.2

Note 7 - Fair Value Measurement

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 may Level 1 Level 2 Level 1 not Level 3 no The Company’s financial assets and liabilities as of March 31, 2018 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 3 Level 3 The estimated fair values of the Company’s other financial assets and liabilities as of March 31, 2018 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 not 50% not The Company’s other assets and liabilities that were measured at fair value during the three March 31, 2018 Level 1 Level 2 Level 3 ASSETS Property and equipment: Anchor handling towing supply $ — $ 2,000 $ — Liftboats — — 134,775 Property and equipment three March 31, 2018, $2.9 1 Level 2 The Level 3 Level 3 two third Level 3 two 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 25 40 45% 50%.

Note 8 - Stockholders' Equity

Note 8 - Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	8. STOCKHOLDERS' EQUITY On January 1, 2018, October 24, 2016, $12.1 On March 26, 2018, 103,213 $1.8 4 2 On February 8, 2018, fifteen six $15.0 $131.1 $10.0 In April 2018, May 2018, 12.

Note 9 - Noncontrolling Interes

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. two 15 six The total capital contributed to FGH was approximately $112.5 $43.3 $18.8 28.0%. Windcat Workboats. March 31, 2018, $19.5 three March 31, 2018, $1.9 $0.2

Note 10 - Commitments and Conti

Note 10 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	10. COMMITMENTS AND CONTINGENCIES As of March 31, 2018, $48.8 two three four two $18.8 2018, $21.1 2019 $8.9 2020. $20.8 two 2018, 2019 2020 may As of March 31, 2018, $56.5 0.5% In the normal course of its business, the Company becomes involved in various other litigation matters including, among other things, claims by third not

Note 11 - Segment Information

Note 11 - Segment Information	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	11 . 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 10 December 31, 2017. 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% March 31, 2018, 50% 50% $62.5 $47.8 50% three March 31 201 8 201 7 MexMar $ 1,432 $ 1,367 Other (1,224) (929 ) $ 208 $ 438

Note 12 - Subsequent Event

Note 12 - Subsequent Event	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	12. On April 26, 2018, 2,168,586 674,164 $0.01 4 2 $20.00 $56.9 On May 2, 2018, Carlyle exchanged $50 1.9 $0.01 37.73 $1,000 $26.50 4 2 The Company and Carlyle amended the $125.0 3.75% 4.25% 12 December 2023.

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	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 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 10 December 31, 2017. Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10 10 not 10 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, $0.01 May 22, 2017 ( two
Recently Adopted Accounting Standards [Policy Text Block]	Recently Adopted Accounting Standards. May 2014, 2014 09, Revenue from Contracts with Customers (Topic 606 January 1, 2018 not not In November 2016, 2016 18, Statement of Cash Flows (Topic 230 , January 1, 2018. not 2016 18,
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition. Lease Revenues . 11 Revenues from Customers. one three 11 Revenue that does not three March 31 201 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, $6.8 August 17, 2012, 11 May 19, 2012 As of March 31, 2018, $2.4 not
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment. not may As of March 31, 2018, 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 March 31, 2018, $0.5
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets. may not three March 31, 2018, $2.9 four
Equity and Cost Method Investments, Policy [Policy Text Block]	Impairment of 50% 50% may three March 31, 2018, $1.2 one 50%
Income Tax, Policy [Policy Text Block]	Income Taxes. three March 31, 2018, 23.5% not not three March 31, 2017, 29.9% not
Deferred Gains [Policy Text Block]	Deferred Gains. 50% third 50% three March 31 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). 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 March 31, 2018 2017, 4,070,500 12 94,507 653,700
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements. February 25, 2016, January 1, 2019 not

Note 1 - Basis of Presentatio21

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)

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 ( )% Foreign earnings not subject to U.S. income tax ( )% Foreign taxes not creditable against U.S. income tax ( )% Unrecognized tax benefit 9.3 % Other 0.2 % 23.5 %

Note 6 - Derivative Instrumen23

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 Measureme24

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 Inter25

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 (

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 Presentatio27

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 Presentatio28

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 Presentatio29

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 Presentatio30

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 Presentatio31

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 Acquisitio32

Note 2 - Equipment Acquisitions and Dispositions (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
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 Equi33

Note 3 - Investments, at Equity, and Advances to 50% or Less Owned Companies (Details Textual) $ in Thousands	Jan. 17, 2018USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
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 (Detail

Note 4 - Long-term Debt (Details Textual) $ in Thousands, € in Millions	May 02, 2018USD ($)	Feb. 08, 2018USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2018EUR (€)	Mar. 31, 2017USD ($)
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

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

Note 5 - Income Taxes - Income

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 Instrumen37

Note 6 - Derivative Instruments and Hedging Strategies (Details Textual) - Interest Rate Swap [Member] € in Millions, $ in Millions	Mar. 31, 2018USD ($)	Mar. 31, 2018EUR (€)
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
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

Note 6 - Derivative Instrumen38

Note 6 - Derivative Instruments and Hedging Strategies - Derivative Instruments (Details) $ in Thousands	Mar. 31, 2018USD ($)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative assets	$ 408	[1]
Derivative liabilities	1
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	1	[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 Instrumen39

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 Measureme40

Note 7 - Fair Value Measurements (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
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 Measureme41

Note 7 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Mar. 31, 2018USD ($)
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 Measureme42

Note 7 - Fair Value Measurements - Estimated Fair Value (Details) $ in Thousands	Mar. 31, 2018USD ($)
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 Measureme43

Note 7 - Fair Value Measurements - Other Assets and Liabilities at Fair Value (Details) $ in Thousands	Mar. 31, 2018USD ($)
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 (

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 Inter45

Note 9 - Noncontrolling Interest in Subsidiaries (Details Textual) - USD ($) $ in Thousands	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%

Note 9 - Noncontrolling Inter46

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 Con47

Note 10 - Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
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 Information48

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 -

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 Information50

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)

Note 12 - Subsequent Event (Det

Note 12 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands	May 02, 2018USD ($)$ / sharesshares	Apr. 26, 2018USD ($)$ / sharesshares	Mar. 31, 2018USD ($)
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