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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	SMHI
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	0001690334
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		21,765,331
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-37966
Entity Tax Identification Number	472564547
Entity Address, Address Line One	12121 Wickchester
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77079
City Area Code	(346)
Local Phone Number	980-1700

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 58,772	$ 95,195
Restricted cash	2,240	1,657
Receivables:
Trade, net of allowance for doubtful accounts of $455 and $860 in 2019 and 2018, respectively	69,117	64,125
Other	10,410	12,082
Inventories	2,995	3,443
Prepaid expenses and other	4,123	2,530
Total current assets	147,657	179,032
Property and Equipment:
Historical cost	1,222,820	1,242,733
Accumulated depreciation	(525,556)	(561,272)
Property and equipment	697,264	681,461
Construction in progress	68,228	88,918
Net property and equipment	765,492	770,379
Right-of-Use Asset - Operating Leases	27,390
Investments, at Equity, and Advances to 50% or Less Owned Companies	112,418	121,773
Construction Reserve Funds	20,112	28,061
Other Assets	3,627	3,690
Total assets	1,076,696	1,102,935
Current Liabilities:
Current portion of operating lease liabilities	16,552
Current portion of long-term debt	20,651	16,812
Accounts payable and accrued expenses	33,909	19,370
Due to SEACOR Holdings	74	452
Accrued wages and benefits	4,625	5,025
Accrued income taxes	3,216	1,917
Deferred revenue	3,171	1,327
Accrued capital, repair and maintenance expenditures	21,805	18,886
Other current liabilities	15,776	19,828
Total current liabilities	119,779	83,617
Long-Term Operating Lease Liabilities	16,775
Long-Term Debt	379,075	387,854
Conversion Option Liability on Convertible Senior Notes	7,599	5,276
Deferred Income Taxes	37,063	44,682
Deferred Gains and Other Liabilities	5,165	26,571
Total liabilities	565,456	548,000
SEACOR Marine Holdings Inc. stockholders’ equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 21,790,974 and 20,443,215 shares issued in 2019 and 2018, respectively	218	204
Additional paid-in capital	424,549	415,372
Retained earnings	83,312	126,834
Shares held in treasury of 25,643 and 4,007, respectively, at cost	(374)	(91)
Accumulated other comprehensive loss, net of tax	(19,156)	(16,788)
Total stockholders equity	488,549	525,531
Noncontrolling interests in subsidiaries	22,691	29,404
Total equity	511,240	554,935
Total liabilities and equity	$ 1,076,696	$ 1,102,935

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Trade receivables, allowance for doubtful accounts	$ 455	$ 860
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)	21,790,974	20,443,215
Shares held in treasury (in shares)	25,643	4,007

Unaudited Condensed Consolidated Statements of Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Operating Revenues	$ 64,345	$ 60,701	$ 120,594	$ 112,422
Costs and Expenses:
Operating	43,525	46,001	87,802	84,349
Administrative and general	11,639	15,041	23,639	27,415
Lease expense	4,317	3,310	8,465	6,568
Depreciation and amortization	17,494	18,406	34,687	37,918
Costs and expenses	76,975	82,758	154,593	156,250
(Losses) Gains on Asset Dispositions and Impairments, Net	(3,848)	1,055	(3,489)	(1,588)
Operating Loss	(16,478)	(21,002)	(37,488)	(45,416)
Other Income (Expense):
Interest income	222	352	579	568
Interest expense	(7,691)	(6,489)	(15,426)	(12,622)
SEACOR Holdings guarantee fees	(32)	(7)	(61)	(19)
Derivative losses, net	(1,398)	(2,668)	(2,323)	(14,184)
Foreign currency gains, net	(929)	(818)	(294)	(679)
Nonoperating income expense	(9,828)	(9,630)	(17,525)	(26,936)
Loss Before Income Tax Benefit and Equity in Earnings of 50% or Less Owned Companies	(26,306)	(30,632)	(55,013)	(72,352)
Income Tax Benefit	(3,048)	(4,724)	(6,879)	(14,548)
Loss Before Equity in Earnings of 50% or Less Owned Companies	(23,258)	(25,908)	(48,134)	(57,804)
Equity in Losses of 50% or Less Owned Companies	(7,006)	(721)	(10,403)	(513)
Net Loss	(30,264)	(26,629)	(58,537)	(58,317)
Net Loss attributable to Noncontrolling Interests in Subsidiaries	(1,875)	(1,605)	(4,599)	(4,460)
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (28,389)	$ (25,024)	$ (53,938)	$ (53,857)
Basic and Diluted Loss Per Common Share and Warrants of SEACOR Marine Holdings Inc.	$ (1.21)	$ (1.19)	$ (2.32)	$ (2.79)
Weighted Average Common Shares and Warrants Outstanding:
Basic and Diluted	23,382,272	21,035,214	23,237,012	19,312,923

Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Loss	$ (30,264)	$ (26,629)	$ (58,537)	$ (58,317)
Other Comprehensive Loss:
Foreign currency translation losses	(1,151)	(2,785)	(276)	(873)
Derivative (losses) gains on cash flow hedges	(1,224)	(63)	(1,934)	68
Other comprehensive income	(2,517)	(2,807)	(2,541)	(634)
Income tax benefit (expense)	173	(8)	173	(35)
Other comprehensive income, net	(2,344)	(2,815)	(2,368)	(669)
Comprehensive Loss	(32,608)	(29,444)	(60,905)	(58,986)
Comprehensive Loss attributable to Noncontrolling Interests in Subsidiaries	(1,875)	(1,715)	(4,599)	(4,493)
Comprehensive Loss attributable to SEACOR Marine Holdings Inc.	(30,733)	(27,729)	(56,306)	(54,493)
Interest Expense [Member]
Other Comprehensive Loss:
Reclassification of derivative gains (losses) on cash flow hedges	128	(1)	199
Equity Method Investments [Member]
Other Comprehensive Loss:
Reclassification of derivative gains (losses) on cash flow hedges	$ (270)	$ 42	$ (530)	$ 171

Unaudited Condensed Consolidated Statements of Comprehensive Loss (Parenthetical)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Reclassification of derivative losses on cash flow hedges to equity in earnings	50.00%	50.00%	50.00%	50.00%

Unaudited Condensed Consolidated Statement of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2017	$ 523,166	$ 177	$ 303,996		$ 216,511	$ (12,493)	$ 14,975
Balance (in shares) at Dec. 31, 2017		17,675,356
Impact of adoption of new accounting standard at Dec. 31, 2017	(12,069)				(12,069)
Balance at Dec. 31, 2017	511,097	$ 177	303,996		204,442	(12,493)	14,975
Issuance of Common Stock	42,995	$ 22	42,973
Issuance of Common Stock (in shares)		2,271,799
Restricted stock grants	1	$ 1
Restricted stock grants (in shares)		120,600
Issuance of Warrants	62,809		62,809
Amortization of employee share awards	1,896		1,896
Exercise of options	813	$ 1	812
Exercise of options (in shares)		65,000
Exercise of Warrants		$ 3		$ (3)
Exercise of Warrants (in shares)		289,442		108
Restricted stock vesting	(51)			$ (51)
Restricted stock vesting (in shares)		(2,242)		2,242
Director share awards	893		893
Director share awards (in shares)		19,285
Acquisition of consolidated joint venture	(12,037)						(12,037)
Issuance of noncontrolling interests	31,385		375				31,010
Net Loss	(58,317)				(53,857)		(4,460)
Other comprehensive loss	(669)					(636)	(33)
Balance at Jun. 30, 2018	580,815	$ 204	413,754	$ (54)	150,585	(13,129)	29,455
Balance (in shares) at Jun. 30, 2018		20,439,240		2,350
Balance at Mar. 31, 2018	503,172	$ 178	306,639		175,609	(10,424)	31,170
Balance (in shares) at Mar. 31, 2018		17,786,569
Issuance of Common Stock	41,202	$ 21	41,181
Issuance of Common Stock (in shares)		2,168,586
Restricted stock grants	1	$ 1
Restricted stock grants (in shares)		112,600
Issuance of Warrants	62,809		62,809
Amortization of employee share awards	1,420		1,420
Exercise of options	813	$ 1	812
Exercise of options (in shares)		65,000
Exercise of Warrants		$ 3		$ (3)
Exercise of Warrants (in shares)		289,442		108
Restricted stock vesting	(51)			$ (51)
Restricted stock vesting (in shares)		(2,242)		2,242
Director share awards	893		893
Director share awards (in shares)		19,285
Net Loss	(26,629)				(25,024)		(1,605)
Other comprehensive loss	(2,815)					(2,705)	(110)
Balance at Jun. 30, 2018	580,815	$ 204	413,754	$ (54)	150,585	(13,129)	29,455
Balance (in shares) at Jun. 30, 2018		20,439,240		2,350
Balance at Dec. 31, 2018	$ 554,935	$ 204	415,372	$ (91)	126,834	(16,788)	29,404
Balance (in shares) at Dec. 31, 2018	20,443,215	20,439,208		4,007
Impact of adoption of new accounting standard at Dec. 31, 2018	$ 10,416				10,416
Balance at Dec. 31, 2018	565,351	$ 204	415,372	$ (91)	137,250	(16,788)	29,404
Issuance of Common Stock	6,596	$ 7	6,589
Issuance of Common Stock (in shares)		653,872
Restricted stock grants	2	$ 2
Restricted stock grants (in shares)		211,500
Amortization of employee share awards	1,589		1,589
Exercise of options	$ 108		108
Exercise of options (in shares)	8,750	8,750
Exercise of Warrants	$ 3	$ 4		$ (1)
Exercise of Warrants (in shares)		444,391		49
Restricted stock vesting	$ (284)		(2)	$ (282)
Restricted stock vesting (in shares)	(21,587)	(21,587)		21,587
Director share awards	$ 894	$ 1	893
Director share awards (in shares)		30,197
Cancellation of employee share awards (in shares)		(1,000)
Acquisition of consolidated joint venture	(2,114)						(2,114)
Net Loss	(58,537)				(53,938)		(4,599)
Other comprehensive loss	(2,368)					(2,368)
Balance at Jun. 30, 2019	$ 511,240	$ 218	424,549	$ (374)	83,312	(19,156)	22,691
Balance (in shares) at Jun. 30, 2019	21,790,974	21,765,331		25,643
Balance at Mar. 31, 2019	$ 542,123	$ 211	422,830	$ (373)	111,701	(16,812)	24,566
Balance (in shares) at Mar. 31, 2019		21,079,279		25,558
Restricted stock grants	2	$ 2
Restricted stock grants (in shares)		211,500
Amortization of employee share awards	813		813
Exercise of Warrants	3	$ 4		$ (1)
Exercise of Warrants (in shares)		444,391		49
Restricted stock vesting	(2)		(2)
Restricted stock vesting (in shares)		(36)		36
Director share awards	894	$ 1	893
Director share awards (in shares)		30,197
Cancellation of employee share awards	15		15
Net Loss	(30,264)				(28,389)		(1,875)
Other comprehensive loss	(2,344)					(2,344)
Balance at Jun. 30, 2019	$ 511,240	$ 218	$ 424,549	$ (374)	$ 83,312	$ (19,156)	$ 22,691
Balance (in shares) at Jun. 30, 2019	21,790,974	21,765,331		25,643

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net Loss	$ (58,537)	$ (58,317)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	34,687	37,918
Deferred financing costs amortization	593	501
Restricted stock amortization	1,589	1,896
Restricted stock vesting	(282)	(51)
Director share awards	894	893
Debt discount amortization	2,762	2,719
Amortization of deferred gains against charter expense		(4,019)
Bad debt (recovery) expense	(404)	10
Loss from equipment sales, retirements or impairments	3,489	1,588
Derivative losses	2,323	14,184
Cash settlement on derivative transactions, net	200	(150)
Currency losses	294	679
Deferred income taxes	(9,726)	(17,395)
Equity losses	10,403	513
Dividends received from equity investees	400	1,324
Changes in Operating Assets and Liabilities:
Accounts receivables	(5,760)	(15,414)
Other assets	(569)	(466)
Accounts payable and accrued liabilities	18,092	(99)
Net cash provided by (used in) operating activities	448	(33,686)
Cash Flows from Investing Activities:
Purchases of property and equipment	(41,184)	(15,548)
Proceeds from disposition of property and equipment	9,820	3,526
Net change in construction reserve fund	7,949	7,209
Investments in and advances to 50% or less owned companies	(2,669)	(25,560)
Return of investments and advances from 50% or less owned companies		99
Net cash (used in) investing activities	(26,084)	(30,274)
Cash Flows from Financing Activities:
Payments on long-term debt	(8,099)	(35,202)
Proceeds from issuance of long-term debt, net of issue costs		18,471
Purchase of subsidiary shares from noncontrolling interests	(3,392)
Proceeds from exercise of stock options and Warrants	111	813
Issuance of stock		42,996
Issuance of Warrants		12,809
Net cash (used in) provided by financing activities	(11,380)	39,887
Effects of Exchange Rate Changes on Cash and Cash Equivalents	1,176	(288)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(35,840)	(24,361)
Cash, Restricted Cash and Cash Equivalents, Beginning of Period	96,852	112,551
Cash, Restricted Cash and Cash Equivalents, End of Period	$ 61,012	$ 88,190

Basis of Presentation and Accounting Policies

6 Months Ended

Jun. 30, 2019

Basis Of Presentation And Accounting Policies [Abstract]

Basis of Presentation and Accounting Policies

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 10-K for the year ended December 31, 2018.

Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10-Q to the “Company” refers to SEACOR Marine Holdings Inc. and its consolidated subsidiaries and any reference in this Quarterly Report on Form 10-Q to “SEACOR Marine” refers to SEACOR Marine Holdings Inc. without its consolidated subsidiaries.

Recently Adopted Accounting Standards.

On February 25, 2016, the Financial Accounting Standards Board (“FASB”) issued a comprehensive new leasing standard, ASC 842, meant to improve 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 adopted the new standard on January 1, 2019 and applied the transition provisions of the new standard with recognition of a cumulative-effect adjustment to the opening balance of retained earnings and therefore the Company was not required to recast previously issued financial statements. The Company elected the available practical expedients permitted under the guidance including the ability to carry forward the existing lease classification, the option to not separate lease and non-lease components in calculating the right-of-use assets and corresponding lease liabilities and to not apply the recognition requirements of Topic 842 to short-term leases (leases that have a duration of twelve months or less at lease inception). For some leases, it was not possible for the Company to determine the interest rate implicit in each of its operating leases and therefore used the Company’s incremental borrowing rate in calculating operating lease right-of-use assets and lease liabilities. The Company included renewal options that were reasonably certain of being exercised in determining the lease term. Upon adoption, the Company recorded $33.7 million of right-of-use assets, $31.9 million in lease liabilities, and a cumulative-effect adjustment to the opening balance of retained earnings of $1.7 million for certain of the Company’s equipment, office and land leases. In addition, unamortized deferred gains for four vessels previously accounted for under sale-leaseback arrangements of $8.7 million, ($11.0 million deferred gains net of $2.3 million deferred taxes), were fully recognized as an adjustment to the opening balance of retained earnings.

In February 2018, the FASB issued ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”). The amendments in ASU 2018-02 permit a reclassification from Accumulated Other Comprehensive Income (“AOCI”) to retained earnings for stranded tax effects resulting from the Tax Cuts & Jobs Act (“TCJA”). Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statement users. ASU 2018-02 is effective for the Company for annual and interim reporting periods beginning after December 15, 2018. For the period ending June 30, 2019, an election has not been made to reclassify the income tax effects of the TCJA from AOCI to retained earnings.

In June 2018, the FASB issued ASU 2018-07, a new accounting standard which addresses aspects of the accounting for nonemployee share-based payment transactions. The standard is effective for interim and annual periods beginning after December 15, 2018. The adoption of the new standard by the Company did not have a material impact on its consolidated financial position or its results of operations and cash flows.

Critical Accounting Policies.

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 Company’s lease revenues are primarily from time charters and bareboat charters that are recognized ratably over the lease term as services are provided, typically on a per day basis. The charterer will take the vessel on hire for a specific period of time, use the vessel to move cargo, people or equipment and will pay the Company the agreed upon rate per day. Under a time charter the Company provides a vessel to a customer for a set term and the Company 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, including fuel, and the risk of operation (see Note 14).

Revenues from Customers of Management Services. 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 manager, the Company undertakes to use its best endeavors to provide the agreed management services as agents for, and on behalf of the ship 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 the agreed upon management services. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The majority of the ship management agreements have a duration of one to three years and are typically billed monthly. The Company 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 14).

Revenue that does not meet the aforementioned criteria is deferred until the criteria is met and are considered contract liabilities. Contract liabilities which are included in other current liabilities in the accompanying condensed consolidated balance sheets, for the six months ended June 30 were as follows (in thousands):

	2019			2018
Balance at beginning of period	$	1,327		$	10,104
Revenues deferred during the period		4,211			1,673
Revenues recognized during the period		(2,367	)		(1,550	)
Balance at end of period	$	3,171		$	10,227

As of June 30, 2019, contract liabilities include $1.6 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.

As of June 30, 2019, the Company has deferred $1.4 million received as reimbursement for upgrades of a vessel and deferred reservation fees. The amount will be recognized in revenues over time, commencing with the start of the new time charter agreement for the vessel.

The remaining balance of $0.2 million as of June 30, 2019 is comprised of contract liabilities to two customers for which collection is not reasonably assured.

Property and Equipment. Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older assets that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date.

As of June 30, 2019, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore Support Vessels:
Crew transfer vessels		10
All other offshore support vessels (excluding crew transfer vessels)		20

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

Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. During the six months ended June 30, 2019, capitalized interest totaled $0.7 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 undiscounted cash flows or appraisals, as appropriate. During the six months ended June 30, 2019, the Company recognized $5.9 million of impairment charges primarily related to two anchor-handling towing supply (“AHTS”) vessels previously removed from service, two AHTS vessels and four fast support vessels (“FSV”) which have all been adjusted to indicative sales price. During the six months ended June 30, 2018, the Company recognized $3.0 million of impairment charges primarily related to four AHTS vessels removed from service and adjusted to scrap value.

Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the six months ended June 30, 2019, the Company did not recognize any impairment charges related to its 50% or less owned companies. During the six months ended June 30, 2018, the Company recognized impairment charges of $1.2 million related to one of its 50% or less owned companies which the Company believed was unable to meet all of its liabilities.

Income Taxes. During the six months ended June 30, 2019, the Company's effective income tax rate of 12.5% was primarily due to taxes provided on income attributable to noncontrolling interests, foreign sourced income not subject to U.S. income taxes, and foreign taxes not creditable against U.S. income taxes. During the six months ended June 30, 2018, the Company’s effective income tax rate of 20.1% was primarily due to taxes provided on income attributable to noncontrolling interests, foreign sourced income not subject to U.S. income taxes, foreign taxes not creditable against U.S. income taxes, and a reversal of an unrecognized tax benefit.

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. In 2018, 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 and were amortized in operating expenses as a reduction to rental expense. The new lease accounting pronouncement which was adopted on January 1, 2019 required the recognition of unamortized gains as a cumulative-effect adjustment to the opening balance of retained earnings.

Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):

	2019			2018
Balance at beginning of period	$	11,819		$	25,006
Amortization of deferred gains included in operating expenses as a reduction to rental expense		—			(4,019	)
Impact of adoption of new accounting standard		(11,026	)		—
Other adjustments		—			(250	)
Balance at end of period	$	793		$	20,737

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, 2018	$	(15,472	)	$	(1,316	)	$	(16,788	)	$	(1,445	)	$	(11	)		—
Other comprehensive loss		(276	)		(2,092	)		(2,368	)		—			—		$	(2,368	)
Six Months Ended June 30, 2019	$	(15,748	)	$	(3,408	)	$	(19,156	)	$	(1,445	)	$	(11	)	$	(2,368	)

Leases. The Company determines if an arrangement contains a lease at the inception of a contract. Leases with contractual terms less than twelve months are not recorded on the balance sheet and lease expense is recognized on a straight-line basis over the term of the short-term lease. Leases with contractual terms longer than twelve months are categorized as either operating or finance, with corresponding right-of-use asset and lease liability recorded on the balance sheet. Finance leases are generally those leases that substantially utilize or pay for the entire asset over its estimated life. All other leases are categorized as operating leases.

Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Lease liabilities are recognized at the present value of the fixed lease payments, using an implicit discount rate if available, or if not readily available, the Company’s incremental borrowing rate. Right-of-use assets are recognized based on the initial present value of the fixed lease payments and are tested for impairment in the same manner as long-lived assets used in operations. When options exist to extend the lease term, terminate the lease before the contractual expiration date, or purchase the leased asset, and it is reasonably certain that these options will be exercised, the options are considered in determining the classification and measurement of the lease.

Loss Per Share. Basic loss per common share of the Company is computed based on the weighted average number of common shares and warrants to purchase common shares at an exercise price of $0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic loss per common share because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted loss per common share of the Company is computed based on the weighted average number of common shares and Warrants issued and outstanding plus the effect of other potentially dilutive securities through the application of the treasury stock method and the if-converted method that assumes all common shares have been issued and outstanding during the relevant periods pursuant to the conversion of the Convertible Senior Notes. For the six months ended June 30, 2019 and 2018, diluted earnings per common share of the Company excluded 2,183,708 common shares, respectively, issuable pursuant to the Company’s Convertible Senior Notes (see Note 4) as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the six months ended June 30, 2019 and 2018, diluted loss per common share of the Company excluded 340,459 and 196,338 shares of restricted stock, respectively, and 705,078 and 694,691 shares of stock, respectively, issuable upon exercise of outstanding stock options as the effect of their inclusion in the computation would be anti-dilutive.

New Accounting Pronouncements. In August 2018, the FASB issued ASU 2018-13, a new accounting standard which modifies the disclosure requirements related to fair value measurement. The new guidance is effective for fiscal years beginning after December 15, 2019. The effects of this standard on our financial position or reporting is not expected to be material.

In August 2018, the FASB issued ASU 2018-15, a new accounting standard which provided guidance regarding the accounting for fees paid by a customer in a cloud computing arrangement (hosting arrangement). The guidance reduces complexity for the accounting for costs of implementing a cloud computing service arrangement and aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The standard is effective for interim and annual periods beginning after December 15, 2019. The Company is evaluating the provisions of the standard but does not expect the adoption of the new standard to have a material impact on its consolidated financial position or its results of operations and cash flows.

In June 2016, the FASB issued ASU 2016-13, an amendment to the accounting standards which replaces the current incurred loss impairment methodology for financial assets measured at amortized cost with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information, including forecasted information, to develop credit loss estimates. The new standard is effective for interim periods beginning after December 15, 2019. Early adoption is permitted for annual periods beginning after December 15, 2018. The Company has not yet determined what impact, if any, the adoption of the new standard will have on its consolidated financial position, results of operations or cash flows.

Reclassification. Certain amounts in the prior year’s condensed consolidated financial statements have been reclassified to conform to the current year presentation. The reclassification had no impact on total assets, liabilities, or net loss.

Equipment Acquisitions and Dispositions

6 Months Ended

Jun. 30, 2019

Property Plant And Equipment [Abstract]

Equipment Acquisitions and Dispositions

2.	EQUIPMENT ACQUISITIONS AND DISPOSITIONS

During the six months ended June 30, 2019, capital acquisitions were $41.2 million. Equipment deliveries during the six months ended June 30, 2019 include two FSVs, one crew transfer vessel (“CTV”), and one platform supply vessel (“PSV”).

During the six months ended June 30, 2019, the Company sold three AHTS vessels and one specialty vessel previously retired and removed from service, one emergency response and rescue vessel (“ERRV”), two FSVs, two supply vessels and other equipment for $9.8 million cash and one vessel under construction for $4.3 million (all of which was a previously received deposit) and gains of $2.4 million.

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

6 Months Ended

Jun. 30, 2019

Schedule Of Investments [Abstract]

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

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

SEACOSCO. The Company, through SEACOR Offshore Asia LLC, an indirectly wholly owned subsidiary of SEACOR Marine (“SEACOR Offshore Asia”), owns an unconsolidated 50% interest in SEACOSCO Offshore LLC (“SEACOSCO”). China Shipping Fan Tai Limited (“CSFT”) and China Shipping Industry (Hong Kong) Co., Limited (“CSIHK”) own the other 50% interest in SEACOSCO. During the six months ended June 30, 2019, SEACOSCO took delivery of three PSVs and title to one PSV, and the Company contributed $2.0 million in capital to SEACOSCO for the payment of construction costs. In the year ended December 31, 2018, SEACOSCO took delivery of two PSVs and title to another five of the PSVs, and the Company contributed $29.6 million in capital to SEACOSCO.

During the current quarter, SEACOSCO was advised by COSCO Shipping Heavy Industry (Guangdong) Co., Ltd. (the “Shipyard”), the shipbuilder and lender under deferred payment agreements (“DPAs”) that are secured by the PSVs acquired by SEACOSCO, that SEACOSCO was in default under such agreements for two of the PSVs acquired by SEACOSCO for failure to make certain principal and interest payments in a timely manner. The Shipyard agreed to defer any action on this default pending a meeting of the board of managers of SEACOSCO to discuss capital contributions by each of the members of SEACOSCO and the settlement of the default under the DPAs.

In connection with these events, SEACOR Offshore Asia, CSFT, CSIHK and the Shipyard entered into a Memorandum of Understanding (“MOU”) effective May 31, 2019 pursuant to which (i) the Shipyard agreed to not take any action with respect to any existing defaults under the DPAs until August 31, 2019, (ii) SEACOR Offshore Asia was authorized to provide, in its sole discretion, shareholder loans to SEACOSCO and/or its subsidiaries in respect of working capital or other payment obligations at an interest rate of 15% per annum and, subject to the priority of the indebtedness under the DPAs, the shareholder loans will have senior priority to any and all other debts of SEACOSCO and/or its subsidiaries, (iii) the parties set out the non-binding principal terms and conditions for SEACOR Offshore Asia’s potential acquisition of the 50% interest in SEACOSCO owned by CSFT and CSIHK and (iv) in connection with such acquisition, SEACOR Offshore Asia or its nominee may acquire from the Shipyard two additional PSVs that had been under options held by SEACOSCO. Management remains in discussions with the Shipyard, CSFT and CSIHK with respect to the transactions contemplated by the MOU.

Mexmar Offshore International. On December 19, 2018, the Company acquired a 49% interest in Mexmar Offshore International for consideration of $4.9 million. The joint venture owns 14 vessels servicing the energy industry in Brazil. For the six months ended June 30, 2019, the joint venture has incurred losses in excess of the initial investment, and the equity investment on the Company’s books has been reduced to zero. The Company has not provided any guarantees or capital commitments with respect to this investment.

FRS Windcat Offshore Logistics GmbH. During the six months ended June 30, 2019, the Company concluded the sale of one vessel under construction for $4.3 million to a wholly owned subsidiary of FRS Windcat Offshore Logistics GmbH, an unconsolidated joint venture.

Guarantees. Two of the Company's 50% or less owned companies have bank debt secured by, among other things, a first preferred mortgage on the 50% or less owned companies’ 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 governing the companies. In such event, the Company would be required to contribute its allocable share of uncalled capital, which was, as of June 30, 2019, $0.8 million in the aggregate. This liability is included in other long-term liabilities.

Long Term Debt

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Long Term Debt

4.	LONG-TERM DEBT

The Company’s long-term debt obligations as of June 30, 2019 and December 31, 2018 were as follows (in thousands):

	June 30, 2019			December 31, 2018
Convertible Senior Notes	$	125,000		$	125,000
SEACOR Marine Foreign Holdings Syndicated Credit Facility		120,250			126,750
Falcon Global USA Term Loan Facility		109,099			109,099
Sea-Cat Crewzer III Term Loan Facility		25,366			25,989
Windcat Workboats Facilities		24,647			24,850
Falcon Global USA Revolver		15,000			15,000
SEACOR 88/888 Term Loan		11,000			11,000
BNDES Equipment Construction Finance Notes		4,308			5,284
	$	434,670		$	442,972
Portion due within one year		(20,651	)		(16,812	)
Debt discount		(29,243	)		(32,005	)
Issue costs		(5,701	)		(6,301	)
	$	379,075		$	387,854

As of June 30, 2019, the Company is in compliance with all debt covenants and lender requirements.

On August 6, 2019, SEACOR Marine, SEACOR Marine Foreign Holdings Inc., a wholly owned subsidiary of SEACOR Marine (“SMFH”), and certain vessel-owning subsidiaries of SEACOR Marine, entered into an amendment (the “Amendment”) to that certain $130.0 million loan facility, dated as of September 26, 2018, with a syndicate of lenders administered by DNB Bank ASA, New York Branch (the “Credit Facility” ) and the related guaranty by SEACOR Marine with respect to the obligations of SMFH under the Credit Facility (the “Guaranty”).

The Amendment provides for, among other things, (i) the release of one vessel from a mortgage securing the Credit Facility and the substitution of mortgages over two other vessels owned by vessel-owning subsidiaries of SEACOR Marine, and (ii) the modification of certain financial maintenance and restrictive covenants contained in the Credit Facility or the Guaranty, including with respect to asset maintenance, vessel collateral releases, EBTIDA coverage ratios and the payment of dividends and distributions.

The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Amendment, a copy of which is filed as Exhibit 10.3 hereto and the terms of which are incorporated herein by reference.

Letters of Credit. As of June 30, 2019, the Company had outstanding letters of credit of $4.3 million securing one long-term debt obligation, $0.3 million securing one lease obligation and $2.6 million for labor and performance guarantees.

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases

LEASES

As of June 30, 2019, the Company leases in four AHTS vessels, two liftboats, one FSV, one supply vessel and certain facilities and other equipment. The leases typically contain purchase and renewal options or rights of first refusal with respect to the sale or lease of the equipment. As of June 30, 2019, the remaining lease terms of the vessels have remaining durations from five to 29 months. The lease terms of the other equipment range in duration from seven to 330 months.

As of June 30, 2019, future minimum payments for operating leases for the remainder of 2019 and the years ended December 31 were as follows (in thousands):

Remainder of 2019	$	9,800
2020		14,049
2021		7,101
2022		651
2023		622
Years subsequent to 2023		4,851
		37,074
Interest component		(3,747	)
		33,327
Current portion of long-term operating lease liabilities		16,552
Long-term operating lease liabilities	$	16,775

For the six months ended June 30, 2019, the components of lease expense were as follows (in thousands):

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease expense	$	3,611	$	7,224
Short-term lease expense (lease duration of twelve months or less at lease commencement)		706		1,241
	$	4,317	$	8,465

For the six months ended June 30, 2019, other information related to operating leases were as follows (in thousands except weighted average data):

	2019
Operating cash flows from operating leases	$	9,782
Right-of-use assets obtained for operating lease liabilities	$	33,928
Weighted average remaining lease term, in years		4.7
Weighted average discount rate		4.1	%

Income Taxes

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

6.	INCOME TAXES

The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate on continuing operations for the six months ended June 30, 2019:

Statutory rate	21.0		%
Foreign taxes not creditable against U.S. income tax	(4.5	)
Foreign earnings not subject to U.S. income tax	(3.7	)
Noncontrolling interests	(2.2	)
State taxes	1.8
Other	0.1
	12.5		%

Derivative Instruments and Hedging Strategies

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Strategies

7.	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 were as follows (in thousands):

	June 30, 2019				December 31, 2018
	Derivative Asset		Derivative Liability		Derivative Asset		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	—	$	3,394	$	—	$	1,659	⁽¹⁾
		—		3,394		—		1,659
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		7,599		—		5,276
	$	—	$	10,993	$	—	$	6,935

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

Cash Flow Hedges. The Company and certain of its 50% or less owned companies have interest rate swap agreements designated as cash flow hedges. By entering into these interest rate swap agreements, the Company and its 50% or less owned companies have converted the variable LIBOR or EURIBOR component of certain of their outstanding borrowings to a fixed interest rate. The Company recognized immaterial losses on derivative instruments designated as cash flow hedges during the six months ended June 30, 2019. As of June 30, 2019, the interest rate swaps held by the Company and its 50% or less owned companies were as follows:

•

Windcat Workboats Holdings Ltd. (“Windcat Workboats”) has two interest rate swap agreements maturing in 2021 that call for the Company to pay a fixed rate of interest of (0.03%) per annum on the aggregate notional value of €15.0 million (approximately $17.0 million) and receive a variable interest rate based on EURIBOR on the aggregate notional value;

•

SEACOR Marine Foreign Holdings Inc. (“SMFH”) has an interest rate swap agreement maturing in 2023 that calls for SMFH to pay a fixed rate of interest of 3.32% per annum on the amortized notional value of $9.3 million and receive a variable interest rate based on LIBOR on the amortized notional value;

•

SMFH has an interest rate swap agreement maturing in 2023 that calls for SMFH to pay a fixed rate of interest of 3.195% per annum on the amortized notional value of $51.3 million and receive a variable interest rate based on LIBOR on the amortized notional value;

•

SEACOR 88 LLC and SEACOR 888 LLC (collectively, “SEACOR 88/888”) have an interest rate swap agreement maturing in 2023 that calls for SEACOR 88/888 to pay a fixed rate of interest of 3.2% per annum on the amortized notional value of $5.5 million and receive a variable interest rate based on LIBOR on the amortized notional value; and

•

MexMar has five interest rate swap agreements with maturities in 2023 that call for MexMar to pay a fixed rate of interest ranging from 1.71% to 2.10% per annum on the aggregate amortized notional value of $91.0 million and receive a variable interest rate based on LIBOR on the aggregate amortized notional value.

Other Derivative Instruments. The Company recognized (losses) gains on derivative instruments not designated as hedging instruments for the six months ended June 30 as follows (in thousands):

	2019			2018
Conversion option liability on Convertible Senior Notes	$	(2,323	)	$	(15,054	)
Interest rate swap agreements		—			870
	$	(2,323	)	$	(14,184	)

The conversion option liability relates to the bifurcated embedded conversion option in the Convertible Senior Notes issued to investment funds managed and controlled by the Carlyle Group (“Carlyle”). See Note 8, Fair Value Measurements.

The Company and certain of its 50% or less owned companies have entered into interest rate swap agreements that did not qualify as cash flow hedges for the general purpose of providing protection against increases in interest rates, which might lead to higher interest costs. As of June 30, 2019, these interest rate swaps held by the Company or its 50% or less owned companies were as follows:

•

SEACOR OSV Partners I LP (“OSV Partners”) has 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% to 2.27% per annum on the aggregate amortized notional value of $25.4 million and receive a variable interest rate based on LIBOR on the aggregate amortized notional value.

Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

8.	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 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1 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 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities.

The Company’s financial assets and liabilities as of June 30, 2019 that are measured at fair value on a recurring basis were as follows (in thousands):

	Level 1		Level 2		Level 3
June 30, 2019
ASSETS
Construction reserve funds	$	20,112	$	—	$	—
LIABILITIES
Derivative instruments		—		3,394		—
Conversion Option Liability on Convertible Senior Notes		—		—		7,599
December 31, 2018
ASSETS
Construction reserve funds	$	28,221	$	—	$	—
LIABILITIES
Derivative instruments		—		1,659		—
Conversion Option Liability on Convertible Senior Notes		—		—		5,276

Level 3 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 3 fair value measurement. The Company used a binomial lattice model that assumes the holders will maximize their value by finding the optimal decision between redeeming at the redemption price or converting into shares of Common Stock. This model estimates the fair value of the conversion option as the differential in the fair value of the notes including the conversion option compared with the fair value of the notes excluding the conversion option. The significant observable inputs used in the fair value measurement include the price of Common Stock and the risk-free interest rate. The significant unobservable inputs are the estimated Company credit spread and Common Stock volatility, which were based on comparable companies in the transportation and energy industries.

The estimated fair values of the Company’s other financial assets and liabilities as of June 30, 2019 were as follows (in thousands):

			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
June 30, 2019
ASSETS
Cash, cash equivalents and restricted cash	$	61,012	$	61,012	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		399,726		—		384,310		—
December 31, 2018
ASSETS
Cash, cash equivalents and restricted cash	$	96,852	$	96,852	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		404,666		—		388,949		—

The carrying value of cash, cash equivalents and restricted cash approximates fair value. The fair value of the Company’s long-term debt was estimated based upon quoted market prices or by using discounted cash flow analysis based on estimated current rates for similar types of arrangements. It was not practicable to estimate the fair value of certain of the Company’s investments, at cost, in 50% or less owned companies because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. Considerable judgment was required in developing certain of the estimates of fair value and, accordingly, the estimates presented herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange.

The Company’s other assets and liabilities that were measured at fair value during the six months ended June 30, 2019 were as follows (in thousands);

	Level 1		Level 2		Level 3
ASSETS
Property and equipment:
AHTS	$	—	$	1,210	$	—
FSVs		—		2,490		—

Property and equipment. During the six months ended June 30, 2019, the Company recognized impairment charges of $5.9 million primarily associated with certain vessels (see Note 1). The Level 2 fair values were determined based on the sales prices of similar property and equipment as scrap value.

- 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

Warrants

6 Months Ended

Jun. 30, 2019

Warrants And Rights Note Disclosure [Abstract]

Warrants

WARRANTS

On April 26, 2018, the Company closed a private placement of its Common Stock and Warrants to purchase its Common Stock (which were issued to certain investors in place of Common Stock to facilitate compliance with Jones Act restrictions) for aggregate gross proceeds of $56,855,000 (the “PIPE Private Placement”) with certain qualified institutional buyers and other accredited investors. The PIPE Private Placement included the issuance of 2,168,586 shares of Common Stock and Warrants to purchase 674,164 shares of the Common Stock at an exercise price of $0.01 per share (the “PIPE Warrants”). The PIPE Warrants were issued to Proyectos Globales de Energía y Servicios CME, S.A. de C.V. a variable capital corporation (sociedad anónima de capital variable) incorporated and existing under the laws of the United Mexican States (“CME”) on April 26, 2018, have a 25-year term and an exercise price of $0.01 per share. On May 2, 2018, the Company and Carlyle entered into an amendment and exchange agreement pursuant to which Carlyle exchanged $50.0 million in principal amount of the Convertible Senior Notes for warrants to purchase 1,886,292 shares of common stock at an exercise price of $0.01 per share (the “Exchange Warrants” and, together with the PIPE Warrants, the “Warrants”). The Exchange Warrants have a 25-year term, which commenced May 2, 2018. On May 31, 2018, June 8, 2018, May 28, 2019 and June 14, 2019, 250,693, 38,857, 380,000 and 64,440 of the PIPE Warrants were exercised, respectively for $0.01 per share, which left 1,826,966 Warrants outstanding as of June 30, 2019. In conjunction with the exercise of Warrants on June 14, 2019, 49 shares of Common Stock were withheld as payment for the exercise price of the Warrants.

Stockholders' Equity

6 Months Ended

Jun. 30, 2019

Disclosure Text Block [Abstract]

Stockholders' Equity

10.	STOCKHOLDERS' EQUITY

The impact of adopting ASC 842 resulted in an increase of $10.4 million, net of tax, to the Company’s opening retained earnings for the current period.

On January 9, 2019, certain indirect wholly-owned subsidiaries of SEACOR Marine acquired three FSVs in exchange for the private placement of 603,872 shares of its Common Stock to domestic U.S. holders affiliated with the McCall family of Louisiana. The value of the vessels and the Common Stock was $7.8 million based on the closing price of a share of Common Stock on the NYSE on the day of the exchange. The Common Stock was issued in reliance upon the exemption from registration provided by Section 4(a)(2) of the Securities Act. The Company has operated the acquired vessels for the past ten years under a revenue sharing pooling agreement that included four of its owned FSVs of similar specification. In accordance with its terms, this pooling agreement was terminated.

On January 25, 2019, Seabulk Overseas Transport, Inc. (“Seabulk Overseas”), a wholly-owned subsidiary of SEACOR Marine, acquired a 6.25% minority interest in Windcat Workboats that it did not previously own upon the exercise of certain put options by one of the two minority owners pursuant to the terms of a subscription and shareholders agreement, as amended (the “Subscription and Shareholders Agreement”), in exchange for consideration of £1.5 million (approximately $2.0 million) in cash. The Company acquired the other 6.25% minority interest in Windcat Workboats that the Company did not already own on March 15, 2019 in exchange for consideration of 50,000 shares of Common Stock and €1.2 million (approximately $1.4 million) in cash. The Common Stock was issued in a private placement in reliance upon the exemption from registration provided by Section 4(a)(2) of the Securities Act. The two acquisitions resulted in Seabulk Overseas owning (and SEACOR Marine indirectly owning) 100% of Windcat Workboats.

Noncontrolling Interests in Subsidiaries

6 Months Ended

Jun. 30, 2019

Disclosure Text Block [Abstract]

Noncontrolling Interests in Subsidiaries

11.	NONCONTROLLING INTERESTS IN SUBSIDIARIES

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

	Noncontrolling Interests		June 30, 2019		December 31, 2018
Falcon Global Holdings	28%		$	22,386	$	26,989
Windcat Workboats	0%	⁽¹⁾		—		2,115
Other	1.8%			305		300
			$	22,691	$	29,404

(1)	As of June 30, 2019; at December 31, 2018, noncontrolling interest was 12.5%.

Falcon Global Holdings. The Company consolidates Falcon Global Holdings LLC (“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. During the six months ended June 30, 2019 and 2018, the net loss of FGH was $16.6 million and $14.4 million, respectively, of which $4.6 million and $4.0 million, respectively, was attributable to noncontrolling interests.

Windcat Workboats. Prior to January 25, 2019, Seabulk Overseas, a wholly owned subsidiary of the Company, owned 87% of Windcat Workboats. On January 25, 2019, Seabulk Overseas acquired a 6.25% minority interest in Windcat Workboats that it did not previously own. Seabulk Overseas acquired the remaining 6.25% interest in Windcat Workboats that the Company did not already own on March 15, 2019. For the six months ended June 30, 2018, the net loss of Windcat Workboats was $3.3 million and $0.4 million was attributed to noncontrolling interests.

Commitment and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

12.	COMMITMENTS AND CONTINGENCIES

As of June 30, 2019, the Company’s unfunded capital commitments were $58.9 million for one FSV, two CTVs and five PSVs. Of the amount of unfunded capital commitments, $23.6 million is payable during the remainder of 2019 and $35.3 million is payable during 2020. The Company has indefinitely deferred an additional $20.6 million of orders with respect to two FSVs for which the Company had previously reported unfunded capital commitments.

As of June 30, 2019, the Company has guaranteed certain performance contracts of one of its subsidiaries by setting aside £0.9 million from its available borrowing under an unsecured line of credit. If the contract were not fulfilled, the line of credit would be drawn to fund the guarantee.

As of June 30, 2019, SEACOR Holdings Inc. (“SEACOR Holdings”) has guaranteed $32.1 million on behalf of the Company for various obligations including: performance obligations under sale-leaseback arrangements and invoiced amounts for funding deficits under the U.K. Merchant Navy Officers Pension Fund (“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.

Stock Based Compensation

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation

13.	STOCK BASED COMPENSATION

Transactions in connection with the Company's 2017 Equity Incentive Plan during the six months ended June 30, 2019 were as follows:

Restricted Stock Activity:
Outstanding as of December 31, 2018			192,346
Granted			321,100
Vested			62,387
Forfeited			1,000
Outstanding as of June 30, 2019			450,059

Stock Option Activity:
Outstanding as of December 31, 2018			805,566
Granted			149,253
Exercised			8,750
Forfeited			5,000
Outstanding as of June 30, 2019			941,069

For the six months ended June 30, 2019, the Company acquired for treasury 21,587 shares of Common Stock for an aggregate purchase price of $0.3 million from its employees to cover their tax withholding obligations upon the lapsing of restrictions on share awards. These shares were purchased in accordance with the terms of the Company's 2017 Equity Incentive Plan.

Segment Information

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Segment Information

14.	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 -K for the year ended December 31, 2018. The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands):

	United States (primarily Gulf of Mexico)		Africa (primarily West Africa)			Middle East and Asia		Latin America			Europe (primarily North Sea)		Total
For the Three Months Ended June 30, 2019
Operating Revenues:
Time charter	$	12,628	$	10,400		$	13,175	$	2,046		$	20,524	$	58,773
Bareboat charter		233		—			—		1,156			—		1,389
Other marine services		1,320		753			349		273			1,488		4,183
		14,181		11,153			13,524		3,475			22,012		64,345
Direct Costs and Expenses:
Operating:
Personnel		5,203		3,428			4,292		976			10,062		23,961
Repairs and maintenance		2,515		952			2,629		481			2,099		8,676
Drydocking		1,801		(48	)		275		(32	)		78		2,074
Insurance and loss reserves		841		239			381		66			365		1,892
Fuel, lubes and supplies		1,107		939			725		314			807		3,892
Other		113		773			793		560			791		3,030
		11,580		6,283			9,095		2,365			14,202		43,525
Direct Vessel Profit	$	2,601	$	4,870		$	4,429	$	1,110		$	7,810		20,820
Other Costs and Expenses:
Lease expense	$	2,942	$	787		$	42	$	—		$	546		4,317
Administrative and general														11,639
Depreciation and amortization		5,341		2,759			4,274		1,659			3,461		17,494
														33,450
Loss on Asset Dispositions, Net														(3,848	)
Operating Loss													$	(16,478	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Six Months Ended June 30, 2019
Operating Revenues:
Time charter	$	20,633		$	21,173		$	25,674		$	6,968		$	36,452		$	110,900
Bareboat charter		233			—			—			2,299			—			2,532
Other marine services		2,452			116			577			908			3,109			7,162
		23,318			21,289			26,251			10,175			39,561			120,594
Direct Costs and Expenses:
Operating:
Personnel		9,706			7,295			8,546			2,532			18,638			46,717
Repairs and maintenance		5,293			2,136			4,822			816			4,615			17,682
Drydocking		3,795			290			434			47			387			4,953
Insurance and loss reserves		1,433			452			708			201			572			3,366
Fuel, lubes and supplies		1,790			1,693			1,434			742			1,986			7,645
Other		203			2,879			1,893			1,081			1,383			7,439
		22,220			14,745			17,837			5,419			27,581			87,802
Direct Vessel Profit	$	1,098		$	6,544		$	8,414		$	4,756		$	11,980			32,792
Other Costs and Expenses:
Lease expense	$	5,853		$	1,572		$	88		$	1		$	951			8,465
Administrative and general																	23,639
Depreciation and amortization		10,839			5,115			8,523			3,595			6,615			34,687
																	66,791
Loss on Asset Dispositions, Net																	(3,489	)
Operating Loss																$	(37,488	)
As of June 30, 2019
Property and Equipment:
Historical cost	$	364,501		$	220,855		$	288,677		$	108,068		$	240,719		$	1,222,820
Accumulated depreciation		(189,602	)		(62,061	)		(74,815	)		(49,393	)		(149,685	)		(525,556	)
	$	174,899		$	158,794		$	213,862		$	58,675		$	91,034		$	697,264
Total Assets ⁽¹⁾	$	312,465		$	171,084		$	252,926		$	123,513		$	133,437		$	993,425

⁽¹⁾	Total assets by region does not include corporate assets of $83,271 as of June 30, 2019.

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Three Months Ended June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,503		$	9,509		$	8,226		$	19,127		$	4,823		$	7,324
Fleet Utilization		23	%		88	%		82	%		57	%		76	%		62	%
Fleet Available Days		3,710			1,331			2,005			416			5,066			12,528
Operating Revenues:
Time charter	$	9,052		$	11,122		$	13,591		$	4,556		$	18,505		$	56,826
Bareboat charter		—			—			—			1,156			—			1,156
Other		1,676			350			(792	)		845			640			2,719
		10,728			11,472			12,799			6,557			19,145			60,701
Direct Costs and Expenses:
Operating:
Personnel		4,636			4,314			4,069			1,219			10,495			24,733
Repairs and maintenance		1,529			1,663			3,576			32			2,270			9,070
Drydocking		910			910			72			11			1,209			3,112
Insurance and loss reserves		902			248			361			169			254			1,934
Fuel, lubes and supplies		900			900			922			349			1,051			4,122
Other		29			1,402			836			488			254			3,009
		8,906			9,437			9,836			2,268			15,533			45,980
Direct Vessel Profit	$	1,822		$	2,035		$	2,963		$	4,289		$	3,612			14,721
Other Costs and Expenses:
Lease expense	$	2,065		$	1,092		$	59		$	2		$	113			3,331
Administrative and general																	15,041
Depreciation and amortization		5,915			2,924			4,311			2,280			2,976			18,406
																	36,778
Gain on Asset Dispositions and Impairments, Net																	1,055
Operating Loss																$	(21,002	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Six Months Ended June 30, 2018 2018
Operating Revenues:
Time charter	$	15,034		$	21,916		$	24,965		$	5,930		$	36,123		$	103,968
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		3,331			1,637			(922	)		955			1,154			6,155
		18,365			23,553			24,043			9,184			37,277			112,422
Direct Costs and Expenses:
Operating:
Personnel		8,628			8,387			8,091			1,595			19,708			46,409
Repairs and maintenance		2,223			3,019			6,004			337			4,560			16,143
Drydocking		1,435			912			61			11			2,950			5,369
Insurance and loss reserves		1,336			466			597			236			489			3,124
Fuel, lubes and supplies		1,393			1,569			1,956			414			2,335			7,667
Other		54			2,438			2,044			548			532			5,616
		15,069			16,791			18,753			3,141			30,574			84,328
Direct Vessel Profit	$	3,296		$	6,762		$	5,290		$	6,043		$	6,703			28,094
Other Costs and Expenses:
Leased expense	$	4,109		$	2,161		$	118		$	3		$	198			6,589
Administrative and general																	27,415
Depreciation and amortization	$	12,450		$	5,731		$	10,401		$	3,499		$	5,837			37,918
																	71,922
Loss on Asset Dispositions and Impairment																	(1,588	)
Operating Loss																$	(45,416	)
As of June 30, 2018
Property and Equipment:
Historical cost	$	439,026		$	184,037		$	317,536		$	165,145		$	182,111		$	1,287,855
Accumulated depreciation		(225,116	)		(57,909	)		(86,239	)		(58,078	)		(137,135	)		(564,477	)
	$	213,910		$	126,128		$	231,297		$	107,067		$	44,976		$	723,378
Total Assets ⁽¹⁾	$	351,718		$	130,930		$	265,451		$	176,473		$	53,539		$	978,111

⁽¹⁾ Total assets by region does not include corporate assets of $154,427 as of June 30, 2018.

The Company’s investments in 50% or less owned companies, which are accounted for under the equity method, also contribute to its consolidated results of operations. As of June 30, 2019 and 2018, the Company’s investments, at equity and advances to 50% or less owned companies in its other 50% or less owned companies were $112.4 million and $115.4 million, respectively. Equity in (losses) earnings of 50% or less owned companies for the six months ended June 30, 2019 and 2018 were ($10.4) million and ($0.5) million, respectively.

Basis of Presentation and Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2019

Basis Of Presentation And Accounting Policies [Abstract]

Consolidation

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards.

Revenue Recognition

Critical Accounting Policies.

	2019			2018
Balance at beginning of period	$	1,327		$	10,104
Revenues deferred during the period		4,211			1,673
Revenues recognized during the period		(2,367	)		(1,550	)
Balance at end of period	$	3,171		$	10,227

The remaining balance of $0.2 million as of June 30, 2019 is comprised of contract liabilities to two customers for which collection is not reasonably assured.

Property and Equipment

As of June 30, 2019, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore Support Vessels:
Crew transfer vessels		10
All other offshore support vessels (excluding crew transfer vessels)		20

Impairment of Long-Lived Assets and 50% or Less Owned Companies

Income Taxes

Deferred Gains

Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):

	2019			2018
Balance at beginning of period	$	11,819		$	25,006
Amortization of deferred gains included in operating expenses as a reduction to rental expense		—			(4,019	)
Impact of adoption of new accounting standard		(11,026	)		—
Other adjustments		—			(250	)
Balance at end of period	$	793		$	20,737

Accumulated Other Comprehensive Income (Loss)

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, 2018	$	(15,472	)	$	(1,316	)	$	(16,788	)	$	(1,445	)	$	(11	)		—
Other comprehensive loss		(276	)		(2,092	)		(2,368	)		—			—		$	(2,368	)
Six Months Ended June 30, 2019	$	(15,748	)	$	(3,408	)	$	(19,156	)	$	(1,445	)	$	(11	)	$	(2,368	)

Leases

Loss Per Share

New Accounting Pronouncements

Basis of Presentation and Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Basis Of Presentation And Accounting Policies [Abstract]

Schedule of Deferred Revenues

	2019			2018
Balance at beginning of period	$	1,327		$	10,104
Revenues deferred during the period		4,211			1,673
Revenues recognized during the period		(2,367	)		(1,550	)
Balance at end of period	$	3,171		$	10,227

Schedule of Property and Equipment Useful Life

As of June 30, 2019, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore Support Vessels:
Crew transfer vessels		10
All other offshore support vessels (excluding crew transfer vessels)		20

Schedule of Deferred Gain Activity

Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):

	2019			2018
Balance at beginning of period	$	11,819		$	25,006
Amortization of deferred gains included in operating expenses as a reduction to rental expense		—			(4,019	)
Impact of adoption of new accounting standard		(11,026	)		—
Other adjustments		—			(250	)
Balance at end of period	$	793		$	20,737

Schedule of Accumulated Other Comprehensive Loss

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, 2018	$	(15,472	)	$	(1,316	)	$	(16,788	)	$	(1,445	)	$	(11	)		—
Other comprehensive loss		(276	)		(2,092	)		(2,368	)		—			—		$	(2,368	)
Six Months Ended June 30, 2019	$	(15,748	)	$	(3,408	)	$	(19,156	)	$	(1,445	)	$	(11	)	$	(2,368	)

Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Obligations

The Company’s long-term debt obligations as of June 30, 2019 and December 31, 2018 were as follows (in thousands):

	June 30, 2019			December 31, 2018
Convertible Senior Notes	$	125,000		$	125,000
SEACOR Marine Foreign Holdings Syndicated Credit Facility		120,250			126,750
Falcon Global USA Term Loan Facility		109,099			109,099
Sea-Cat Crewzer III Term Loan Facility		25,366			25,989
Windcat Workboats Facilities		24,647			24,850
Falcon Global USA Revolver		15,000			15,000
SEACOR 88/888 Term Loan		11,000			11,000
BNDES Equipment Construction Finance Notes		4,308			5,284
	$	434,670		$	442,972
Portion due within one year		(20,651	)		(16,812	)
Debt discount		(29,243	)		(32,005	)
Issue costs		(5,701	)		(6,301	)
	$	379,075		$	387,854

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Summary of Future Minimum Payments For Operating Leases

As of June 30, 2019, future minimum payments for operating leases for the remainder of 2019 and the years ended December 31 were as follows (in thousands):

Remainder of 2019	$	9,800
2020		14,049
2021		7,101
2022		651
2023		622
Years subsequent to 2023		4,851
		37,074
Interest component		(3,747	)
		33,327
Current portion of long-term operating lease liabilities		16,552
Long-term operating lease liabilities	$	16,775

Summary of Components of Leases Expense

For the six months ended June 30, 2019, the components of lease expense were as follows (in thousands):

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease expense	$	3,611	$	7,224
Short-term lease expense (lease duration of twelve months or less at lease commencement)		706		1,241
	$	4,317	$	8,465

Summary of Other Information Related to Operating Leases

For the six months ended June 30, 2019, other information related to operating leases were as follows (in thousands except weighted average data):

	2019
Operating cash flows from operating leases	$	9,782
Right-of-use assets obtained for operating lease liabilities	$	33,928
Weighted average remaining lease term, in years		4.7
Weighted average discount rate		4.1	%

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

Statutory rate	21.0		%
Foreign taxes not creditable against U.S. income tax	(4.5	)
Foreign earnings not subject to U.S. income tax	(3.7	)
Noncontrolling interests	(2.2	)
State taxes	1.8
Other	0.1
	12.5		%

Derivative Instruments and Hedging Strategies (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Assets and Liabilities

The fair values of the Company’s derivative instruments were as follows (in thousands):

	June 30, 2019				December 31, 2018
	Derivative Asset		Derivative Liability		Derivative Asset		Derivative Liability
Derivatives designated as hedging instruments:
Interest rate swap agreements (cash flow hedges)	$	—	$	3,394	$	—	$	1,659	⁽¹⁾
		—		3,394		—		1,659
Derivatives not designated as hedging instruments:
Conversion option liability on Convertible Senior Notes		—		7,599		—		5,276
	$	—	$	10,993	$	—	$	6,935

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

Schedule of (Losses) Gains on Derivative Instruments not Designated as Hedging Instruments

The Company recognized (losses) gains on derivative instruments not designated as hedging instruments for the six months ended June 30 as follows (in thousands):

	2019			2018
Conversion option liability on Convertible Senior Notes	$	(2,323	)	$	(15,054	)
Interest rate swap agreements		—			870
	$	(2,323	)	$	(14,184	)

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis

The Company’s financial assets and liabilities as of June 30, 2019 that are measured at fair value on a recurring basis were as follows (in thousands):

	Level 1		Level 2		Level 3
June 30, 2019
ASSETS
Construction reserve funds	$	20,112	$	—	$	—
LIABILITIES
Derivative instruments		—		3,394		—
Conversion Option Liability on Convertible Senior Notes		—		—		7,599
December 31, 2018
ASSETS
Construction reserve funds	$	28,221	$	—	$	—
LIABILITIES
Derivative instruments		—		1,659		—
Conversion Option Liability on Convertible Senior Notes		—		—		5,276

Schedule of Estimated Fair Values of Financial Assets and Liabilities

The estimated fair values of the Company’s other financial assets and liabilities as of June 30, 2019 were as follows (in thousands):

			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
June 30, 2019
ASSETS
Cash, cash equivalents and restricted cash	$	61,012	$	61,012	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		399,726		—		384,310		—
December 31, 2018
ASSETS
Cash, cash equivalents and restricted cash	$	96,852	$	96,852	$	—	$	—
Investments, at cost, in 50% or less owned companies (included in other assets)		132	see below
LIABILITIES
Long-term debt, including current portion		404,666		—		388,949		—

Schedule of Other Assets and Liabilities Measured at Fair Value

The Company’s other assets and liabilities that were measured at fair value during the six months ended June 30, 2019 were as follows (in thousands);

	Level 1		Level 2		Level 3
ASSETS
Property and equipment:
AHTS	$	—	$	1,210	$	—
FSVs		—		2,490		—

Noncontrolling Interests in Subsidiaries (Tables)

6 Months Ended

Jun. 30, 2019

Table [Text Block]

Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries

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

	Noncontrolling Interests		June 30, 2019		December 31, 2018
Falcon Global Holdings	28%		$	22,386	$	26,989
Windcat Workboats	0%	⁽¹⁾		—		2,115
Other	1.8%			305		300
			$	22,691	$	29,404

(1)	As of June 30, 2019; at December 31, 2018, noncontrolling interest was 12.5%.

Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Transactions in Connection with 2017 Equity Incentive Plan

Transactions in connection with the Company's 2017 Equity Incentive Plan during the six months ended June 30, 2019 were as follows:

Restricted Stock Activity:
Outstanding as of December 31, 2018			192,346
Granted			321,100
Vested			62,387
Forfeited			1,000
Outstanding as of June 30, 2019			450,059

Stock Option Activity:
Outstanding as of December 31, 2018			805,566
Granted			149,253
Exercised			8,750
Forfeited			5,000
Outstanding as of June 30, 2019			941,069

Segment Information (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

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

	United States (primarily Gulf of Mexico)		Africa (primarily West Africa)			Middle East and Asia		Latin America			Europe (primarily North Sea)		Total
For the Three Months Ended June 30, 2019
Operating Revenues:
Time charter	$	12,628	$	10,400		$	13,175	$	2,046		$	20,524	$	58,773
Bareboat charter		233		—			—		1,156			—		1,389
Other marine services		1,320		753			349		273			1,488		4,183
		14,181		11,153			13,524		3,475			22,012		64,345
Direct Costs and Expenses:
Operating:
Personnel		5,203		3,428			4,292		976			10,062		23,961
Repairs and maintenance		2,515		952			2,629		481			2,099		8,676
Drydocking		1,801		(48	)		275		(32	)		78		2,074
Insurance and loss reserves		841		239			381		66			365		1,892
Fuel, lubes and supplies		1,107		939			725		314			807		3,892
Other		113		773			793		560			791		3,030
		11,580		6,283			9,095		2,365			14,202		43,525
Direct Vessel Profit	$	2,601	$	4,870		$	4,429	$	1,110		$	7,810		20,820
Other Costs and Expenses:
Lease expense	$	2,942	$	787		$	42	$	—		$	546		4,317
Administrative and general														11,639
Depreciation and amortization		5,341		2,759			4,274		1,659			3,461		17,494
														33,450
Loss on Asset Dispositions, Net														(3,848	)
Operating Loss													$	(16,478	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Six Months Ended June 30, 2019
Operating Revenues:
Time charter	$	20,633		$	21,173		$	25,674		$	6,968		$	36,452		$	110,900
Bareboat charter		233			—			—			2,299			—			2,532
Other marine services		2,452			116			577			908			3,109			7,162
		23,318			21,289			26,251			10,175			39,561			120,594
Direct Costs and Expenses:
Operating:
Personnel		9,706			7,295			8,546			2,532			18,638			46,717
Repairs and maintenance		5,293			2,136			4,822			816			4,615			17,682
Drydocking		3,795			290			434			47			387			4,953
Insurance and loss reserves		1,433			452			708			201			572			3,366
Fuel, lubes and supplies		1,790			1,693			1,434			742			1,986			7,645
Other		203			2,879			1,893			1,081			1,383			7,439
		22,220			14,745			17,837			5,419			27,581			87,802
Direct Vessel Profit	$	1,098		$	6,544		$	8,414		$	4,756		$	11,980			32,792
Other Costs and Expenses:
Lease expense	$	5,853		$	1,572		$	88		$	1		$	951			8,465
Administrative and general																	23,639
Depreciation and amortization		10,839			5,115			8,523			3,595			6,615			34,687
																	66,791
Loss on Asset Dispositions, Net																	(3,489	)
Operating Loss																$	(37,488	)
As of June 30, 2019
Property and Equipment:
Historical cost	$	364,501		$	220,855		$	288,677		$	108,068		$	240,719		$	1,222,820
Accumulated depreciation		(189,602	)		(62,061	)		(74,815	)		(49,393	)		(149,685	)		(525,556	)
	$	174,899		$	158,794		$	213,862		$	58,675		$	91,034		$	697,264
Total Assets ⁽¹⁾	$	312,465		$	171,084		$	252,926		$	123,513		$	133,437		$	993,425

⁽¹⁾	Total assets by region does not include corporate assets of $83,271 as of June 30, 2019.

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Three Months Ended June 30, 2018
Time Charter Statistics:
Average Rates Per Day	$	10,503		$	9,509		$	8,226		$	19,127		$	4,823		$	7,324
Fleet Utilization		23	%		88	%		82	%		57	%		76	%		62	%
Fleet Available Days		3,710			1,331			2,005			416			5,066			12,528
Operating Revenues:
Time charter	$	9,052		$	11,122		$	13,591		$	4,556		$	18,505		$	56,826
Bareboat charter		—			—			—			1,156			—			1,156
Other		1,676			350			(792	)		845			640			2,719
		10,728			11,472			12,799			6,557			19,145			60,701
Direct Costs and Expenses:
Operating:
Personnel		4,636			4,314			4,069			1,219			10,495			24,733
Repairs and maintenance		1,529			1,663			3,576			32			2,270			9,070
Drydocking		910			910			72			11			1,209			3,112
Insurance and loss reserves		902			248			361			169			254			1,934
Fuel, lubes and supplies		900			900			922			349			1,051			4,122
Other		29			1,402			836			488			254			3,009
		8,906			9,437			9,836			2,268			15,533			45,980
Direct Vessel Profit	$	1,822		$	2,035		$	2,963		$	4,289		$	3,612			14,721
Other Costs and Expenses:
Lease expense	$	2,065		$	1,092		$	59		$	2		$	113			3,331
Administrative and general																	15,041
Depreciation and amortization		5,915			2,924			4,311			2,280			2,976			18,406
																	36,778
Gain on Asset Dispositions and Impairments, Net																	1,055
Operating Loss																$	(21,002	)

	United States (primarily Gulf of Mexico)			Africa (primarily West Africa)			Middle East and Asia			Latin America			Europe (primarily North Sea)			Total
For the Six Months Ended June 30, 2018 2018
Operating Revenues:
Time charter	$	15,034		$	21,916		$	24,965		$	5,930		$	36,123		$	103,968
Bareboat charter		—			—			—			2,299			—			2,299
Other marine services		3,331			1,637			(922	)		955			1,154			6,155
		18,365			23,553			24,043			9,184			37,277			112,422
Direct Costs and Expenses:
Operating:
Personnel		8,628			8,387			8,091			1,595			19,708			46,409
Repairs and maintenance		2,223			3,019			6,004			337			4,560			16,143
Drydocking		1,435			912			61			11			2,950			5,369
Insurance and loss reserves		1,336			466			597			236			489			3,124
Fuel, lubes and supplies		1,393			1,569			1,956			414			2,335			7,667
Other		54			2,438			2,044			548			532			5,616
		15,069			16,791			18,753			3,141			30,574			84,328
Direct Vessel Profit	$	3,296		$	6,762		$	5,290		$	6,043		$	6,703			28,094
Other Costs and Expenses:
Leased expense	$	4,109		$	2,161		$	118		$	3		$	198			6,589
Administrative and general																	27,415
Depreciation and amortization	$	12,450		$	5,731		$	10,401		$	3,499		$	5,837			37,918
																	71,922
Loss on Asset Dispositions and Impairment																	(1,588	)
Operating Loss																$	(45,416	)
As of June 30, 2018
Property and Equipment:
Historical cost	$	439,026		$	184,037		$	317,536		$	165,145		$	182,111		$	1,287,855
Accumulated depreciation		(225,116	)		(57,909	)		(86,239	)		(58,078	)		(137,135	)		(564,477	)
	$	213,910		$	126,128		$	231,297		$	107,067		$	44,976		$	723,378
Total Assets ⁽¹⁾	$	351,718		$	130,930		$	265,451		$	176,473		$	53,539		$	978,111

⁽¹⁾ Total assets by region does not include corporate assets of $154,427 as of June 30, 2018.

Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Basis Of Presentation And Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset		$ 27,390
Operating Lease, Liability		33,327
Impact of adoption of new accounting standard		11,026
Cumulative Effect on Retained Earnings, Tax		(9,726)	$ (17,395)
Contract with customer, liability		3,171	10,227	$ 1,327	$ 10,104
Capitalized interest costs, including allowance for funds used during construction, total		700
Impairment of long-lived assets held-for-use		5,900	$ 3,000
Equity method investment, other than temporary impairment		$ 1,200
Effective income tax rate reconciliation, percent, total		12.50%	20.10%
Class of warrant or right, exercise price of warrants or rights		$ 0.01
Incremental common shares attributable to conversion of debt securities, total		2,183,708	2,183,708
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount		340,459	196,338
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount		705,078	694,691
Two Customers
Basis Of Presentation And Accounting Policies [Line Items]
Contract with customer, liability		$ 200
Deferred Reimbursement And Deferred Reservation Fees
Basis Of Presentation And Accounting Policies [Line Items]
Contract with customer, liability		1,400
Geographic Distribution, Foreign
Basis Of Presentation And Accounting Policies [Line Items]
Contract with customer, liability		$ 1,600
Accounting Standards Update 2016-02 [Member]
Basis Of Presentation And Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset	$ 33,700
Operating Lease, Liability	31,900
Accounting Standards Update 2016-02 [Member] \| Change in Accounting Principle for Equipment, Office and Land Leases [Member]
Basis Of Presentation And Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	1,700
Accounting Standards Update 2016-02 [Member] \| Change in Accounting Principle for Unamortized Deferred Gains [Member]
Basis Of Presentation And Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	8,700
Impact of adoption of new accounting standard	11,000
Cumulative Effect on Retained Earnings, Tax	$ 2,300

Basis of Presentation and Accounting Policies - Schedule of Deferred Revenues (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Basis Of Presentation And Accounting Policies [Abstract]
Balance at beginning of period	$ 1,327	$ 10,104
Revenues deferred during the period	4,211	1,673
Revenues recognized during the period	(2,367)	(1,550)
Balance at end of period	$ 3,171	$ 10,227

Basis of Presentation and Accounting Policies - Schedule of Property and Equipment Useful Life (Details)	6 Months Ended
	Jun. 30, 2019
Crew Transfer Vessels
Property Plant And Equipment [Line Items]
Estimated useful life (Year)	10 years
All Other Offshore Support Vessels
Property Plant And Equipment [Line Items]
Estimated useful life (Year)	20 years

Basis of Presentation and Accounting Policies - Schedule of Deferred Gain Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Basis Of Presentation And Accounting Policies [Abstract]
Balance at beginning of period	$ 11,819	$ 25,006
Amortization of deferred gains included in operating expenses as a reduction to rental expense		(4,019)
Impact of adoption of new accounting standard	(11,026)
Other adjustments		(250)
Balance at end of period	$ 793	$ 20,737

Basis of Presentation and Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 542,123	$ 503,172	$ 554,935	$ 523,166
Other comprehensive loss	(2,517)	(2,807)	(2,541)	(634)
Balance	511,240	580,815	511,240	580,815
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(15,472)
Other comprehensive loss			(276)
Balance	(15,748)		(15,748)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(1,316)
Other comprehensive loss			(2,092)
Balance	(3,408)		(3,408)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(16,812)	(10,424)	(16,788)	(12,493)
Other comprehensive loss			(2,368)
Balance	(19,156)	$ (13,129)	(19,156)	$ (13,129)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(1,445)
Balance	(1,445)		(1,445)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			(11)
Balance	(11)		(11)
AOCI Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			0
Other comprehensive loss			(2,368)
Balance	$ (2,368)		$ (2,368)

Equipment Acquisitions and Dispositions - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Vessel
Property Plant And Equipment [Line Items]
Payments to acquire property, plant, and equipment, including fair value hedges \| $	$ 41.2
Proceeds from sale of property, plant, and equipment, excluding deposits for future vessel sales \| $	9.8
Proceeds from deposits \| $	4.3
Gain (loss) on disposition of property, plant and equipment \| $	$ 2.4
Fast Support Vessels
Property Plant And Equipment [Line Items]
Number of equipment acquired	2
Number of equipment sold	2
Crew Transfer Vessels
Property Plant And Equipment [Line Items]
Number of equipment acquired	1
Platform Supply Vessel
Property Plant And Equipment [Line Items]
Number of equipment acquired	1
Vessel Under Construction
Property Plant And Equipment [Line Items]
Number of equipment sold	1
Specialty Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold	1
Emegency Responce And Rescue Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold	1
Anchor Handling Towing Supply
Property Plant And Equipment [Line Items]
Number of equipment sold	3
Supply Vessels
Property Plant And Equipment [Line Items]
Number of equipment sold	2

Investments, at Equity, and Advances to 50% or Less Owned Companies - Additional Information (Details)			6 Months Ended		12 Months Ended
	May 31, 2019 Vessel	Dec. 19, 2018 USD ($) Vessel	Jun. 30, 2019 USD ($) Vessel	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) Vessel
Schedule Of Investments [Line Items]
Payments to acquire interest in unconsolidated joint venture \| $			$ 2,669,000	$ 25,560,000
FRS Windcat Offshore Logistics GmbH
Schedule Of Investments [Line Items]
Number of equipment sold \| Vessel			1
Sale of vessel, consideration \| $			$ 4,300,000
SeaCosco Offshore LLC
Schedule Of Investments [Line Items]
Contributed capital \| $			$ 2,000,000		$ 29,600,000
SeaCosco Offshore LLC \| MOU
Schedule Of Investments [Line Items]
Agreement standstill date	Aug. 31, 2019
Loans receivable, interest rate	15.00%
SeaCosco Offshore LLC \| SEACOR Offshore Asia
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage			50.00%
SeaCosco Offshore LLC \| CSFT and CSIHK
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage			50.00%
SeaCosco Offshore LLC \| CSFT and CSIHK \| MOU
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage	50.00%
SeaCosco Offshore LLC \| Platform Supply Vessels
Schedule Of Investments [Line Items]
Number of vessels delivered to the company \| Vessel			3		2
Number of vessels for which the company gets title \| Vessel			1		5
Number of vessels acquired \| Vessel			2
SeaCosco Offshore LLC \| Platform Supply Vessels \| MOU
Schedule Of Investments [Line Items]
Number of vessels acquired \| Vessel	2
Mexmar Offshore International
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage		49.00%
Payments to acquire interest in unconsolidated joint venture \| $		$ 4,900,000
Number of vessels owned \| Vessel		14
Equity investments unrealized gain loss \| $			$ 0
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage			50.00%
Allocable share of uncalled capital \| $			$ 800,000

Long Term Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 434,670	$ 442,972
Portion due within one year	(20,651)	(16,812)
Debt discount	(29,243)	(32,005)
Issue costs	(5,701)	(6,301)
Long-term debt	379,075	387,854
SEACOR Marine Foreign Holdings Syndicated Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	120,250	126,750
Convertible Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	125,000	125,000
Falcon Global USA Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	109,099	109,099
Sea-Cat Crewzer III Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	25,366	25,989
Windcat Workboats Facilities
Debt Instrument [Line Items]
Long-term Debt, Gross	24,647	24,850
Falcon Global USA Revolver
Debt Instrument [Line Items]
Long-term Debt, Gross	15,000	15,000
SEACOR 88/888 Term Loan
Debt Instrument [Line Items]
Long-term Debt, Gross	11,000	11,000
BNDES Equipment Construction Finance Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 4,308	$ 5,284

Long Term Debt - Additional Information (Details) - USD ($)	Jun. 30, 2019	Sep. 26, 2018
Long-term Debt Obligation
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 4,300,000
Lease Obligation
Debt Instrument [Line Items]
Letters of credit outstanding, amount	300,000
Labor And Performance Guarantees
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 2,600,000
Loan Facility With DNB Bank ASA
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 130,000,000

Leases - Additional Information (Details)	6 Months Ended
Leases - Additional Information (Details)	Jun. 30, 2019 Vessel
Anchor Handling Towing Supply Vessels
Lessee Lease Description [Line Items]
Number of operating leases on equipment	4
Liftboats
Lessee Lease Description [Line Items]
Number of operating leases on equipment	2
Fast Support Vessels
Lessee Lease Description [Line Items]
Number of operating leases on equipment	1
Supply Vessels, Certain Facilities And Other Equipments
Lessee Lease Description [Line Items]
Number of operating leases on equipment	1
Vessels \| Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	5 months
Vessels \| Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	29 months
Other Equipment \| Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	7 months
Other Equipment \| Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	330 months

Leases - Summary of Future Minimum Payments For Operating Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 9,800
2020	14,049
2021	7,101
2022	651
2023	622
Years subsequent to 2023	4,851
Operating lease payments due	37,074
Interest component	(3,747)
Total operating leases	33,327
Current portion of long-term operating lease liabilities	16,552
Long-term operating lease liabilities	$ 16,775

Leases - Summary of Components of Leases Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 3,611	$ 7,224
Short-term lease expense (lease duration of twelve months or less at lease commencement)	706	1,241
Total Lease expense	$ 4,317	$ 8,465

Leases - Summary of Other Information Related to Operating Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 9,782
Right-of-use assets obtained for operating lease liabilities	$ 33,928
Weighted average remaining lease term, in years	4 years 8 months 12 days
Weighted average discount rate	4.10%

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21.00%
Foreign taxes not creditable against U.S. income tax	(4.50%)
Foreign earnings not subject to U.S. income tax	(3.70%)
Noncontrolling interests	(2.20%)
State taxes	1.80%
Other	0.10%
Effective income tax rate reconciliation, percent, total	12.50%	20.10%

Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Designated as Hedging Instrument \| Cash Flow Hedging
Derivative [Line Items]
Derivative Liability	$ 3,394	$ 1,659
Designated as Hedging Instrument \| Interest Rate Swap \| Cash Flow Hedging
Derivative [Line Items]
Derivative Liability	3,394	1,659
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability	10,993	6,935
Conversion option liability on Convertible Senior Notes	$ 7,599	$ 5,276

Derivative Instruments and Hedging Strategies - Additional Information (Details) - Interest Rate Swap € in Millions, $ in Millions	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)
OSV Partners
Derivative [Line Items]
Derivative, number of instruments held, total	2	2
Derivative, notional amount	$ 25.4
OSV Partners \| Minimum
Derivative [Line Items]
Derivative, fixed interest rate	1.89%	1.89%
OSV Partners \| Maximum
Derivative [Line Items]
Derivative, fixed interest rate	2.27%	2.27%
Cash Flow Hedging \| Designated as Hedging Instrument \| Windcat Workboats Holdings Ltd
Derivative [Line Items]
Derivative, number of instruments held, total	2	2
Derivative, fixed interest rate	0.03%	0.03%
Derivative, notional amount	$ 17.0	€ 15.0
Cash Flow Hedging \| Designated as Hedging Instrument \| SEACOR Marine Foreign Holdings
Derivative [Line Items]
Derivative, fixed interest rate	3.32%	3.32%
Derivative, notional amount	$ 9.3
Cash Flow Hedging \| Designated as Hedging Instrument \| SMFH
Derivative [Line Items]
Derivative, fixed interest rate	3.195%	3.195%
Derivative, notional amount	$ 51.3
Cash Flow Hedging \| Designated as Hedging Instrument \| SEACOR 88/888
Derivative [Line Items]
Derivative, fixed interest rate	3.20%	3.20%
Derivative, notional amount	$ 5.5
Cash Flow Hedging \| Designated as Hedging Instrument \| MexMar
Derivative [Line Items]
Derivative, number of instruments held, total	5	5
Derivative, notional amount	$ 91.0
Cash Flow Hedging \| Designated as Hedging Instrument \| MexMar \| Minimum
Derivative [Line Items]
Derivative, fixed interest rate	1.71%	1.71%
Cash Flow Hedging \| Designated as Hedging Instrument \| MexMar \| Maximum
Derivative [Line Items]
Derivative, fixed interest rate	2.10%	2.10%

Derivative Instruments and Hedging Strategies - Schedule of (Losses) Gains on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (2,323)	$ (14,184)
Embedded Derivative Financial Instruments
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (2,323)	(15,054)
Interest Rate Swap
Derivative [Line Items]
Gains (losses) on derivative instruments		$ 870

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Construction reserve funds	$ 20,112	$ 28,221
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Liability	3,394	1,659
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Conversion Option Liability on Convertible Senior Notes	$ 7,599	$ 5,276

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	$ 61,012	$ 96,852
Investments, at cost, in 50% or less owned companies (included in other assets)	132	132
Long-term debt, including current portion	399,726	404,666
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	61,012	96,852
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 384,310	$ 388,949

Fair Value Measurements - Schedule of Other Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Inputs, Level 2 $ in Thousands	Jun. 30, 2019 USD ($)
Anchor Handling Towing Supply
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Property and equipment	$ 1,210
Fast Support Vessels
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Property and equipment	$ 2,490

Fair Value Measurements - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Fair Value Disclosures [Abstract]
impairment charges	$ 5.9

Warrants - Additional Information (Details) - USD ($)							3 Months Ended	6 Months Ended
Warrants - Additional Information (Details) - USD ($)	Jun. 14, 2019	May 28, 2019	Jun. 08, 2018	May 31, 2018	May 02, 2018	Apr. 26, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Class Of Warrant Or Right [Line Items]
Stock issued during period, value, new issues							$ 41,202,000	$ 6,596,000	$ 42,995,000
Class of warrant or right, exercise price of warrants or rights								$ 0.01
Carlyle Group \| Convertible Senior Notes Converted to Warrants
Class Of Warrant Or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights					$ 0.01
Debt conversion, original debt, amount					$ 50,000,000
Warrants Issued in Private Placement
Class Of Warrant Or Right [Line Items]
Class of warrant or right, outstanding						2,168,586
Class of warrant or right, number of securities called by warrants or rights						674,164
Class of warrant or right, exercise price of warrants or rights						$ 0.01
PIPE Warrants
Class Of Warrant Or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights						$ 0.01
Warrants and rights outstanding, term						25 years
Exchange Warrants
Class Of Warrant Or Right [Line Items]
Class of warrant or right, outstanding								1,826,966
Class of warrant or right, exercise price of warrants or rights					$ 0.01
Warrants and rights outstanding, term					25 years
Class of warrant or right, exercised during period	64,440	380,000	38,857	250,693
Class of warrant or right, exercised during period, exercise price			$ 0.01	$ 0.01
Common stock withheld	49
Exchange Warrants \| Carlyle Group
Class Of Warrant Or Right [Line Items]
Class of warrant or right, number of securities called by warrants or rights					1,886,292
Private Placement
Class Of Warrant Or Right [Line Items]
Stock issued during period, value, new issues						$ 56,855,000

Stockholders' Equity - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions	Mar. 15, 2019 USD ($) shares	Mar. 15, 2019 EUR (€) shares	Jan. 25, 2019 USD ($)	Jan. 25, 2019 GBP (£)	Jan. 09, 2019 USD ($) Vessel shares	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Cumulative Effect of New Accounting Principle in Period of Adoption								$ 10,416	$ (12,069)
Common stock value						$ 218		204
Windcat Workboats Facilities \| Seabulk Overseas
Business acquisition, percentage of voting interests acquired	6.25%	6.25%	6.25%	6.25%
Business combination, consideration transferred, total	$ 1,400	€ 1.2	$ 2,000	£ 1.5
Business acquisition, exchange for consideration \| shares	50,000	50,000
Ownership percentage			100.00%	100.00%
Private Placement
Stock Issued During Period, Shares, New Issues \| shares					603,872
Number of equipment acquired \| Vessel					3
Common stock value					$ 7,800
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption								$ 10,416	$ (12,069)
Retained Earnings [Member] \| Accounting Standards Update 2016-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption							$ 10,400

Noncontrolling Interests in Subsidiaries - Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries (Details) - USD ($)
$ in Thousands

Jun. 30, 2019

Dec. 31, 2018

Minority Interest [Line Items]

Noncontrolling interest

$ 22,691

$ 29,404

Falcon Global

Minority Interest [Line Items]

Noncontrolling interest, percent

28.00%

Noncontrolling interest

$ 22,386

$ 26,989

Windcat Workboats Facilities

Minority Interest [Line Items]

Noncontrolling interest, percent

0.00%

^[1]

12.50%

Noncontrolling interest

$ 2,115

Other Noncontrolling Interests

Minority Interest [Line Items]

Noncontrolling interest, percent

1.80%

Noncontrolling interest

$ 305

$ 300

[1]	As of June 30, 2019; at December 31, 2018, noncontrolling interest was 12.5%.

Noncontrolling Interests in Subsidiaries - Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries (Details) (Parenthetical)

Jun. 30, 2019

Dec. 31, 2018

Windcat Workboats Facilities

Minority Interest [Line Items]

Noncontrolling interest, percent

0.00%

^[1]

12.50%

[1]	As of June 30, 2019; at December 31, 2018, noncontrolling interest was 12.5%.

Noncontrolling Interests in Subsidiaries - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 15, 2019	Jan. 25, 2019
Minority Interest [Line Items]
Net income (loss), including portion attributable to noncontrolling interest, total	$ (30,264)	$ (26,629)	$ (58,537)	$ (58,317)
Net income (loss) attributable to noncontrolling interest, total	$ (1,875)	$ (1,605)	(4,599)	(4,460)
Windcat Workboats Facilities
Minority Interest [Line Items]
Net income (loss), including portion attributable to noncontrolling interest, total			3,300
Net income (loss) attributable to noncontrolling interest, total			400
Falcon Global Holdings
Minority Interest [Line Items]
Net income (loss), including portion attributable to noncontrolling interest, total			16,600	14,400
Net income (loss) attributable to noncontrolling interest, total			$ 4,600	$ 4,000
Noncontrolling interest, ownership percentage by parent	72.00%		72.00%
Windcat Workboats
Minority Interest [Line Items]
Noncontrolling interest, ownership percentage by parent						87.00%
Windcat Workboats \| Seabulk Overseas
Minority Interest [Line Items]
Business acquisition, percentage of voting interests acquired					6.25%	6.25%

- Definition

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

+ References

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

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

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

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

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

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

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

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

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

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

+ Details

Commitments and Contingencies - Additional Information (Details) € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)
Commitments And Contingencies [Line Items]
Remaining capital commitment	$ 58.9
Unrecorded unconditional purchase obligation, due in remainder of fiscal year	23.6
Unrecorded unconditional purchase obligation, due within two years	35.3
Unrecorded unconditional purchase obligation, due within three years	20.6
Amount guaranteed under arrangement	$ 32.1
SEACOR Holdings
Commitments And Contingencies [Line Items]
Related party transaction, rate	0.50%
Line of Credit \| Performance Guarantee
Commitments And Contingencies [Line Items]
Amount guaranteed under arrangement \| €		€ 0.9
Fast Support Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity	1	1
Crew Transfer Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity	2	2
Platform Supply Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity	5	5

Stock Based Compensation - Summary of Transactions in Connection with 2017 Equity Incentive Plan (Details)	6 Months Ended
	Jun. 30, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of December 31, 2018 (in shares)	805,566
Granted (in shares)	149,253
Exercise of options (in shares)	8,750
Forfeited (in shares)	5,000
Outstanding as of March 31, 2019 (in shares)	941,069
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of December 31, 2018 (in shares)	192,346
Granted (in shares)	321,100
Vested (in shares)	62,387
Forfeited (in shares)	1,000
Outstanding as of March 31, 2019 (in shares)	450,059

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Treasury stock, shares acquired			21,587
Treasury stock, value acquired cost method	$ 2	$ 51	$ 284	$ 51

Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Dec. 31, 2018

Segment Reporting Information [Line Items]

Operating Revenues

$ 64,345

$ 60,701

$ 120,594

$ 112,422

Direct Costs and Expenses

43,525

45,980

87,802

84,328

Direct Vessel Profit

20,820

14,721

32,792

28,094

Lease expense

4,317

3,331

8,465

6,589

Administrative and general

11,639

15,041

23,639

27,415

Depreciation and amortization

17,494

18,406

34,687

37,918

Other Costs and Expenses

33,450

36,778

66,791

71,922

Gains (Losses) on Asset Dispositions and Impairments, Net

(3,848)

1,055

(3,489)

(1,588)

Operating Loss

(16,478)

(21,002)

(37,488)

(45,416)

Historical cost

1,222,820

1,287,855

1,222,820

1,287,855

$ 1,242,733

Accumulated depreciation

(525,556)

(564,477)

(525,556)

(564,477)

(561,272)

Property and equipment

697,264

723,378

697,264

723,378

$ 681,461

Total Assets

993,425

^[1]

978,111

^[2]

993,425

^[1]

978,111

^[2]

Average Rates Per Day

$ 7,324

Fleet Utilization

62.00%

Fleet Available Days

12,528

Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

58,773

$ 56,826

110,900

103,968

Bareboat Charter

Segment Reporting Information [Line Items]

Operating Revenues

1,389

1,156

2,532

2,299

Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

4,183

2,719

7,162

6,155

Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

23,961

24,733

46,717

46,409

Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

8,676

9,070

17,682

16,143

Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

2,074

3,112

4,953

5,369

Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

1,892

1,934

3,366

3,124

Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

3,892

4,122

7,645

7,667

Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

3,030

3,009

7,439

5,616

UNITED STATES

Segment Reporting Information [Line Items]

Operating Revenues

14,181

10,728

23,318

18,365

Direct Costs and Expenses

11,580

8,906

22,220

15,069

Direct Vessel Profit

2,601

1,822

1,098

3,296

Lease expense

2,942

2,065

5,853

4,109

Depreciation and amortization

5,341

5,915

10,839

12,450

Historical cost

364,501

439,026

364,501

439,026

Accumulated depreciation

(189,602)

(225,116)

(189,602)

(225,116)

Property and equipment

174,899

213,910

174,899

213,910

Total Assets

312,465

^[1]

351,718

^[2]

312,465

^[1]

351,718

^[2]

Average Rates Per Day

$ 10,503

Fleet Utilization

23.00%

Fleet Available Days

3,710

UNITED STATES | Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

12,628

$ 9,052

20,633

15,034

UNITED STATES | Bareboat Charter

Segment Reporting Information [Line Items]

Operating Revenues

233

UNITED STATES | Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

1,320

1,676

2,452

3,331

UNITED STATES | Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

5,203

4,636

9,706

8,628

UNITED STATES | Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

2,515

1,529

5,293

2,223

UNITED STATES | Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

1,801

910

3,795

1,435

UNITED STATES | Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

841

902

1,433

1,336

UNITED STATES | Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

1,107

900

1,790

1,393

UNITED STATES | Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

113

203

Africa

Segment Reporting Information [Line Items]

Operating Revenues

11,153

11,472

21,289

23,553

Direct Costs and Expenses

6,283

9,437

14,745

16,791

Direct Vessel Profit

4,870

2,035

6,544

6,762

Lease expense

787

1,092

1,572

2,161

Depreciation and amortization

2,759

2,924

5,115

5,731

Historical cost

220,855

184,037

220,855

184,037

Accumulated depreciation

(62,061)

(57,909)

(62,061)

(57,909)

Property and equipment

158,794

126,128

158,794

126,128

Total Assets

171,084

^[1]

130,930

^[2]

171,084

^[1]

130,930

^[2]

Average Rates Per Day

$ 9,509

Fleet Utilization

88.00%

Fleet Available Days

1,331

Africa | Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

10,400

$ 11,122

21,173

21,916

Africa | Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

753

350

116

1,637

Africa | Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

3,428

4,314

7,295

8,387

Africa | Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

952

1,663

2,136

3,019

Africa | Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

(48)

910

290

912

Africa | Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

239

248

452

466

Africa | Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

939

900

1,693

1,569

Africa | Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

773

1,402

2,879

2,438

Middle East and Asia [Member]

Segment Reporting Information [Line Items]

Operating Revenues

13,524

12,799

26,251

24,043

Direct Costs and Expenses

9,095

9,836

17,837

18,753

Direct Vessel Profit

4,429

2,963

8,414

5,290

Lease expense

118

Depreciation and amortization

4,274

4,311

8,523

10,401

Historical cost

288,677

317,536

288,677

317,536

Accumulated depreciation

(74,815)

(86,239)

(74,815)

(86,239)

Property and equipment

213,862

231,297

213,862

231,297

Total Assets

252,926

^[1]

265,451

^[2]

252,926

^[1]

265,451

^[2]

Average Rates Per Day

$ 8,226

Fleet Utilization

82.00%

Fleet Available Days

2,005

Middle East and Asia [Member] | Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

13,175

$ 13,591

25,674

24,965

Middle East and Asia [Member] | Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

349

(792)

577

(922)

Middle East and Asia [Member] | Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

4,292

4,069

8,546

8,091

Middle East and Asia [Member] | Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

2,629

3,576

4,822

6,004

Middle East and Asia [Member] | Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

275

434

Middle East and Asia [Member] | Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

381

361

708

597

Middle East and Asia [Member] | Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

725

922

1,434

1,956

Middle East and Asia [Member] | Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

793

836

1,893

2,044

Latin America

Segment Reporting Information [Line Items]

Operating Revenues

3,475

6,557

10,175

9,184

Direct Costs and Expenses

2,365

2,268

5,419

3,141

Direct Vessel Profit

1,110

4,289

4,756

6,043

Lease expense

Depreciation and amortization

1,659

2,280

3,595

3,499

Historical cost

108,068

165,145

108,068

165,145

Accumulated depreciation

(49,393)

(58,078)

(49,393)

(58,078)

Property and equipment

58,675

107,067

58,675

107,067

Total Assets

123,513

^[1]

176,473

^[2]

123,513

^[1]

176,473

^[2]

Average Rates Per Day

$ 19,127

Fleet Utilization

57.00%

Fleet Available Days

416

Latin America | Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

2,046

$ 4,556

6,968

5,930

Latin America | Bareboat Charter

Segment Reporting Information [Line Items]

Operating Revenues

1,156

2,299

Latin America | Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

273

845

908

955

Latin America | Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

976

1,219

2,532

1,595

Latin America | Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

481

816

337

Latin America | Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

(32)

Latin America | Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

169

201

236

Latin America | Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

314

349

742

414

Latin America | Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

560

488

1,081

548

Europe

Segment Reporting Information [Line Items]

Operating Revenues

22,012

19,145

39,561

37,277

Direct Costs and Expenses

14,202

15,533

27,581

30,574

Direct Vessel Profit

7,810

3,612

11,980

6,703

Lease expense

546

113

951

198

Depreciation and amortization

3,461

2,976

6,615

5,837

Historical cost

240,719

182,111

240,719

182,111

Accumulated depreciation

(149,685)

(137,135)

(149,685)

(137,135)

Property and equipment

91,034

44,976

91,034

44,976

Total Assets

133,437

^[1]

53,539

^[2]

133,437

^[1]

53,539

^[2]

Average Rates Per Day

$ 4,823

Fleet Utilization

76.00%

Fleet Available Days

5,066

Europe | Time Charter

Segment Reporting Information [Line Items]

Operating Revenues

20,524

$ 18,505

36,452

36,123

Europe | Other Marine Services

Segment Reporting Information [Line Items]

Operating Revenues

1,488

640

3,109

1,154

Europe | Personnel

Segment Reporting Information [Line Items]

Direct Costs and Expenses

10,062

10,495

18,638

19,708

Europe | Repairs and Maintenance

Segment Reporting Information [Line Items]

Direct Costs and Expenses

2,099

2,270

4,615

4,560

Europe | Drydocking

Segment Reporting Information [Line Items]

Direct Costs and Expenses

1,209

387

2,950

Europe | Insurance and Loss Reserves

Segment Reporting Information [Line Items]

Direct Costs and Expenses

365

254

572

489

Europe | Fuel, Lubes and Supplies

Segment Reporting Information [Line Items]

Direct Costs and Expenses

807

1,051

1,986

2,335

Europe | Other Direct Costs and Expenses

Segment Reporting Information [Line Items]

Direct Costs and Expenses

$ 791

$ 254

$ 1,383

$ 532

[1]	Total assets by region does not include corporate assets of $83,271 as of June 30, 2019.
[2]	Total assets by region does not include corporate assets of $154,427 as of June 30, 2018.

Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Assets, Total	$ 1,076,696,000	$ 1,102,935,000
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets, Total	$ 83,271		$ 154,427

Segment Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Information [Line Items]
Equity method investments	$ 112,400		$ 112,400
Equity in (Losses) Earnings of 50% or Less Owned Companies	$ (7,006)	$ (721)	$ (10,403)	$ (513)
Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Other Offshore Marine Services Joint Ventures
Segment Information [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Equity method investments	$ 115,400		$ 115,400
Other Offshore Marine Services Joint Ventures \| Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%

- 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