SEACOR Marine (SMHI) 10-Q 3 May 23 2023 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
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	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		27,096,812
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-37966
Entity Tax Identification Number	47-2564547
Entity Address, Address Line One	12121 Wickchester Lane
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
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 40,570	$ 39,963
Restricted cash	3,082	3,082
Receivables:
Trade, net of allowance for credit loss accounts of $1,546 and $1,650 as of March 31, 2023 and December 31, 2022, respectively	60,114	54,388
Other	11,913	7,638
Note receivable	10,000	15,000
Tax receivable	445	578
Inventories	2,207	2,123
Prepaid expenses and other	3,233	3,054
Assets held for sale	0	6,750
Total current assets	131,564	132,576
Property and Equipment:
Historical cost	969,328	967,683
Accumulated depreciation	(324,197)	(310,778)
Property and equipment	645,131	656,905
Construction in progress	8,540	8,111
Net property and equipment	653,671	665,016
Right-of-use asset - operating leases	5,984	6,206
Right-of-use asset - finance leases	6,654	6,813
Investments, at equity, and advances to 50% or less owned companies	3,594	3,024
Other assets	2,079	1,995
Total assets	803,546	815,630
Current Liabilities:
Current portion of operating lease liabilities	1,764	2,358
Current portion of finance lease liabilities	563	468
Current portion of long-term debt:
Recourse	60,523	61,512
Accounts payable and accrued expenses	44,255	37,954
Due to SEACOR Holdings	264	264
Accrued wages and benefits	5,025	4,361
Accrued interest	4,675	2,305
Deferred revenue and unearned revenue	1,487	2,333
Accrued capital, repair, and maintenance expenditures	1,327	2,748
Accrued insurance deductibles and premiums	2,837	2,428
Accrued professional fees	873	1,114
Other current liabilities	3,961	3,580
Total current liabilities	127,554	121,425
Long-term operating lease liabilities	4,474	4,739
Long-term finance lease liabilities	6,644	6,781
Long-term Debt:
Recourse	248,974	254,653
Non-recourse	5,476	5,466
Deferred income taxes	39,120	40,779
Deferred gains and other liabilities	2,264	2,641
Total liabilities	434,506	436,484
SEACOR Marine Holdings Inc. stockholders’ equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 27,574,544 and 26,950,799 shares issued as of March 31, 2023 and December 31, 2022, respectively	279	272
Additional paid-in capital	467,896	466,669
Accumulated deficit	(102,700)	(93,111)
Shares held in treasury of 468,966 and 248,638 as of March 31, 2023 and December 31, 2022, respectively, at cost	(4,119)	(1,852)
Accumulated other comprehensive income, net of tax	7,363	6,847
Total stockholders equity	368,719	378,825
Noncontrolling interests in subsidiaries	321	321
Total equity	369,040	379,146
Total liabilities and equity	$ 803,546	$ 815,630

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Trade receivables, allowance for credit loss	$ 1,546	$ 1,650
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)	27,574,544	26,950,799
Shares held in treasury (in shares)	468,966	248,638

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Operating Revenues	$ 59,973	$ 45,591
Costs and Expenses:
Operating	37,273	39,496
Administrative and general	11,632	9,924
Lease expense	720	1,060
Depreciation and amortization	13,762	14,371
Costs and expenses	63,387	64,851
Gains on asset dispositions and impairments, net	3,599	2,139
Operating Income (Loss)	185	(17,121)
Other Income (Expense):
Interest income	460	29
Interest expense	(8,788)	(6,627)
Derivative losses, net	0	(34)
Foreign currency (losses) gains, net	(825)	821
Nonoperating income expense	(9,153)	(5,811)
Loss Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies	(8,968)	(22,932)
Income Tax Expense (Benefit)	1,157	(2,421)
Loss Before Equity in Earnings of 50% or Less Owned Companies	(10,125)	(20,511)
Equity in Earnings of 50% or Less Owned Companies	536	5,674
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (9,589)	$ (14,837)
Net Earnings (Loss) Per Share:
Basic	$ (0.36)	$ (0.56)
Diluted	$ (0.36)	$ (0.56)
Weighted Average Common Stock and Warrants Outstanding:
Basic	26,822,391	26,379,293
Diluted	26,822,391	26,379,293

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Loss	$ (9,589)	$ (14,837)
Other Comprehensive Income:
Foreign currency translation gains (losses), net	668	(714)
Derivative gains on cash flow hedges	14	805
Other comprehensive income	516	798
Income Tax Benefit	0	0
Other comprehensive income, net	516	798
Comprehensive Loss Attributable to SEACOR Marine Holdings Inc.	(9,073)	(14,039)
Interest Expense
Other Comprehensive Income:
Reclassification of derivative gains on cash flow hedges	$ (166)	370
Equity Method Investments
Other Comprehensive Income:
Reclassification of derivative gains on cash flow hedges		$ 337

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]
Reclassification of derivative losses on cash flow hedges to equity in earnings	50%	50%

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2021	$ 446,541	$ 262	$ 461,931	$ (1,120)	$ (22,907)	$ 8,055	$ 320
Balance (in shares) at Dec. 31, 2021		25,992,237		127,887
Restricted stock grants	7	$ 7
Restricted stock grants (in shares)		733,895
Amortization of share awards	1,067		1,067
Exercise of options	140		140
Exercise of options (in shares)		31,992
Restricted stock vesting	(672)			$ (672)
Restricted stock vesting (in shares)		(114,251)		114,251
Net Loss	(14,837)				(14,837)
Other comprehensive income	798					798
Balance at Mar. 31, 2022	433,044	$ 269	463,138	$ (1,792)	(37,744)	8,853	320
Balance (in shares) at Mar. 31, 2022		26,643,873		242,138
Balance at Dec. 31, 2022	$ 379,146	$ 272	466,669	$ (1,852)	(93,111)	6,847	321
Balance (in shares) at Dec. 31, 2022	26,950,799	26,702,161		248,638
Restricted stock grants	$ 6	$ 6
Restricted stock grants (in shares)		520,396
Amortization of share awards	1,221		1,221
Exercise of options	$ 6		6
Exercise of options (in shares)	834	834
Exercise of warrants		$ 1		$ (1)
Exercise of Warrants (in shares)		117,394		121
Restricted stock vesting	$ (2,266)			$ (2,266)
Restricted stock vesting (in shares)	(220,207)	(220,207)		220,207
Forfeiture of employee share awards (in shares)		(15,000)
Net Loss	$ (9,589)				(9,589)
Other comprehensive income	516					516
Balance at Mar. 31, 2023	$ 369,040	$ 279	$ 467,896	$ (4,119)	$ (102,700)	$ 7,363	$ 321
Balance (in shares) at Mar. 31, 2023	27,574,544	27,105,578		468,966

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows from Operating Activities:
Net Loss	$ (9,589)	$ (14,837)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	13,762	14,371
Deferred financing costs amortization	418	291
Stock-based compensation expense	1,227	1,074
Debt discount amortization	1,558	1,691
Allowance for credit losses	(104)	(170)
Gain from equipment sales, retirements or impairments	(3,599)	(2,139)
Derivative losses	0	34
Interest on finance leases	72	25
Settlement on derivative transactions, net	154	(373)
Currency losses (gains)	825	(821)
Deferred income taxes	(1,659)	(3,529)
Equity earnings	(536)	(5,674)
Dividends received from equity investees	0	725
Changes in Operating Assets and Liabilities:
Accounts receivables	(9,857)	3,904
Other assets	45	(164)
Accounts payable and accrued liabilities	6,731	6,707
Net cash (used in) provided by operating activities	(552)	1,115
Cash Flows from Investing Activities:
Purchases of property and equipment	(470)	(20)
Proceeds from disposition of property and equipment	7,611	5,310
Principal payments on notes due from equity investees	0	176
Principal payments on notes due from others	5,000	0
Net cash provided by investing activities	12,141	5,466
Cash Flows from Financing Activities:
Payments on long-term debt	(8,608)	(7,348)
Payments on finance leases	(114)	(9)
Proceeds from exercise of stock options	6	140
Tax withholdings on restricted stock vesting	(2,266)	(672)
Net cash used in financing activities	(10,982)	(7,889)
Effects of Exchange Rate Changes on Cash and Cash Equivalents	0	(1)
Net Change in Cash, Restricted Cash and Cash Equivalents	607	(1,309)
Cash, Restricted Cash and Cash Equivalents, Beginning of Period	43,045	41,220
Cash, Restricted Cash and Cash Equivalents, End of Period	43,652	39,911
Supplemental disclosures:
Cash paid for interest, excluding capitalized interest	(5,955)	(3,099)
Income taxes paid, net	446	0
Noncash Investing and Financing Activities:
Increase in capital expenditures in accounts payable and accrued liabilities	51	0
Recognition of a new right-of-use asset - operating leases	196	163
Recognition of a new right-of-use asset - financing leases	$ 0	$ 7,248

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	3 Months Ended
	Mar. 31, 2023
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 (“GAAP”) 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, 2022 (the “2022 Annual Report”). 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 October 29, 2020, the FASB issued ASU 2020-10, Codification Improvements: Amendments that improve the consistency of the Codification by including all disclosure guidance in the appropriate disclosure section. The guidance was effective for annual periods beginning after December 15, 2020, and interim periods within the annual periods beginning after December 15, 2022. The adoption of the standard did not have a material effect on the disclosures included herein. On August 5, 2020, the FASB issued ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. The Company adopted the new standard on January 1, 2022 . The adoption of the standard by the Company did no t have a material impact on its consolidated financial position or on its results of operations, cash flows and disclosures. Critical Accounting Policies. Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation. Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include those related to deferred revenues, allowance for credit loss accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from estimates and those differences may be material. 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. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of Mexico, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contract or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. 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 vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 740 4,288 Revenues recognized and reclassifications during the period ( 1,586 ) ( 3,561 ) Balance at end of period $ 1,487 $ 2,333 As of March 31, 2023 , the Company had $ 1.5 million of unearned revenue primarily related to mobilization of vessels and had no deferred revenues. Cash and Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents. Restricted Cash. Restricted cash primarily relates to banking facility requirements. Trade and Other Receivables. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables, but excludes our short-term note receivable. During the three months ended March 31, 2023 , the Company recorded $ 2.2 million of insurance receivables that offset operating expenses. These insurance receivables related to costs that were recorded as operating expenses in 2022 and were previously disclosed as a gain contingency. The Company routinely reviews its receivables and makes provisions for the credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. Trade receivables are deemed uncollectible and are removed from accounts receivable and the allowance for credit losses when collection efforts have been exhausted. 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 vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date. As of March 31, 2023 , the estimated useful life of the Company’s new offshore support vessels was 20 years. 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. There was no capitalized interest recognized during the three months ended March 31, 2023 and 2022 . Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations 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 their estimated future 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. For the three months ended March 31, 2023 , the Company did no t record an impairment on any owned or leased-in vessels. For the three months ended March 31, 2022 , the Company recorded impairment charges of $ 0.9 million for one fast support vessel (“FSV”) classified as held for sale during the first quarter of 2022 and sold during the second quarter of 2022. Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of March 31, 2023, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third-party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the three months ended March 31, 2023 and 2022 , the Company did no t recognize any impairment charges related to its 50% or less owned companies. Income Taxes. During the three months ended March 31, 2023 , the Company’s effective income tax rate of 12.89 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes and foreign losses for which there is no benefit in the U.S. Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive (loss) income 668 ( 152 ) 516 Balance as of March 31, 2023 $ 7,000 $ 363 $ 7,363 Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of the Company is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic earnings/loss per share of Common Stock because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted earnings/loss per share of Common Stock is computed based on the weighted average number of shares of Common Stock 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 shares of Common Stock have been issued and outstanding during the relevant periods pursuant to the conversion of the Old Convertible Notes and the New Convertible Notes unless anti-dilutive. For the three months ended March 31, 2023 , diluted loss per share of Common Stock excluded 2,978,274 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. For the three months ended March 31, 2022 , diluted loss per share of Common Stock excluded 2,907,500 shares of Common Stock issuable upon conversion of the Old Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three months ended March 31, 2023 and 2022 diluted loss per share of Common Stock excluded 1,672,932 and 1,469,647 shares of restricted stock, respectively, and 1,026,031 and 1,029,365 shares of Common Stock, respectively, issuable upon exercise of outstanding stock options as the effect of their inclusion in the computation would be anti-dilutive.

Note Receivable

Note Receivable	3 Months Ended
	Mar. 31, 2023
Receivables [Abstract]
Note Receivable	2. NOTE RECEIVABLE In connection with the closing of the framework agreement transactions (the “Framework Agreement Transactions”), on September 29, 2022, SEACOR Marine Capital Inc., a wholly-owned subsidiary of SEACOR Marine (“SEACOR Marine Capital”) purchased all of the outstanding loans under the MexMar Original Facility Agreement for an aggregate amount of $ 28.8 million, representing par value of the loan using proceeds received from the Framework Agreement Transactions. On the same date, the MexMar Original Facility Agreement was amended and restated in the MexMar Third A&R Facility Agreement pursuant to which, among other things, Mantenimiento Express Marítimo, S.A.P.I. de C.V. (“MexMar”) repaid approximately $ 8.8 million of the outstanding loan amount and agreed to repay the $ 20.0 million of the loan that remained outstanding by September 30, 2023 through four quarterly installments of $ 5.0 million. As of March 31, 2023 , the loan balance due from MexMar was $ 10.0 million.

Equipment Acquisitions and Disp

Equipment Acquisitions and Dispositions	3 Months Ended
	Mar. 31, 2023
Property Plant And Equipment [Abstract]
Equipment Acquisitions and Dispositions	3. EQUIPMENT ACQUISITIONS AND DISPOSITIONS During the three months ended March 31, 2023, capital expenditures were $ 0.5 million and there were no equipment deliveries. During the three months ended March 31, 2023 , the Company sold three liftboats and other equipment, previously classified as held for sale, as well as other equipment not previously classified as such, for net cash proceeds of $ 7.6 million, after transaction costs, and a gain of $ 2.6 million. During the three months ended March 31, 2022 , the Company sold one liftboat, previously removed from service, and office space for net cash proceeds of $ 5.3 million, after transaction costs, and a gain of $ 3.1 million.

Investments, at Equity, and Adv

Investments, at Equity, and Advances to 50% or Less Owned Companies	3 Months Ended
	Mar. 31, 2023
Schedule Of Investments [Abstract]
Investments, at Equity, and Advances to 50% or Less Owned Companies	4. INVESTMENTS, AT EQUITY AND ADVANCES TO 50% OR LESS OWNED COMPANIES Investments, at equity, and advances to 50% or less owned companies as of March 31, 2023 and December 31, 2022 were as follows (in thousands): Ownership 2023 2022 Seabulk Angola 49.0 % 2,017 1,683 SEACOR Arabia 45.0 % 1,501 1,265 Other 20.0 % - 50.0 % 76 76 $ 3,594 $ 3,024

Long Term Debt

Long Term Debt	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Long Term Debt	5. LONG-TERM DEBT The Company’s long-term debt obligations as of March 31, 2023 and December 31, 2022 were as follows (in thousands): March 31, 2023 December 31, 2022 Recourse long-term debt (1) : Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 SEACOR Marine Foreign Holdings Credit Facility 64,507 67,910 Sea-Cat Crewzer III Term Loan Facility 15,465 16,703 SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt 16,205 16,205 SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing 75,314 77,537 SEACOR Alpine Shipyard Financing 27,087 27,790 SEACOR 88/888 Term Loan 5,500 5,500 Tarahumara Shipyard Financing 5,056 5,597 SEACOR Offshore OSV 15,552 16,052 Total recourse long-term debt 349,686 358,294 Non-recourse long-term debt (2) : SEACOR 88/888 Term Loan 5,500 5,500 Total non-recourse long-term debt 5,500 5,500 Total principal due for long-term debt 355,186 363,794 Current portion due within one year ( 60,523 ) ( 61,512 ) Unamortized debt discount ( 35,950 ) ( 37,511 ) Deferred financing costs ( 4,263 ) ( 4,652 ) Long-term debt, less current portion $ 254,450 $ 260,119 (1) Recourse debt represents debt issued by SEACOR Marine and/or its subsidiaries and guaranteed by SEACOR Marine or one of its operating subsidiaries as provided in the relevant debt agreements. (2) Non-recourse debt represents debt issued by one of the Company’s consolidated subsidiaries with no recourse to SEACOR Marine or its other non-debtor operating subsidiaries with respect to the applicable instrument, other than certain limited support obligations as provided in the respective debt agreements, which in aggregate are not considered to be material to the Company’s business and financial condition. As of March 31, 2023, the Company was in compliance with all debt covenants and lender requirements. SEACOR Marine Foreign Holdings Credit Facility. On March 2, 2023, the Company and SEACOR Marine Foreign Holdings Inc., a wholly-owned subsidiary of SEACOR Marine (“SMFH”) entered into Amendment No. 7 (“SMFH Amendment No. 7”) to that certain Second Amended and Restated Guaranty, dated as of September 29, 2022, issued by the Company in favor of DNB Bank ASA, New York Branch, as security trustee (the “Second A&R SMFH Credit Facility Guaranty”) in connection with that certain senior secured loan facility with a syndicate of lenders administered by DNB Bank ASA, New York Branch, dated as of September 26, 2018 and as amended from time to time (the “SMFH Credit Facility”). SMFH Amendment No. 7 extends the date through which the Company is required to maintain an interest coverage ratio of 1.50 :1.00 (as calculated in accordance with the Second A&R SMFH Credit Facility Guaranty) from December 31, 2022 to June 30, 2023. As of the last day of each fiscal quarter thereafter, the interest coverage ratio is required to be at least 2.00 :1.00. Letters of Credit . As of March 31, 2023 , the Company had outstanding letters of credit of $ 1.1 million securing lease obligations, labor and performance guaranties.

Leases

Leases	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Leases	6. LEASES As of March 31, 2023 , the Company leased-in one anchor handling towing supply vessel (“AHTS”), one FSV, 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 March 31, 2023 , the remaining lease terms of the vessels had a duration ranging from 18 to 48 months. The lease terms of certain facilities and other equipment had a duration ranging from three to 285 months. As of March 31, 2023, future minimum payments for leases for the remainder of 2023 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2023 $ 1,597 $ 612 2024 1,721 946 2025 645 959 2026 459 953 2027 400 4,659 Years subsequent to 2027 3,214 — 8,036 8,129 Interest component ( 1,798 ) ( 922 ) 6,238 7,207 Current portion of long-term lease liabilities 1,764 563 Long-term lease liabilities $ 4,474 $ 6,644 For the three months ended March 31, 2023 and 2022 the components of lease expense were as follows (in thousands): Three Months Ended March 31, 2023 2022 Operating lease cost $ 546 $ 908 Finance lease cost: Amortization of finance lease assets (1) 160 59 Interest on finance lease liabilities (2) 72 25 Short-term lease costs 174 152 $ 952 $ 1,144 (1) Included in amortization costs in the consolidated statements of income (loss) . (2) Included in interest expense in the consolidated statements of income (loss) . For the three months ended March 31, 2023 supplemental cash flow information related to leases was as follows (in thousands): 2023 Operating cash outflows from operating leases $ 641 Financing cash outflows from finance leases 114 Right-of-use assets obtained for operating lease liabilities 196 Right-of-use assets obtained for finance lease liabilities — For the three months ended March 31, 2023 other information related to leases was as follows: 2023 Weighted average remaining lease term, in years - operating leases 9.8 Weighted average remaining lease term, in years - finance leases 4.0 Weighted average discount rate - operating leases 6.8 % Weighted average discount rate - finance leases 4.0 %

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	7. INCOME TAXES The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the three months ended March 31, 2023: Statutory rate ( 21.00 )% Exclusion of foreign subsidiaries with current year losses and withholding tax 31.80 % Other 2.09 % Effective income tax rate 12.89 %

Derivative Instruments and Hedg

Derivative Instruments and Hedging Strategies	3 Months Ended
	Mar. 31, 2023
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Strategies	8. DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES Derivative instruments are classified as either assets, which are included in other receivables in the accompanying consolidated balance sheets, or liabilities based on their individual fair values. The fair values of the Company’s derivative instruments were as follows (in thousands): March 31, 2023 December 31, 2022 Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Interest rate swap agreements (cash flow hedges) $ 387 $ — $ 526 $ — Economic Hedges. The Company enters and settles forward currency exchange, option and future contracts with respect to various foreign currencies. These contracts enable the Company to buy currencies in the future at fixed exchange rates, which could offset possible consequences of changes in currency exchange rates with respect to the Company’s business conducted outside of the U.S. The Company generally does not enter into contracts with forward settlement dates beyond 12 to 18 months. As of March 31, 2023, the Company had no open forward currency exchange contracts. Cash Flow Hedges. The Company has interest rate swap agreements designated as cash flow hedges. By entering into these interest rate swap agreements, the Company has converted the variable LIBOR component of certain of their outstanding borrowings to a fixed interest rate. The Company recognized losses on derivative instruments designated as cash flow hedges of $ 0.2 million for the three months ended March 31, 2023 and gains of $ 1.2 million for the three months ended March 31, 2022, respectively, as a component of other comprehensive income (loss). As of March 31, 2023, the interest rate swaps held by the Company were as follows: • 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 $ 5.6 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 $ 30.5 million and receive a variable interest rate based on LIBOR on the amortized notional value; and • SEACOR 88 LLC and SEACOR 888 LLC, both indirect wholly-owned subsidiaries of SEACOR Marine (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 3.175 % 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. Other Derivative Instruments. The Company had no derivative instruments not designated as hedging instruments for the three months ended March 31, 2023 and recognized losses on derivative instruments not designated as hedging instruments for the three months ended March 31, 2022 as follows (in thousands): Three Months Ended March 31, 2023 2022 Conversion option liability on Old Convertible Notes $ — $ ( 34 ) The conversion option liability related to the bifurcated embedded conversion option in the Old Convertible Notes, issued to investment funds managed and controlled by The Carlyle Group, were exchanged for the New Convertible Notes during the fourth quarter of 2022.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	9. 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 March 31, 2023 and December 31, 2022 that are measured at fair value on a recurring basis were as follows (in thousands): March 31, 2023 Level 1 Level 2 Level 3 ASSETS Derivative instruments $ — $ 387 $ — December 31, 2022 ASSETS Derivative instruments $ — $ 526 $ — The estimated fair values of the Company’s other financial assets and liabilities as of March 31, 2023 and December 31, 2022 were as follows (in thousands): Estimated Fair Value March 31, 2023 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 43,652 $ 43,652 $ — $ — LIABILITIES Long-term debt, including current portion 314,973 — 310,090 — December 31, 2022 ASSETS Cash, cash equivalents and restricted cash $ 43,045 $ 43,045 $ — $ — LIABILITIES Long-term debt, including current portion 321,631 — 314,979 — 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. 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. Property and equipment . During the three months ended March 31, 2023 , the Company recognized no impairment charges. During the year ended December 31, 2022 , the Company recognized impairment charges totaling $ 2.9 million. The Company recorded impairment charges of $ 0.9 million for one FSV classified as held for sale and sold during 2022. In addition, the Company recorded impairment charges of $ 0.7 million for one leased-in AHTS as it is not expected to return to active service during its remaining lease term. Additionally, the Company recorded impairment charges of $ 1.3 million for other equipment and classified such equipment as assets held for sale, which was subsequently sold in the first quarter of 2023.

Warrants

Warrants	3 Months Ended
	Mar. 31, 2023
Warrants and Rights Note Disclosure [Abstract]
Warrants	10. WARRANTS In connection with various transactions, the Company issued 2,560,456 warrants to purchase shares of Common Stock at an exercise price of $ 0.01 per share (“Warrants”). On January 17, 2023, 117,515 Warrants were exercised, resulting in 1,321,968 Warrants outstanding as of March 31, 2023 , which are comprised entirely of the remaining Carlyle Warrants. In connection with the exercise of Warrants on January 17, 2023, 121 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. COMMITMENTS AND CONTINGENCIES As of March 31, 2023 , the Company had unfunded capital commitments of $ 1.7 million for miscellaneous vessel equipment payable during the remainder of 2023. The Company has indefinitely deferred an additional $ 9.3 million of orders with respect to one FSV that the Company had previously reported as unfunded capital commitments. In December 2015, the Brazilian Federal Revenue Office issued a tax-deficiency notice to Seabulk Offshore do Brasil Ltda, an indirect wholly-owned subsidiary of SEACOR Marine (“Seabulk Offshore do Brasil”), with respect to certain profit participation contributions (also known as “PIS”) and social security financing contributions (also known as “COFINS”) requirements alleged to be due from Seabulk Offshore do Brasil (“Deficiency Notice”) in respect of the period of January 2011 until December 2012. In January 2016, the Company administratively appealed the Deficiency Notice on the basis that, among other arguments, (i) such contributions were not applicable in the circumstances of a 70 %/ 30 % cost allocation structure, and (ii) the tax inspector had incorrectly determined that values received from outside of Brazil could not be classified as expense refunds. The initial appeal was dismissed by the Brazilian Federal Revenue Office and the Company appealed such dismissal and is currently awaiting an administrative trial. A local Brazilian law has been enacted that supports the Company’s position that such contribution requirements are not applicable, but it is uncertain whether such law will be taken into consideration with respect to administrative proceedings commenced prior to the enactment of the law. Accordingly, the success of Seabulk Offshore do Brasil in the administrative proceedings cannot be assured and the matter may need to be addressed through judicial court proceedings. The potential levy arising from the Deficiency Notice is R$ 21.3 million based on a historical potential levy of R$ 12.87 million (USD $ 4.2 million and USD $ 2.5 million, respectively, based on the exchange rate as of March 31, 2023). On April 13, 2021, the SEACOR Power, a liftboat owned by a subsidiary of the Company with nineteen individuals on board, capsized off the coast of Port Fourchon, Louisiana. The incident resulted in the death of several crew members, including the captain of the vessel and five other employees of the Company. The incident also resulted in the constructive total loss of the SEACOR Power. The Company is responsible for the salvage operations related to the vessel in coordination with the U.S. Coast Guard (“USCG”). The salvage operations are substantially complete and the Company expects salvage costs to be covered by insurance proceeds. The capsizing of the SEACOR Power garnered significant attention from the media as well as local, state and federal stakeholders. The National Transportation Safety Board (“NTSB”) and the USCG have each conducted an investigation to determine the cause of the incident. The Company has and will continue to fully cooperate with the investigations in all respects. On November 3, 2022, the NTSB publicly released its final report, as adopted on October 18, 2022, which determined that the probable cause of the capsizing of the SEACOR Power was a loss of stability that occurred when the vessel was struck by severe thunderstorm winds, which exceeded the vessel’s operation wind speed limits. The NTSB further determined that contributing to the loss of life on the vessel were the speed at which the vessel capsized and the angle at which it came to rest, which made egress difficult, and the high winds and seas in the aftermath of the capsizing, which hampered rescue efforts. The USCG is also expected to release a report on its investigation although the timing of such release is uncertain. Numerous civil lawsuits have been filed against the Company and other third parties by the family members of deceased crew members and the surviving crew members employed by the Company or by third parties. On June 2, 2021, the Company filed a Limitation of Liability Act complaint in federal court in the Eastern District of Louisiana (“Limitation Action”), which had the effect of enjoining all existing civil lawsuits and requiring the plaintiffs to file their claims relating to the capsizing of the SEACOR Power in the Limitation Action. Nearly all injury and death claims in the Limitation Action for which the Company has financial exposure have been resolved, and the remaining claims are those for which the Company is owed contractual defense and indemnity or will be covered by insurance. There is significant uncertainty regarding the impact the incident will have on the Company’s reputation and the resulting possible impact on the Company’s business. In the normal course of its business, the Company becomes involved in various other litigation matters including, among others, 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 that such changes in estimated costs would have a material effect on the Company’s consolidated financial position, results of operations or cash flows. Certain of the Company’s subsidiaries are participating employers in two industry-wide, multi-employer, defined benefit pension funds in the United Kingdom: the U.K Merchant Navy Officers Pension Fund (“MNOPF”) and the U.K. Merchant Navy Ratings Pension Fund (“MNRPF”). The Company’s participation in the MNOPF began with the acquisition of the Stirling group of companies (the “Stirling Group”) in 2001 and relates to certain officers employed between 1978 and 2002 by the Stirling Group and/or its predecessors. The Company’s participation in the MNRPF also began with the acquisition of the Stirling Group in 2001 and relates to ratings employed by the Stirling Group and/or its predecessors through today. Both of these plans are in deficit positions and, depending upon the results of future actuarial valuations, it is possible that the plans could experience funding deficits that will require the Company to recognize payroll related operating expenses in the periods invoices are received. As of March 31, 2023, all invoices related to MNOPF and MNRPF have been settled in full. On October 19, 2021, the Company was informed by the MNRPF that two issues had been identified during a review of the MNRPF by the applicable trustee that would potentially give rise to material additional liabilities for the MNRPF. The MNRPF has indicated that the investigations into these issues remain ongoing, and that further updates will be provided as significant developments arise. Should such additional liabilities require the MNRPF to collect additional funds from participating employers, it is possible that the Company will be invoiced for a portion of such funds and recognize payroll related operating expenses in the periods invoices are received.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	12. STOCK BASED COMPENSATION Transactions in connection with the Company’s Equity Incentive Plans during the three months ended March 31, 2023 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2022 1,682,193 Granted 594,368 Vested ( 588,629 ) Forfeited ( 15,000 ) Outstanding as of March 31, 2023 (1) 1,672,932 Stock Option Activity: Outstanding as of December 31, 2022 1,026,865 Granted — Exercised ( 834 ) Forfeited — Outstanding as of March 31, 2023 1,026,031 (1) Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest. For the three months ended March 31, 2023 , the Company acquired for treasury 220,207 shares of Common Stock from its directors and/or employees to cover their tax withholding obligations upon the lapsing of restrictions on share awards for an aggregate purchase price of $ 2.3 million. These shares were purchased in accordance with the terms of the Company’s 2017 Equity Incentive Plan, 2020 Equity Incentive Plan and 2022 Equity Incentive Plan, as applicable.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Segment Information	13. SEGMENT INFORMATION The Company’s segment presentation and basis of measurement of segment profit or loss are as previously described in the 2022 Annual Report. The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United Africa Middle Latin Total For the Three Months Ended March 31, 2023 Operating Revenues: Time charter $ 6,564 $ 18,996 $ 16,028 $ 13,827 $ 55,415 Bareboat charter — — — 360 360 Other marine services 3,842 ( 834 ) ( 142 ) 1,332 4,198 10,406 18,162 15,886 15,519 59,973 Direct Costs and Expenses: Operating: Personnel 6,535 4,505 4,841 3,922 19,803 Repairs and maintenance 1,194 2,553 677 1,587 6,011 Drydocking 43 1,184 ( 1,095 ) ( 119 ) 13 Insurance and loss reserves 1,041 318 1,185 245 2,789 Fuel, lubes and supplies 783 2,215 1,142 679 4,819 Other 223 1,690 1,327 598 3,838 9,819 12,465 8,077 6,912 37,273 Direct Vessel Profit $ 587 $ 5,697 $ 7,809 $ 8,607 22,700 Other Costs and Expenses: Lease expense $ 136 $ 429 $ 76 $ 79 720 Administrative and general 11,632 Depreciation and amortization 3,535 3,925 3,688 2,614 13,762 26,114 Gains on asset dispositions and impairments, net 3,599 Operating income $ 185 As of March 31, 2023 Property and Equipment: Historical Cost $ 208,241 $ 287,168 $ 286,795 $ 187,124 $ 969,328 Accumulated Depreciation ( 99,165 ) ( 96,086 ) ( 93,132 ) ( 35,814 ) ( 324,197 ) $ 109,076 $ 191,082 $ 193,663 $ 151,310 $ 645,131 Total Assets (1) $ 146,209 $ 216,899 $ 213,461 $ 172,575 $ 749,144 (1) Total assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 . United Africa Middle Latin Total For the Three Months Ended March 31, 2022 Operating Revenues: Time charter $ 7,864 $ 12,280 $ 13,660 $ 8,937 $ 42,741 Bareboat charter — — — 618 618 Other 2,052 ( 616 ) 49 747 2,232 9,916 11,664 13,709 10,302 45,591 Direct Costs and Expenses: Operating: Personnel 4,923 3,536 6,031 3,945 18,435 Repairs and maintenance 1,101 1,579 1,832 2,279 6,791 Drydocking 2,867 1,144 962 — 4,973 Insurance and loss reserves 229 124 507 326 1,186 Fuel, lubes and supplies 662 1,473 1,010 584 3,729 Other 224 1,828 1,627 703 4,382 10,006 9,684 11,969 7,837 39,496 Direct Vessel (Loss) Profit $ ( 90 ) $ 1,980 $ 1,740 $ 2,465 6,095 Other Costs and Expenses: Lease expense $ 287 $ 402 $ 31 $ 340 1,060 Administrative and general 9,924 Depreciation and amortization 4,638 3,258 4,345 2,130 14,371 25,355 Gains on asset dispositions and impairments, net 2,139 Operating loss $ ( 17,121 ) As of March 31, 2022 Property and Equipment: Historical Cost $ 280,472 $ 241,607 $ 335,121 $ 149,673 $ 1,006,873 Accumulated Depreciation ( 130,455 ) ( 77,502 ) ( 86,682 ) ( 21,805 ) ( 316,444 ) $ 150,017 $ 164,105 $ 248,439 $ 127,868 $ 690,429 Total Assets (1) $ 173,269 $ 181,526 $ 254,749 $ 208,711 $ 818,255 (1) Total assets by region does not include corporate assets of $ 84.4 million as of March 31, 2022 . The Company’s investments in 50 % or less owned companies, which are accounted for under the equity method, also contribute to its consolidated results of operations. As of March 31, 2023, and 2022 , the Company’s investments, at equity and advances to 50 % or less owned companies in its other 50 % or less owned companies were $ 3.6 million and $ 76.9 million, respectively. The significant decrease is the result of the sale of the Company’s interests in MexMar and Offshore Vessels Holding, S.A.P.I. de C.V. (“OVH”). Equity in earnings of 50% or less owned companies for the three months ended March 31, 2023 and 2022 were $ 0.5 million and $ 5.7 million, respectively.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	14. SUBSEQUENT EVENTS The Company has evaluated subsequent events through the filing of this Quarterly Report on Form 10-Q and determined that there have been no material events that have occurred that are not properly recognized and/or disclosed in the consolidated financial statements.

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards. On October 29, 2020, the FASB issued ASU 2020-10, Codification Improvements: Amendments that improve the consistency of the Codification by including all disclosure guidance in the appropriate disclosure section. The guidance was effective for annual periods beginning after December 15, 2020, and interim periods within the annual periods beginning after December 15, 2022. The adoption of the standard did not have a material effect on the disclosures included herein. On August 5, 2020, the FASB issued ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity, which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. The Company adopted the new standard on January 1, 2022 . The adoption of the standard by the Company did no t have a material impact on its consolidated financial position or on its results of operations, cash flows and disclosures.
Basis of Consolidation	Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include those related to deferred revenues, allowance for credit loss accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from estimates and those differences may be material.
Revenue Recognition	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. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of Mexico, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contract or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. 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 vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 740 4,288 Revenues recognized and reclassifications during the period ( 1,586 ) ( 3,561 ) Balance at end of period $ 1,487 $ 2,333 As of March 31, 2023 , the Company had $ 1.5 million of unearned revenue primarily related to mobilization of vessels and had no deferred revenues.
Cash and Cash Equivalents	Cash and Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents.
Restricted Cash	Restricted Cash. Restricted cash primarily relates to banking facility requirements.
Trade and Other Receivables	Trade and Other Receivables. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables, but excludes our short-term note receivable. During the three months ended March 31, 2023 , the Company recorded $ 2.2 million of insurance receivables that offset operating expenses. These insurance receivables related to costs that were recorded as operating expenses in 2022 and were previously disclosed as a gain contingency. The Company routinely reviews its receivables and makes provisions for the credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. Trade receivables are deemed uncollectible and are removed from accounts receivable and the allowance for credit losses when collection efforts have been exhausted.
Property and Equipment	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 vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date. As of March 31, 2023 , the estimated useful life of the Company’s new offshore support vessels was 20 years. 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. There was no capitalized interest recognized during the three months ended March 31, 2023 and 2022 .
Impairment of Long-Lived Assets and Impairment of 50% or Less Owned Companies	Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations 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 their estimated future 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. For the three months ended March 31, 2023 , the Company did no t record an impairment on any owned or leased-in vessels. For the three months ended March 31, 2022 , the Company recorded impairment charges of $ 0.9 million for one fast support vessel (“FSV”) classified as held for sale during the first quarter of 2022 and sold during the second quarter of 2022. Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of March 31, 2023, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third-party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the three months ended March 31, 2023 and 2022 , the Company did no t recognize any impairment charges related to its 50% or less owned companies.
Income Taxes	Income Taxes. During the three months ended March 31, 2023 , the Company’s effective income tax rate of 12.89 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes and foreign losses for which there is no benefit in the U.S.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive (loss) income 668 ( 152 ) 516 Balance as of March 31, 2023 $ 7,000 $ 363 $ 7,363
Earnings (Loss) Per Share	Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of the Company is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic earnings/loss per share of Common Stock because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted earnings/loss per share of Common Stock is computed based on the weighted average number of shares of Common Stock 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 shares of Common Stock have been issued and outstanding during the relevant periods pursuant to the conversion of the Old Convertible Notes and the New Convertible Notes unless anti-dilutive. For the three months ended March 31, 2023 , diluted loss per share of Common Stock excluded 2,978,274 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. For the three months ended March 31, 2022 , diluted loss per share of Common Stock excluded 2,907,500 shares of Common Stock issuable upon conversion of the Old Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three months ended March 31, 2023 and 2022 diluted loss per share of Common Stock excluded 1,672,932 and 1,469,647 shares of restricted stock, respectively, and 1,026,031 and 1,029,365 shares of Common Stock, respectively, issuable upon exercise of outstanding stock options as the effect of their inclusion in the computation would be anti-dilutive.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2023
Basis Of Presentation And Accounting Policies [Abstract]
Schedule of Deferred Revenues	Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 740 4,288 Revenues recognized and reclassifications during the period ( 1,586 ) ( 3,561 ) Balance at end of period $ 1,487 $ 2,333
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive (loss) income 668 ( 152 ) 516 Balance as of March 31, 2023 $ 7,000 $ 363 $ 7,363

Investments, at Equity, and A_2

Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)	3 Months Ended
	Mar. 31, 2023
Schedule Of Investments [Abstract]
Equity Method Investments	Investments, at equity, and advances to 50% or less owned companies as of March 31, 2023 and December 31, 2022 were as follows (in thousands): Ownership 2023 2022 Seabulk Angola 49.0 % 2,017 1,683 SEACOR Arabia 45.0 % 1,501 1,265 Other 20.0 % - 50.0 % 76 76 $ 3,594 $ 3,024

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Obligations	The Company’s long-term debt obligations as of March 31, 2023 and December 31, 2022 were as follows (in thousands): March 31, 2023 December 31, 2022 Recourse long-term debt (1) : Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 SEACOR Marine Foreign Holdings Credit Facility 64,507 67,910 Sea-Cat Crewzer III Term Loan Facility 15,465 16,703 SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt 16,205 16,205 SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing 75,314 77,537 SEACOR Alpine Shipyard Financing 27,087 27,790 SEACOR 88/888 Term Loan 5,500 5,500 Tarahumara Shipyard Financing 5,056 5,597 SEACOR Offshore OSV 15,552 16,052 Total recourse long-term debt 349,686 358,294 Non-recourse long-term debt (2) : SEACOR 88/888 Term Loan 5,500 5,500 Total non-recourse long-term debt 5,500 5,500 Total principal due for long-term debt 355,186 363,794 Current portion due within one year ( 60,523 ) ( 61,512 ) Unamortized debt discount ( 35,950 ) ( 37,511 ) Deferred financing costs ( 4,263 ) ( 4,652 ) Long-term debt, less current portion $ 254,450 $ 260,119 (1) Recourse debt represents debt issued by SEACOR Marine and/or its subsidiaries and guaranteed by SEACOR Marine or one of its operating subsidiaries as provided in the relevant debt agreements. (2) Non-recourse debt represents debt issued by one of the Company’s consolidated subsidiaries with no recourse to SEACOR Marine or its other non-debtor operating subsidiaries with respect to the applicable instrument, other than certain limited support obligations as provided in the respective debt agreements, which in aggregate are not considered to be material to the Company’s business and financial condition.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Summary of Future Minimum Payments for Leases	As of March 31, 2023, future minimum payments for leases for the remainder of 2023 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2023 $ 1,597 $ 612 2024 1,721 946 2025 645 959 2026 459 953 2027 400 4,659 Years subsequent to 2027 3,214 — 8,036 8,129 Interest component ( 1,798 ) ( 922 ) 6,238 7,207 Current portion of long-term lease liabilities 1,764 563 Long-term lease liabilities $ 4,474 $ 6,644
Summary of Components of Leases Expense	For the three months ended March 31, 2023 and 2022 the components of lease expense were as follows (in thousands): Three Months Ended March 31, 2023 2022 Operating lease cost $ 546 $ 908 Finance lease cost: Amortization of finance lease assets (1) 160 59 Interest on finance lease liabilities (2) 72 25 Short-term lease costs 174 152 $ 952 $ 1,144 (1) Included in amortization costs in the consolidated statements of income (loss) . (2) Included in interest expense in the consolidated statements of income (loss) .
Summary of Supplemental Cash Flow Information Related to Leases	For the three months ended March 31, 2023 supplemental cash flow information related to leases was as follows (in thousands): 2023 Operating cash outflows from operating leases $ 641 Financing cash outflows from finance leases 114 Right-of-use assets obtained for operating lease liabilities 196 Right-of-use assets obtained for finance lease liabilities —
Summary of Other Information Related to Leases	For the three months ended March 31, 2023 other information related to leases was as follows: 2023 Weighted average remaining lease term, in years - operating leases 9.8 Weighted average remaining lease term, in years - finance leases 4.0 Weighted average discount rate - operating leases 6.8 % Weighted average discount rate - finance leases 4.0 %

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the three months ended March 31, 2023: Statutory rate ( 21.00 )% Exclusion of foreign subsidiaries with current year losses and withholding tax 31.80 % Other 2.09 % Effective income tax rate 12.89 %

Derivative Instruments and He_2

Derivative Instruments and Hedging Strategies (Tables)	3 Months Ended
	Mar. 31, 2023
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): March 31, 2023 December 31, 2022 Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Interest rate swap agreements (cash flow hedges) $ 387 $ — $ 526 $ —
Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments	The Company had no derivative instruments not designated as hedging instruments for the three months ended March 31, 2023 and recognized losses on derivative instruments not designated as hedging instruments for the three months ended March 31, 2022 as follows (in thousands): Three Months Ended March 31, 2023 2022 Conversion option liability on Old Convertible Notes $ — $ ( 34 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2023
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 March 31, 2023 and December 31, 2022 that are measured at fair value on a recurring basis were as follows (in thousands): March 31, 2023 Level 1 Level 2 Level 3 ASSETS Derivative instruments $ — $ 387 $ — December 31, 2022 ASSETS Derivative instruments $ — $ 526 $ —
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 March 31, 2023 and December 31, 2022 were as follows (in thousands): Estimated Fair Value March 31, 2023 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 43,652 $ 43,652 $ — $ — LIABILITIES Long-term debt, including current portion 314,973 — 310,090 — December 31, 2022 ASSETS Cash, cash equivalents and restricted cash $ 43,045 $ 43,045 $ — $ — LIABILITIES Long-term debt, including current portion 321,631 — 314,979 —

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Equity Incentive Plan Transactions	Transactions in connection with the Company’s Equity Incentive Plans during the three months ended March 31, 2023 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2022 1,682,193 Granted 594,368 Vested ( 588,629 ) Forfeited ( 15,000 ) Outstanding as of March 31, 2023 (1) 1,672,932 Stock Option Activity: Outstanding as of December 31, 2022 1,026,865 Granted — Exercised ( 834 ) Forfeited — Outstanding as of March 31, 2023 1,026,031 (1) Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2023
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 Africa Middle Latin Total For the Three Months Ended March 31, 2023 Operating Revenues: Time charter $ 6,564 $ 18,996 $ 16,028 $ 13,827 $ 55,415 Bareboat charter — — — 360 360 Other marine services 3,842 ( 834 ) ( 142 ) 1,332 4,198 10,406 18,162 15,886 15,519 59,973 Direct Costs and Expenses: Operating: Personnel 6,535 4,505 4,841 3,922 19,803 Repairs and maintenance 1,194 2,553 677 1,587 6,011 Drydocking 43 1,184 ( 1,095 ) ( 119 ) 13 Insurance and loss reserves 1,041 318 1,185 245 2,789 Fuel, lubes and supplies 783 2,215 1,142 679 4,819 Other 223 1,690 1,327 598 3,838 9,819 12,465 8,077 6,912 37,273 Direct Vessel Profit $ 587 $ 5,697 $ 7,809 $ 8,607 22,700 Other Costs and Expenses: Lease expense $ 136 $ 429 $ 76 $ 79 720 Administrative and general 11,632 Depreciation and amortization 3,535 3,925 3,688 2,614 13,762 26,114 Gains on asset dispositions and impairments, net 3,599 Operating income $ 185 As of March 31, 2023 Property and Equipment: Historical Cost $ 208,241 $ 287,168 $ 286,795 $ 187,124 $ 969,328 Accumulated Depreciation ( 99,165 ) ( 96,086 ) ( 93,132 ) ( 35,814 ) ( 324,197 ) $ 109,076 $ 191,082 $ 193,663 $ 151,310 $ 645,131 Total Assets (1) $ 146,209 $ 216,899 $ 213,461 $ 172,575 $ 749,144 (1) Total assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 . United Africa Middle Latin Total For the Three Months Ended March 31, 2022 Operating Revenues: Time charter $ 7,864 $ 12,280 $ 13,660 $ 8,937 $ 42,741 Bareboat charter — — — 618 618 Other 2,052 ( 616 ) 49 747 2,232 9,916 11,664 13,709 10,302 45,591 Direct Costs and Expenses: Operating: Personnel 4,923 3,536 6,031 3,945 18,435 Repairs and maintenance 1,101 1,579 1,832 2,279 6,791 Drydocking 2,867 1,144 962 — 4,973 Insurance and loss reserves 229 124 507 326 1,186 Fuel, lubes and supplies 662 1,473 1,010 584 3,729 Other 224 1,828 1,627 703 4,382 10,006 9,684 11,969 7,837 39,496 Direct Vessel (Loss) Profit $ ( 90 ) $ 1,980 $ 1,740 $ 2,465 6,095 Other Costs and Expenses: Lease expense $ 287 $ 402 $ 31 $ 340 1,060 Administrative and general 9,924 Depreciation and amortization 4,638 3,258 4,345 2,130 14,371 25,355 Gains on asset dispositions and impairments, net 2,139 Operating loss $ ( 17,121 ) As of March 31, 2022 Property and Equipment: Historical Cost $ 280,472 $ 241,607 $ 335,121 $ 149,673 $ 1,006,873 Accumulated Depreciation ( 130,455 ) ( 77,502 ) ( 86,682 ) ( 21,805 ) ( 316,444 ) $ 150,017 $ 164,105 $ 248,439 $ 127,868 $ 690,429 Total Assets (1) $ 173,269 $ 181,526 $ 254,749 $ 208,711 $ 818,255 (1) Total assets by region does not include corporate assets of $ 84.4 million as of March 31, 2022 .

Basis of Presentation and Acc_4

Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Basis Of Presentation And Accounting Policies [Line Items]
Deferred revenue	$ 0
Unearned revenue	1,487,000		$ 2,333,000	$ 1,606,000
Insurance receivables related to costs that were recorded as operating expenses	2,200,000
Capitalized interest costs, including allowance for funds used during construction, total	$ 0	$ 0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Gains on asset dispositions and impairments, net
Impairment of long-lived assets owned or leased in vessels	$ 0
Equity method investment, other than temporary impairment	$ 0	$ 0
Effective income tax rate reconciliation, percent, total	12.89%
Class of warrant or right, exercise price of warrants or rights	$ 0.01
Convertible Debt Securities
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	2,978,274	2,907,500
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,672,932	1,469,647
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,026,031	1,029,365
Fast Support Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges		$ 900,000	900,000
Anchor Handling Towing Supply Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment of long-lived assets owned or leased in vessels			700,000
Tower and Gangway
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges			$ 1,300,000
Offshore Support Vessels
Basis Of Presentation And Accounting Policies [Line Items]
Estimated useful life (Year)	20 years
Equity Investments in 50% or Less Owned Companies | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	20%
Equity Investments in 50% or Less Owned Companies | Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%	50%
Equity Investments in 50% or Less Owned Companies | SEACOR Marine Foreign Holdings | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%
Accounting Standards Update 2020-10
Basis Of Presentation And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true
Accounting Standards Update 2020-06
Basis Of Presentation And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022
Change in accounting principle, accounting standards update, immaterial effect [true false]	true

Basis of Presentation and Acc_5

Basis of Presentation and Accounting Policies - Schedule of Deferred Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Basis Of Presentation And Accounting Policies [Abstract]
Balance at beginning of period	$ 2,333	$ 1,606
Revenues deferred during the period	740	4,288
Revenues recognized and reclassifications during the period	(1,586)	(3,561)
Balance at end of period	$ 1,487	$ 2,333

Basis of Presentation and Acc_6

Basis of Presentation and Accounting Policies - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 379,146	$ 446,541
Other comprehensive (loss) income	516	798
Balance	369,040	433,044
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	6,332
Other comprehensive (loss) income	668
Balance	7,000
Derivative Gains (Losses) on Cash Flow Hedges, net Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	515
Other comprehensive (loss) income	(152)
Balance	363
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	6,847	8,055
Other comprehensive (loss) income	516
Balance	$ 7,363	$ 8,853

Note Receivable - Additional In

Note Receivable - Additional Information (Details) - USD ($)	Sep. 29, 2022	Mar. 31, 2023
MexMar Original Facility Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan balance due		$ 10,000,000
MexMar Original Facility Agreement | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal of loan	$ 28,800,000
MexMar Third A&R Facility Agreement | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal of loan	20,000,000
Prepayment of outstanding loan	$ 8,800,000
Maturity date	Sep. 30, 2023
Frequency of principal repayment	four quarterly installments
Principal repayment of loan	$ 5,000,000

Equipment Acquisitions and Di_2

Equipment Acquisitions and Dispositions - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) Vessel
Property Plant And Equipment [Line Items]
Equipment deliveries	$ 0
Proceeds from disposition of property and equipment	7,611	$ 5,310
Gain (loss) on disposition of property, plant and equipment		$ 3,100
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Payments to acquire property, plant, and equipment, including fair value hedges	500
Liftboat
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel		1
Proceeds from disposition of property and equipment		$ 5,300
Platform Supply Vessels And Fast Support Vessels
Property Plant And Equipment [Line Items]
Proceeds from disposition of property and equipment	7,600
Gain (loss) on disposition of property, plant and equipment	$ 2,600

Investments, at Equity, and A_3

Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Schedule Of Investments [Line Items]
Investments at equity	$ 3,594	$ 3,024
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49%
Investments at equity	$ 2,017	1,683
SEACOR Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45%
Investments at equity	$ 1,501	1,265
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 76	$ 76	$ 76,900
Other Offshore Marine Services Joint Ventures | Minimum
Schedule Of Investments [Line Items]
Ownership percentage	20%
Other Offshore Marine Services Joint Ventures | Maximum
Schedule Of Investments [Line Items]
Ownership percentage	50%		50%

Long Term Debt - Schedule of Lo

Long Term Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 355,186	$ 363,794
Current portion due within one year	(60,523)	(61,512)
Unamortized debt discount	(35,950)	(37,511)
Deferred financing costs	(4,263)	(4,652)
Long-term debt, less current portion	254,450	260,119
Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	349,686	358,294
Non-Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	5,500	5,500
Guaranteed Notes | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	90,000	90,000
New Convertible Notes | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	35,000	35,000
SEACOR Marine Foreign Holdings Credit Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	64,507	67,910
Sea-Cat Crewzer III Term Loan Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	15,465	16,703
SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	16,205	16,205
SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	75,314	77,537
SEACOR Alpine Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	27,087	27,790
SEACOR 88/888 Term Loan | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	5,500	5,500
SEACOR 88/888 Term Loan | Non-Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	5,500	5,500
SEACOR Offshore OSV | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	15,552	16,052
Tarahumara Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 5,056	$ 5,597

Long Term Debt - Additional Inf

Long Term Debt - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2023 USD ($) $ / shares	Jun. 30, 2023
Debt Instrument [Line Items]
Class of warrant or right, exercise price of warrants or rights | $ / shares	$ 0.01
Long-term Debt Obligation
Debt Instrument [Line Items]
Letters of credit outstanding, amount | $	$ 1.1
SEACOR Marine Foreign Holdings Credit Facility
Debt Instrument [Line Items]
Interest coverage ratio	2
SEACOR Marine Foreign Holdings Credit Facility | Forecast
Debt Instrument [Line Items]
Interest coverage ratio		1.50

Leases - Additional Information

Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2023 Vessel
Anchor Handling Towing Supply Vessels
Lessee Lease Description [Line Items]
Number of operating leases on equipment	1
Fast Support Vessel
Lessee Lease Description [Line Items]
Number of financing leases on equipment	1
Vessels | Minimum
Lessee Lease Description [Line Items]
Operating and finance lease, lease terms (in duration)	18 months
Vessels | Maximum
Lessee Lease Description [Line Items]
Operating and finance lease, lease terms (in duration)	48 months
Other Equipment | Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	3 months
Other Equipment | Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	285 months

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Payments For Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Operating Leases
Remainder of 2023	$ 1,597
2024	1,721
2025	645
2026	459
2027	400
Years subsequent to 2027	3,214
Operating lease payments due	8,036
Interest component	(1,798)
Total operating leases	6,238
Current portion of operating lease liabilities	1,764	$ 2,358
Long-term operating lease liabilities	4,474	4,739
Finance Leases
Remainder of 2023	612
2024	946
2025	959
2026	953
2027	4,659
Years subsequent to 2027	0
Total finance leases	8,129
Interest component	(922)
Finance Leases	7,207
Current portion of finance lease liabilities	563	468
Long-term finance lease liabilities	$ 6,644	$ 6,781

Leases - Summary of Components

Leases - Summary of Components of Leases Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost		$ 546	$ 908
Finance lease cost:
Amortization of finance lease assets	[1]	160	59
Interest on lease liabilities	[2]	72	25
Short-term lease costs		174	152
Total lease expense		$ 952	$ 1,144
[1] Included in amortization costs in the consolidated statements of income (loss) Included in interest expense in the consolidated statements of income (loss)

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating cash outflows from operating leases	$ 641
Financing cash outflows from finance leases	114	$ 9
Right-of-use assets obtained for operating lease liabilities	196
Right-of-use assets obtained for finance lease liabilities	$ 0

Leases - Summary of Other Infor

Leases - Summary of Other Information Related to Leases (Details)	Mar. 31, 2023
Leases [Abstract]
Weighted average remaining lease term, in years - operating leases	9 years 9 months 18 days
Weighted average remaining lease term, in years - finance leases	4 years
Weighted average discount rate - operating leases	6.80%
Weighted average discount rate - finance leases	4%

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended
	Mar. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21%
Exclusion of foreign subsidiaries with current year losses and withholding tax	31.80%
Other	2.09%
Effective income tax rate	12.89%

Derivative Instruments and He_3

Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - Designated as Hedging Instrument - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 387	$ 526
Derivative Liability	$ 0	$ 0

Derivative Instruments and He_4

Derivative Instruments and Hedging Strategies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges	$ 14	$ 805
Equity Investments in 50% or Less Owned Companies | Maximum
Derivative [Line Items]
Equity method investment, ownership percentage	50%	50%
Cash Flow Hedging
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges	$ (200)	$ 1,200
Cash Flow Hedging | 3.32% Interest Rate Swap Agreement | Designated as Hedging Instrument | SEACOR Marine Foreign Holdings
Derivative [Line Items]
Derivative, fixed interest rate	3.32%
Derivative, notional amount	$ 5,600
Cash Flow Hedging | 3.195% Interest Rate Swap Agreement | Designated as Hedging Instrument | SEACOR Marine Foreign Holdings
Derivative [Line Items]
Derivative, fixed interest rate	3.195%
Derivative, notional amount	$ 30,500
Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument | SEACOR 88/888
Derivative [Line Items]
Derivative, fixed interest rate	3.175%
Derivative, notional amount	$ 5,500

Derivative Instruments and He_5

Derivative Instruments and Hedging Strategies - Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Embedded Derivative Financial Instruments
Derivative [Line Items]
Gains (losses) on derivative instruments	$ 0	$ 34

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 387	$ 526
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	$ 43,652	$ 43,045
Long-term debt, including current portion	314,973	321,631
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	43,652	43,045
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	$ 310,090	$ 314,979

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment charges	$ 0		$ 2,900,000
Impairment of long-lived assets owned or leased in vessels	$ 0
Fast Support Vessel
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets held for sale		$ 900,000	900,000
Anchor Handling Towing Supply Vessel
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets owned or leased in vessels			700,000
Tower and Gangway
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets held for sale			$ 1,300,000

Warrants - Additional Informati

Warrants - Additional Information (Details) - $ / shares	Jan. 17, 2023	Mar. 31, 2023	Dec. 31, 2022
Class of Warrant or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights		$ 0.01
Class of Warrant or Right, Outstanding		1,321,968
Number of shares withheld in an exercise to purchase warrants as payment for the exercise	121
Warrants Transactions
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			2,560,456
Class of warrant or right, exercise price of warrants or rights		$ 0.01
Class of warrant or right, exercised during period	117,515

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) R$ in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2023 BRL (R$)
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total	$ 1.7
Unrecorded unconditional purchase obligation indefinitely deferred	$ 9.3
Deficiency Notice
Commitments And Contingencies [Line Items]
Cost allocation percentage	70%
Deficiency Notice | Seabulk Overseas
Commitments And Contingencies [Line Items]
Cost allocation percentage	30%
Minimum | Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies	$ 4.2	R$ 21300
Maximum | Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies	$ 2.5	R$ 12870
FSV Offshore Support Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity	1	1

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details)	3 Months Ended
	Mar. 31, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	1,026,865
Granted (in shares)	0
Exercised (in shares)	(834)
Forfeited (in shares)	0
Outstanding as of the end of year (in shares)	1,026,031
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	1,682,193
Granted (in shares)	594,368
Vested (in shares)	(588,629)
Forfeited (in shares)	(15,000)
Outstanding as of the end of year (in shares)	1,672,932	[1]
[1] Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) (Parenthetical)	Mar. 31, 2023 shares
Performance Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	156,620

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Treasury stock, shares acquired	220,207
Treasury stock, value acquired cost method	$ 2,266	$ 672

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023		Mar. 31, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues	$ 59,973		$ 45,591
Direct Costs and Expenses	37,273		39,496
Direct Vessel Profit (Loss)	22,700		6,095
Lease expense	720		1,060
Administrative and general	11,632		9,924
Depreciation and amortization	13,762		14,371
Other Costs and Expenses	26,114		25,355
Gains on asset dispositions and impairments, net	3,599		2,139
Operating Loss	185		(17,121)
Historical cost	969,328		1,006,873		$ 967,683
Accumulated depreciation	(324,197)		(316,444)		(310,778)
Property and equipment	645,131		690,429		$ 656,905
Total Assets	749,144	[1]	818,255	[2]
Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	55,415		42,741
Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	360		618
Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	4,198		2,232
Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	19,803		18,435
Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	6,011		6,791
Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	13		4,973
Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,789		1,186
Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,819		3,729
Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,838		4,382
UNITED STATES
Segment Reporting Information [Line Items]
Operating Revenues	10,406		9,916
Direct Costs and Expenses	9,819		10,006
Direct Vessel Profit (Loss)	587		(90)
Lease expense	136		287
Depreciation and amortization	3,535		4,638
Historical cost	208,241		280,472
Accumulated depreciation	(99,165)		(130,455)
Property and equipment	109,076		150,017
Total Assets	146,209	[1]	173,269	[2]
UNITED STATES | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	6,564		7,864
UNITED STATES | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
UNITED STATES | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	3,842		2,052
UNITED STATES | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	6,535		4,923
UNITED STATES | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,194		1,101
UNITED STATES | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	43		2,867
UNITED STATES | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,041		229
UNITED STATES | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	783		662
UNITED STATES | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	223		224
Africa and Europe, Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues	18,162		11,664
Direct Costs and Expenses	12,465		9,684
Direct Vessel Profit (Loss)	5,697		1,980
Lease expense	429		402
Depreciation and amortization	3,925		3,258
Historical cost	287,168		241,607
Accumulated depreciation	(96,086)		(77,502)
Property and equipment	191,082		164,105
Total Assets	216,899	[1]	181,526	[2]
Africa and Europe, Continuing Operations | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	18,996		12,280
Africa and Europe, Continuing Operations | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
Africa and Europe, Continuing Operations | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	(834)		(616)
Africa and Europe, Continuing Operations | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,505		3,536
Africa and Europe, Continuing Operations | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,553		1,579
Africa and Europe, Continuing Operations | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,184		1,144
Africa and Europe, Continuing Operations | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	318		124
Africa and Europe, Continuing Operations | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,215		1,473
Africa and Europe, Continuing Operations | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,690		1,828
Middle East and Asia
Segment Reporting Information [Line Items]
Operating Revenues	15,886		13,709
Direct Costs and Expenses	8,077		11,969
Direct Vessel Profit (Loss)	7,809		1,740
Lease expense	76		31
Depreciation and amortization	3,688		4,345
Historical cost	286,795		335,121
Accumulated depreciation	(93,132)		(86,682)
Property and equipment	193,663		248,439
Total Assets	213,461	[1]	254,749	[2]
Middle East and Asia | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	16,028		13,660
Middle East and Asia | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
Middle East and Asia | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	(142)		49
Middle East and Asia | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,841		6,031
Middle East and Asia | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	677		1,832
Middle East and Asia | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	(1,095)		962
Middle East and Asia | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,185		507
Middle East and Asia | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,142		1,010
Middle East and Asia | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,327		1,627
Latin America
Segment Reporting Information [Line Items]
Operating Revenues	15,519		10,302
Direct Costs and Expenses	6,912		7,837
Direct Vessel Profit (Loss)	8,607		2,465
Lease expense	79		340
Depreciation and amortization	2,614		2,130
Historical cost	187,124		149,673
Accumulated depreciation	(35,814)		(21,805)
Property and equipment	151,310		127,868
Total Assets	172,575	[1]	208,711	[2]
Latin America | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	13,827		8,937
Latin America | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	360		618
Latin America | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	1,332		747
Latin America | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,922		3,945
Latin America | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,587		2,279
Latin America | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	(119)		0
Latin America | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	245		326
Latin America | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	679		584
Latin America | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	$ 598		$ 703
[1] Total assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 . Total assets by region does not include corporate assets of $ 84.4 million as of March 31, 2022 .

Segment Information - Schedul_2

Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Segment Reporting Information [Line Items]
Assets, Total	$ 803,546	$ 815,630
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets, Total	$ 54,400		$ 84,400

Segment Information - Additiona

Segment Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Information [Line Items]
Equity method investments	$ 3,594		$ 3,024
Equity in Gains (Losses) Earnings of 50% or Less Owned Companies	$ 500	$ 5,700
Equity Investments in 50% or Less Owned Companies | Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%
Other Offshore Marine Services Joint Ventures
Segment Information [Line Items]
Equity method investments	$ 76	$ 76,900	$ 76
Other Offshore Marine Services Joint Ventures | Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%