Helix Energy Solutions (HLX) 10-Q 24 Oct 24 2024 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Oct. 21, 2024
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-32936
Entity Registrant Name	HELIX ENERGY SOLUTIONS GROUP, INC.
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	95-3409686
Entity Address, Address Line One	3505 West Sam Houston Parkway North
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77043
City Area Code	281
Local Phone Number	618–0400
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	HLX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		152,103,502
Entity Central Index Key	0000866829
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 324,120	$ 332,191
Accounts receivable, net of allowance for credit losses of $3,882 and $3,407, respectively	270,883	280,427
Other current assets	98,934	85,223
Total current assets	693,937	697,841
Property and equipment	3,137,207	3,078,571
Less accumulated depreciation	(1,625,882)	(1,505,722)
Property and equipment, net	1,511,325	1,572,849
Operating lease right-of-use assets	338,245	169,233
Deferred recertification and dry dock costs, net	74,324	71,290
Other assets, net	43,318	44,823
Total assets	2,661,149	2,556,036
Current liabilities:
Accounts payable	142,400	134,552
Accrued liabilities	91,767	203,112
Current maturities of long-term debt	9,186	48,292
Current operating lease liabilities	59,866	62,662
Total current liabilities	303,219	448,618
Long-term debt	305,487	313,430
Operating lease liabilities	293,393	116,185
Deferred tax liabilities	123,722	110,555
Other non-current liabilities	64,758	66,248
Total liabilities	1,090,579	1,055,036
Commitments and contingencies
Shareholders' equity:
Common stock, no par, 240,000 shares authorized, 152,101 and 152,291 shares issued, respectively	1,270,347	1,271,565
Retained earnings	347,966	312,450
Accumulated other comprehensive loss	(47,743)	(83,015)
Total shareholders' equity	1,570,570	1,501,000
Total liabilities and shareholders' equity	$ 2,661,149	$ 2,556,036

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Allowance for credit losses	$ 3,882	$ 3,407
Shareholders' equity:
Common stock, par value (USD per share)	$ 0	$ 0
Common stock, shares authorized	240,000	240,000
Common stock, shares issued	152,101	152,291

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net revenues	$ 342,419	$ 395,670	$ 1,003,427	$ 954,571
Cost of sales	276,754	315,125	842,722	803,493
Gross profit	65,665	80,545	160,705	151,078
Gain (loss) on disposition of assets, net	100		(50)	367
Acquisition and integration costs				(540)
Change in fair value of contingent consideration		(16,499)		(31,319)
Selling, general and administrative expenses	(21,125)	(27,818)	(64,098)	(71,456)
Income from operations	44,640	36,228	96,557	48,130
Net interest expense	(5,689)	(4,152)	(17,057)	(12,567)
Losses related to convertible senior notes			(20,922)
Other expense, net	(49)	(8,257)	(2,647)	(10,553)
Royalty income and other	132	78	2,132	2,116
Income before income taxes	39,034	23,897	58,063	27,126
Income tax provision	9,520	8,337	22,547	9,631
Net income	$ 29,514	$ 15,560	$ 35,516	$ 17,495
Earnings per share of common stock:
Basic	$ 0.19	$ 0.10	$ 0.23	$ 0.12
Diluted	$ 0.19	$ 0.10	$ 0.23	$ 0.11
Weighted average common shares outstanding (in shares)
Basic	151,914	150,550	152,171	151,031
Diluted	154,851	153,622	155,038	153,936

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 29,514	$ 15,560	$ 35,516	$ 17,495
Other comprehensive income (loss), net of tax:
Foreign currency translation gain (loss)	41,689	(16,603)	35,272	4,114
Other comprehensive income (loss), net of tax	41,689	(16,603)	35,272	4,114
Comprehensive income (loss)	$ 71,203	$ (1,043)	$ 70,788	$ 21,609

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance, beginning of period at Dec. 31, 2022	$ 1,298,740	$ 323,288	$ (105,319)	$ 1,516,709
Balance, beginning of period (in shares) at Dec. 31, 2022	151,935
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		17,495		17,495
Foreign currency translation adjustments			4,114	4,114
Settlement of convertible debt conversion	$ (415)			(415)
Repurchases of common stock	$ (12,068)			(12,068)
Repurchases of common stock (in shares)	(1,584)
Activity in company stock plans, net and other	$ 185			185
Activity in company stock plans, net and other (in shares)	355
Share-based compensation	$ 4,498			4,498
Balance, end of period at Sep. 30, 2023	$ 1,290,940	340,783	(101,205)	1,530,518
Balance, end of period (in shares) at Sep. 30, 2023	150,706
Balance, beginning of period at Jun. 30, 2023	$ 1,291,307	325,223	(84,602)	1,531,928
Balance, beginning of period (in shares) at Jun. 30, 2023	150,810
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		15,560		15,560
Foreign currency translation adjustments			(16,603)	(16,603)
Settlement of convertible debt conversion	$ (415)			(415)
Repurchases of common stock	$ (1,939)			(1,939)
Repurchases of common stock (in shares)	(174)
Activity in company stock plans, net and other	$ 481			481
Activity in company stock plans, net and other (in shares)	70
Share-based compensation	$ 1,506			1,506
Balance, end of period at Sep. 30, 2023	$ 1,290,940	340,783	(101,205)	1,530,518
Balance, end of period (in shares) at Sep. 30, 2023	150,706
Balance, beginning of period at Dec. 31, 2023	$ 1,271,565	312,450	(83,015)	1,501,000
Balance, beginning of period (in shares) at Dec. 31, 2023	152,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		35,516		35,516
Foreign currency translation adjustments			35,272	35,272
Settlement of convertible debt conversion	$ (84)			(84)
Repurchases of common stock	$ (10,218)			(10,218)
Repurchases of common stock (in shares)	(938)
Termination of capped calls	$ 4,381			4,381
Activity in company stock plans, net and other	$ (401)			(401)
Activity in company stock plans, net and other (in shares)	748
Share-based compensation	$ 5,104			5,104
Balance, end of period at Sep. 30, 2024	$ 1,270,347	347,966	(47,743)	1,570,570
Balance, end of period (in shares) at Sep. 30, 2024	152,101
Balance, beginning of period at Jun. 30, 2024	$ 1,267,768	318,452	(89,432)	1,496,788
Balance, beginning of period (in shares) at Jun. 30, 2024	152,051
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		29,514		29,514
Foreign currency translation adjustments			41,689	41,689
Activity in company stock plans, net and other	$ 901			901
Activity in company stock plans, net and other (in shares)	50
Share-based compensation	$ 1,678			1,678
Balance, end of period at Sep. 30, 2024	$ 1,270,347	$ 347,966	$ (47,743)	$ 1,570,570
Balance, end of period (in shares) at Sep. 30, 2024	152,101

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 35,516	$ 17,495
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	132,728	120,013
Amortization of debt discount	161
Amortization of debt issuance costs	1,611	1,840
Share-based compensation	5,524	4,765
Deferred income taxes	13,167	6,940
(Gain) loss on disposition of assets, net	50	(367)
Losses related to convertible senior notes	20,922
Unrealized foreign currency loss	(1,213)	11,587
Change in fair value of contingent consideration		31,319
Changes in operating assets and liabilities:
Accounts receivable, net	12,741	(96,027)
Other current assets	(13,778)	(16,774)
Income tax payable	(509)	(2,518)
Accounts payable and accrued liabilities	(73,169)	31,142
Deferred recertification and dry dock costs, net	(29,239)	(59,216)
Other, net	3,539	7,521
Net cash provided by operating activities	108,051	57,720
Cash flows from investing activities:
Capital expenditures	(10,780)	(16,165)
Proceeds from sale of assets	100	365
Proceeds from insurance recoveries	363
Net cash used in investing activities	(10,317)	(15,800)
Cash flows from financing activities:
Payments related to convertible senior notes	(60,720)	(30,415)
Repayment of MARAD Debt	(8,749)	(8,333)
Proceeds from settlement of capped calls	4,381
Debt issuance costs	(1,453)	(236)
Repurchases of common stock	(10,189)	(11,988)
Payments related to tax withholding for share-based compensation	(4,003)	(1,385)
Proceeds from issuance of ESPP shares	1,859	982
Payment of earn-out consideration	(26,700)
Net cash used in financing activities	(105,574)	(51,375)
Effect of exchange rate changes on cash and cash equivalents	(231)	(11,286)
Net decrease in cash and cash equivalents	(8,071)	(20,741)
Cash and cash equivalents:
Balance, beginning of year	332,191	189,111
Balance, end of period	$ 324,120	$ 168,370

Basis Of Presentation And New A

Basis Of Presentation And New Accounting Standards	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation And New Accounting Standards	Note 1 — Basis of Presentation and New Accounting Standards The accompanying condensed consolidated financial statements include the accounts of Helix Energy Solutions Group, Inc. and its subsidiaries (collectively, “Helix”). Unless the context indicates otherwise, the terms “we,” “us” and “our” in this report refer collectively to Helix and its subsidiaries. All material intercompany accounts and transactions have been eliminated. These unaudited condensed consolidated financial statements in U.S. dollars have been prepared in accordance with instructions for the Quarterly Report on Form 10-Q required to be filed with the Securities and Exchange Commission (the “SEC”) and do not include all information and footnotes normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the amounts reported in the financial statements and the related disclosures. Actual results may differ from our estimates. We have made all adjustments, which, unless otherwise disclosed, are of normal recurring nature, that we believe are necessary for a fair presentation of the condensed consolidated balance sheets, statements of operations, statements of comprehensive loss, statements of shareholders’ equity and statements of cash flows, as applicable. The operating results for the three- and nine-month periods ended September 30, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. Our balance sheet as of December 31, 2023 included herein has been derived from the audited balance sheet as of December 31, 2023 included in our 2023 Annual Report on Form 10-K (our “2023 Form 10-K”). These unaudited condensed consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements and notes thereto included in our 2023 Form 10-K. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current presentation format. New accounting standards In November 2023, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures,” which requires entities to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (the “CODM”) and included within each reported measure of segment profit or loss as well as an amount for other segment items by reportable segment and a description of its composition. ASU No. 2023-07 requires all annual disclosures about a reportable segment’s profit or loss and assets to be provided in interim periods as well. Among other things, this ASU also requires that a public entity disclose the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. ASU No. 2023-07 will be effective on a retrospective basis for annual periods beginning January 1, 2024 and for interim periods beginning January 1, 2025. This ASU is not expected to have a material impact on our consolidated financial statements other than increased disclosure requirements. In December 2023, the FASB issued ASU No. 2023-09, “Improvements to Income Tax Disclosures,” which requires entities to disclose, on an annual basis, specific categories in a tabular rate reconciliation using both percentages and reporting currency amounts and to provide additional information for reconciling items that meet a quantitative threshold. This ASU also requires that entities disclose on an annual basis: a) income taxes paid (net) disaggregated by federal, state and foreign taxes, b) income taxes paid (net) by individual jurisdiction, c) income (or loss) from continuing operations before income tax expense (or benefit) between domestic and foreign, and d) income tax expense (or benefit) from continuing operations by federal, state and foreign. Certain previous disclosure requirements on unrecognized tax benefits and cumulative amount of temporary differences are eliminated. ASU No. 2023-09 will be effective for us for annual periods beginning January 1, 2025. This ASU is not expected to have a material impact on our consolidated financial statements other than increased disclosure requirements. We do not expect other recently issued accounting standards to have a material impact on our financial position, results of operations or cash flows when they become effective.

Company Overview

Company Overview	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company Overview	Note 2 — Company Overview We are an international offshore energy services company that provides specialty services to the offshore energy industry, with a focus on well intervention, robotics and decommissioning operations. Our services are key in supporting a global energy transition: ● Production maximization — our assets and methodologies are specifically designed to efficiently enhance and extend the lives of existing oil and gas reserves; we also offer an alternative to take over end-of-life reserves in preparation for their abandonment; ● Decommissioning — we are a full-field abandonment contractor and believe that regulatory push for plug and abandonment (“P&A”) and transition to renewable energy will facilitate the continued growth of the abandonment market; and ● Renewables — we are an established global leader in jet trenching and provide specialty support services to renewable energy developments such as offshore wind farms, including boulder removal and unexploded ordnance clearance. We provide a range of services to the oil and gas and renewable energy markets primarily in the Gulf of Mexico (deepwater and shelf), U.S. East Coast, Brazil, North Sea, Asia Pacific and West Africa regions. Our North Sea operations and our Gulf of Mexico shelf operations are usually subject to seasonal changes in demand, which generally peaks in the summer months and declines in the winter months. Our services are segregated into four reportable business segments: Well Intervention, Robotics, Shallow Water Abandonment and Production Facilities. Our Well Intervention segment provides services enabling our customers to safely access subsea offshore wells for the purpose of performing production enhancement or decommissioning operations, thereby mitigating the need to drill new wells by extending the useful lives of existing wells and preserving the environment by preventing uncontrolled releases of oil and natural gas. Our well intervention vessels include the Q4000 Q5000 Q7000 Seawell Well Enhancer Siem H 1 Siem Helix 2 Our Robotics segment provides trenching, seabed clearance, offshore construction and inspection, repair and maintenance (“IRM”) services to both the oil and gas and the renewable energy markets globally, thereby assisting the delivery of renewable energy and supporting the responsible transition away from a carbon-based economy. Additionally, our robotics services are used in and complement our well intervention services. Our Robotics segment includes remotely operated vehicles (“ROVs”), trenchers, IROV boulder grabs and robotics support vessels under term charters as well as spot vessels as needed. We offer our ROVs, trenchers and IROV boulder grabs on a stand-alone basis or on an integrated basis with chartered robotics support vessels. Our Shallow Water Abandonment segment provides services in support of the upstream and midstream ‎industries predominantly in the Gulf of Mexico shelf, including offshore oilfield decommissioning and ‎reclamation, project management, engineered solutions, intervention, maintenance, repair, heavy lift and commercial diving services. Our Shallow Water Abandonment segment includes Helix Alliance that was acquired in July 2022, which offers a diversified fleet of marine assets including liftboats, offshore supply vessels (“OSVs”), dive support vessels (“DSVs”), a heavy lift derrick barge, a crew boat, P&A systems and coiled tubing (“CT”) systems. Our Production Facilities segment includes the Helix Producer I HP I HP I Q4000 Q5000

Details Of Certain Accounts

Details Of Certain Accounts	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Details Of Certain Accounts	Note 3 — Details of Certain Accounts Other current assets consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Prepaids ​ $ 33,511 $ 28,352 Contract assets (Note 8) ​ ​ 12,888 ​ ​ 5,824 Deferred costs (Note 8) ​ 42,048 ​ 36,041 Other ​ 10,487 ​ 15,006 Total other current assets ​ $ 98,934 $ 85,223 ​ Other assets, net consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Prepaid charter (1) ​ $ 12,544 $ 12,544 Deferred costs (Note 8) ​ ​ 709 ​ 587 Other receivable (2) ​ 24,247 ​ 25,623 Intangible assets with finite lives, net ​ 3,840 ​ 4,105 Other ​ 1,978 ​ 1,964 Total other assets, net ​ $ 43,318 $ 44,823 (1) Represents prepayments to the owner of the Siem Helix 1 and the Siem Helix 2 to offset certain payment obligations associated with the vessels at the end of their respective charter term. (2) Represents the present value of the agreed-upon amounts that we are entitled to receive from Marathon Oil Corporation (“Marathon Oil”) for remaining P&A work to be performed by us on Droshky oil and gas properties we acquired from Marathon Oil in 2019. ​ Accrued liabilities consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Accrued payroll and related benefits ​ $ 48,161 $ 59,010 Accrued interest ​ ​ 2,671 ​ ​ 4,181 Income tax payable ​ 1,644 ​ 1,938 Deferred revenue (Note 8) ​ 25,581 ​ 32,763 Earn-out consideration (1) ​ — ​ 85,000 Other (2) ​ 13,710 ​ 20,220 Total accrued liabilities ​ $ 91,767 $ 203,112 (1) Represents the final amount of the earn-out consideration associated with the acquisition of the Alliance group of companies (collectively “Alliance”) on July 1, 2022, which was paid to the seller of Alliance in cash on April 3, 2024. (2) Amounts as of December 31, 2023 included $9.0 million of credits towards future services that we granted for the purchase of five P&A systems and other assets . These credits were increased by $2.4 million with a charge to “Other expense, net” during the third quarter 2024 and were fully utilized as of September 30, 2024. ​ Other non-current liabilities consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Asset retirement obligations (Note 12) ​ $ 61,570 $ 61,356 Other (1) ​ 3,188 ​ 4,892 Total other non-current liabilities ​ $ 64,758 $ 66,248 (1) Amount as of December 31, 2023 included $2.6 million of credits offered by us in exchange for the purchase of P&A equipment, which were fully utilized as of September 30, 2024 (see above).

Leases

Leases	9 Months Ended
	Sep. 30, 2024
Leases [Abstract]
Leases	Note 4 — Leases We charter vessels and lease facilities and equipment under non-cancelable contracts that expire on various dates through 2034. The following table details the components of our lease cost (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Operating lease cost ​ $ 22,643 ​ $ 18,836 ​ $ 65,475 $ 53,189 Variable lease cost ​ 2,236 ​ 6,058 ​ 8,353 ​ 16,223 Short-term lease cost ​ 18,665 ​ 18,751 ​ 41,324 ​ 43,644 Sublease income ​ (26) ​ (374) ​ (70) ​ (911) Net lease cost ​ $ 43,518 ​ $ 43,271 ​ $ 115,082 $ 112,145 ​ Maturities of our operating lease liabilities as of September 30, 2024 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Facilities and ​ ​ ​ Vessels Equipment Total Less than one year ​ $ 78,073 ​ $ 6,567 $ 84,640 One to two years ​ 69,963 ​ 3,436 ​ 73,399 Two to three years ​ 61,771 ​ 2,653 ​ 64,424 Three to four years ​ 58,208 ​ 2,597 ​ 60,805 Four to five years ​ 52,748 ​ 2,381 ​ 55,129 Over five years ​ 99,552 ​ 7,577 ​ 107,129 Total lease payments ​ $ 420,315 ​ $ 25,211 $ 445,526 Less: imputed interest ​ (87,109) ​ (5,158) ​ (92,267) Total operating lease liabilities ​ $ 333,206 ​ $ 20,053 $ 353,259 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current operating lease liabilities ​ $ 54,098 ​ $ 5,768 $ 59,866 Non-current operating lease liabilities ​ 279,108 ​ 14,285 ​ 293,393 Total operating lease liabilities ​ $ 333,206 ​ $ 20,053 $ 353,259 ​ Maturities of our operating lease liabilities as of December 31, 2023 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Facilities and ​ ​ ​ Vessels Equipment Total Less than one year ​ $ 67,488 ​ $ 6,639 $ 74,127 One to two years ​ 55,453 ​ 3,508 ​ 58,961 Two to three years ​ 35,200 ​ 1,289 ​ 36,489 Three to four years ​ 26,245 ​ 1,272 ​ 27,517 Four to five years ​ 3,040 ​ 1,244 ​ 4,284 Over five years ​ — ​ 1,926 ​ 1,926 Total lease payments ​ $ 187,426 ​ $ 15,878 $ 203,304 Less: imputed interest ​ (22,419) ​ (2,038) ​ (24,457) Total operating lease liabilities ​ $ 165,007 ​ $ 13,840 $ 178,847 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current operating lease liabilities ​ $ 56,602 ​ $ 6,060 $ 62,662 Non-current operating lease liabilities ​ 108,405 ​ 7,780 ​ 116,185 Total operating lease liabilities ​ $ 165,007 ​ $ 13,840 $ 178,847 ​ The following table presents the weighted average remaining lease term and discount rate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 ​ 2023 Weighted average remaining lease term 6.0 years ​ 3.1 years Weighted average discount rate 7.89 % ​ 8.20 % ​ The following table presents other information related to our operating leases (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ ​ September 30, ​ 2024 2023 Cash paid for operating lease liabilities ​ $ 60,042 $ 51,733 Right-of-use assets obtained in exchange for new operating lease liabilities (1) ​ 213,480 ​ 25,463 (1) Our operating lease additions during the nine-month period ended September 30, 2024 are primarily related to the charter extensions for the Siem Helix 1 , the Siem Helix 2 , the Grand Canyon II and the Shelia Bordelon (Note 13). Our operating lease additions during the nine-month period ended September 30, 2023 are primarily related to the vessel charter for the Glomar Wave .

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Long-term Debt	Note 5 — Long-Term Debt Scheduled maturities of our long-term debt outstanding as of September 30, 2024 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ MARAD ​ 2029 ​ ​ ​ ​ Debt Notes Total Less than one year ​ $ 9,186 ​ $ — $ 9,186 One to two years ​ 9,644 ​ — ​ 9,644 Two to three years ​ 5,001 ​ — ​ 5,001 Three to four years ​ — ​ — ​ — Four to five years ​ — ​ 300,000 ​ 300,000 Gross debt ​ 23,831 ​ 300,000 ​ 323,831 Unamortized debt discount (1) ​ ​ — ​ ​ (1,243) ​ ​ (1,243) Unamortized debt issuance costs (1) ​ (1,220) ​ (6,695) ​ (7,915) Total debt ​ 22,611 ​ 292,062 ​ 314,673 Less current maturities ​ (9,186) ​ — ​ (9,186) Long-term debt ​ $ 13,425 ​ $ 292,062 $ 305,487 (1) Debt discount and debt issuance costs are amortized to interest expense over the term of the applicable debt agreement. ​ Below is a summary of our indebtedness: Credit Agreement On September 30, 2021 we entered into an asset-based credit agreement with Bank of America, N.A. (“Bank of America”), Wells Fargo Bank, N.A. and Zions Bancorporation and subsequently we entered into various amendments (collectively, the “Amended ABL Facility”). The most recent amendment on August 2, 2024 extended the maturity of the Amended ABL Facility and increased the letter of credit basket size. The Amended ABL Facility provides a $120 million asset-based revolving credit facility, which matures on August 2, 2029, with a springing maturity 91 days prior to the maturity of any outstanding indebtedness with a principal amount in excess of $50 million. The Amended ABL Facility also permits us to request an increase of the facility by up to $30 million, subject to certain conditions. Commitments under the Amended ABL Facility are comprised of separate U.S. and U.K. revolving credit facility commitments of $85 million and $35 million, respectively. The Amended ABL Facility provides funding based on a borrowing base calculation that includes eligible U.S. and U.K. customer accounts receivable and cash, and provides for a $55 million sub-limit for the issuance of letters of credit. As of September 30, 2024, we had no borrowings under the Amended ABL Facility, and our available borrowing capacity, based on the borrowing base, totaled $74.7 million, net of $31.6 million of letters of credit issued. We and certain of our U.S. and U.K. subsidiaries are the current borrowers under the Amended ABL Facility, whose obligations under the Amended ABL Facility are guaranteed by those borrowers and certain other U.S. and U.K. subsidiaries, excluding Cal Dive I – Title XI, Inc. (“CDI Title XI”), Helix Offshore Services Limited and certain other enumerated subsidiaries. Other subsidiaries may be added as guarantors of the facility in the future. The Amended ABL Facility is secured by all accounts receivable and designated deposit accounts of the U.S. borrowers and guarantors, and by substantially all of the assets of the U.K. borrowers and guarantors. U.S. borrowings under the Amended ABL Facility bear interest at the Term SOFR rate (also known as CME Term SOFR as administered by CME Group, Inc.) plus a margin of 1.50% to 2.00% or at a base rate plus a margin of 0.50% to 1.00%. U.K. borrowings under the Amended ABL Facility denominated in U.S. dollars bear interest at the Term SOFR rate The Amended ABL Facility includes certain limitations on our ability to incur additional indebtedness, grant liens on assets, pay dividends and make distributions on equity interests, dispose of assets, make investments, repay certain indebtedness, engage in mergers, and other matters, in each case subject to certain exceptions. The Amended ABL Facility contains customary default provisions which, if triggered, could result in acceleration of all amounts then outstanding. The Amended ABL Facility requires us to satisfy and maintain a fixed charge coverage ratio of not less than 1.0 to 1.0 if availability is less than the greater of 10% of the borrowing base or $12 million. The Amended ABL Facility also (i) limits the amount of permitted debt for the deferred purchase price of property not to exceed $50 million, and (ii) provides for potential ESG-related pricing adjustments based on specific metrics and performance targets determined by us and Bank of America, as agent with respect to the Amended ABL Facility. MARAD Debt In 2005, Helix’s subsidiary CDI – Title XI issued its U.S. Government Guaranteed Ship Financing Bonds, Q4000 Series, to refinance the construction financing originally granted in 2002 of the Q4000 Q4000 Q4000 Q4000 Senior Notes Due 2029 (“2029 Notes”) On December 1, 2023, we issued $300 million aggregate principal amount of the 2029 Notes. The net proceeds from the issuance of the 2029 Notes were approximately $291.1 million, after deducting the purchasers’ discount and debt issuance costs. We used cash proceeds from the offering to retire the Convertible Senior Notes due 2026 (the “2026 Notes”). See details regarding the 2026 Notes below. The 2029 Notes bear interest at a coupon interest rate of 9.75% per annum payable semi-annually in arrears on March 1 and September 1 of each year, beginning on March 1, 2024. The 2029 Notes mature on March 1, 2029 unless earlier redeemed or repurchased by us. Prior to March 1, 2026, we may, at our option, redeem the 2029 Notes, in whole or in part, at a price equal to 100% of the aggregate principal amount of the notes to be redeemed, plus a make-whole premium and accrued and unpaid interest, if any, to, but excluding, the redemption date. On or after March 1, 2026, we may, at our option, redeem the 2029 Notes, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the notes to be redeemed) set forth below, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. Prior to March 1, 2026, following certain equity offerings we may, at our option, on any one or more occasions, redeem up to 40% of the 2029 Notes at a price equal to 109.750% of the aggregate principal amount of the notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, in an amount not exceeding the proceeds of such equity offerings. ​ ​ ​ ​ ​ ​ Redemption Year Price 2026 ​ 104.875% 2027 ​ 102.438% 2028 and thereafter ​ 100.000% ​ Upon the occurrence of a Change of Control Triggering Event, as defined in the indenture governing the 2029 Notes, we may be required to make an offer to repurchase all of the notes then outstanding at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but not including, the repurchase date. The indenture governing the 2029 Notes contains customary terms and covenants, including limitations on additional indebtedness, restricted payments, liens, asset sales, transactions with affiliates, mergers and consolidations, designation of unrestricted subsidiaries, and dividend and other restrictions affecting restricted subsidiaries. The 2029 Notes are guaranteed on a senior unsecured basis by the subsidiaries that guarantee the Amended ABL Facility, as well as certain future subsidiaries that may guarantee certain of our indebtedness, including the Amended ABL Facility. The 2029 Notes are junior in right of payment to all our existing and future secured indebtedness and obligations and rank equally in right of payment with all our existing and future senior unsecured indebtedness. The 2029 Notes rank senior in right of payment to any of our future subordinated indebtedness and are fully and unconditionally guaranteed by the guarantors described above on a senior basis. 2026 Notes During December 2023 and the first quarter 2024, we retired the 2026 Notes through various transactions using proceeds from the 2029 Notes as well as the issuance of our common stock. In December 2023, we entered into privately negotiated agreements with certain holders of the 2026 Notes to repurchase $159.8 million aggregate principal amount of the 2026 Notes (the “2026 Notes Repurchases”) for 1.5 million shares of our common stock and aggregate cash payments of $229.7 million, plus accrued and unpaid cash interest of $3.8 million. We recognized pre-tax inducement charges of $37.4 million for the 2026 Notes Repurchases in the fourth quarter 2023, representing the total settlement value in excess of the total conversion value of the 2026 Notes Repurchases when the final negotiated offers were accepted. The conversion value paid in excess of the carrying amount of the 2026 Notes Repurchases is reflected in “Common stock” in the shareholders’ equity section of the accompanying condensed consolidated balance sheets. In December 2023, $0.2 million aggregate principal amount of the 2026 Notes was tendered for conversion. We settled the conversions for $0.3 million cash in March 2024. The conversion value paid in excess of the $0.2 million carrying amount of the 2026 Notes that were tentered for conversion is reflected in “Common stock” in the shareholders’ equity section of the accompanying condensed consolidated balance sheet. In January 2024, we issued a notice for the redemption of the remaining $40.0 million aggregate principal amount of the 2026 Notes to be settled in March 2024 (the “2026 Notes Redemptions”). The redemption price consisted of the principal amount and the make-whole premium, plus accrued and unpaid interest. Our redemption notice enabled holders of $39.7 million aggregate principal amount of the 2026 Notes to tender their notes for conversion prior to the redemption date, with the remaining $0.3 million aggregate principal amount of the notes redeemed. We settled both the conversions and redemptions for an aggregate $60.2 million cash in March 2024 and recognized pre-tax losses of $20.9 million. These losses are reflected in “Losses related to convertible senior notes” in the accompanying condensed consolidated statement of operations. The 2026 Notes had a coupon interest rate of 6.75% per annum and an effective interest rate of 7.6%. For the nine-month period ended September 30, 2024, total interest expense related to the 2026 Notes was $0.4 million with coupon interest expense of $0.3 million and the amortization of debt issuance costs of $0.1 million. For the three- and nine-month periods ended September 30, 2023, total interest expense related to the 2026 Notes was $3.7 million and $11.1 million, respectively, with coupon interest expense of $3.4 million and $10.1 million, respectively, and the amortization of debt issuance costs of $0.3 million and $1.0 million, respectively. 2026 Capped Calls In connection with the 2026 Notes offering, we had entered into capped call transactions (the “2026 Capped Calls”) with three separate counterparties to hedge the dilution risk of the 2026 Notes. Concurrently with the 2026 Notes Repurchases in December 2023, we terminated a proportionate amount of the 2026 Capped Calls and received $15.6 million in cash, recognizing an increase to “Common stock” of $14.2 million and a $1.4 million gain. Concurrent with the settlement of the 2026 Notes Redemptions in March 2024, we terminated the remaining 2026 Capped Calls and received $4.4 million in cash, recognizing an increase to “Common stock” in the shareholders’ equity section of the accompanying condensed consolidated balance sheet. Other In accordance with the Amended ABL Facility, the MARAD Debt and the 2029 Notes, we are required to comply with certain covenants, including minimum liquidity and a springing fixed charge coverage ratio (applicable under certain conditions that are currently not applicable) with respect to the Amended ABL Facility and the maintenance of net worth, working capital and debt-to-equity requirements with respect to the MARAD Debt. As of September 30, 2024, we were in compliance with these covenants. The Convertible Senior Notes due 2023 (the “2023 Notes”) matured on September 15, 2023. Upon maturity of the 2023 Notes, we paid $29.6 million in cash to settle the conversion of $29.2 million aggregate principal amount of the notes, plus accrued and unpaid interest. We recorded the conversion value in excess of such principal amount converted to “Common stock” in the accompanying condensed consolidated balance sheets. Notes representing the remaining $0.8 million aggregate principal amount of the 2023 Notes were redeemed at par, plus accrued and unpaid interest. The 2023 Notes had a coupon interest rate of 4.125% per annum and an effective interest rate of 4.8%. For the three- and nine-month periods ended September 30, 2023, total interest expense related to the 2023 Notes was $0.3 million and $1.0 million, respectively, primarily from coupon interest expense. The following table details the components of our net interest expense (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Interest expense ​ $ 8,414 ​ $ 4,830 ​ $ 25,594 $ 14,556 Interest income ​ (2,725) ​ (678) ​ (8,537) ​ (1,989) Net interest expense ​ $ 5,689 ​ $ 4,152 ​ $ 17,057 $ 12,567 ​

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Note 6 — Income Taxes We operate in multiple jurisdictions with complex tax laws subject to interpretation and judgment. We believe that our application of such laws and the tax impact thereof are reasonable and fairly presented in our condensed consolidated financial statements. For the three- and nine-month periods ended September 30, 2024, we recognized income tax provision of $9.5 million and $22.5 million, respectively, resulting in effective tax rates of 24.4% and 38.8%, respectively. The effective tax rate for the three-month period ended September 30, 2024 was higher than the U.S. statutory rate primarily due to the jurisdicational mix of earnings, certain non-deductible expenses and non-creditable foreign income taxes. The effective rate for the nine-month period ended September 30, 2024 was higher than the U.S. statutory rate primarily due to the non-deductibility of certain losses associated with the 2026 Notes Redemptions, which was characterized as a discrete event and reported in the first quarter. For the three- and nine-month periods ended September 30, 2023, we recognized income tax expense of $8.3 million and $9.6 million, respectively, resulting in effective tax rates of 34.9% and 35.5%, respectively. The effective tax rates for these periods were higher than the U.S. statutory rate primarily due to certain non-deductible expenses and non-creditable foreign income taxes.

Share Repurchase Programs

Share Repurchase Programs	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Share Repurchase Programs	Note 7 — Share Repurchase Programs In February 2023, our Board of Directors (our “Board”) authorized a share repurchase program to repurchase issued and outstanding shares of our common stock up to $200 million (the “2023 Repurchase Program”). During the nine-month period ended September 30, 2024, we repurchased a total of 937,585 shares of our common stock pursuant to the 2023 Repurchase Program for approximately $10.2 million or an average of $10.87 per share. The 2023 Repurchase Program has no set expiration date. Repurchases under the 2023 Repurchase Program have been made through open market purchases in compliance with Rule 10b-18 under the Exchange Act, but may also be made through privately negotiated transactions or plans, instructions or contracts established under Rule 10b5-1 under the Exchange Act. The manner, timing and amount of any purchase will be determined by management at its discretion based on an evaluation of market conditions, stock price, liquidity and other factors. The 2023 Repurchase Program does not obligate us to acquire any particular amount of common stock and may be modified or superseded at any time at our discretion. Any repurchased shares are cancelled.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	Note 8 — Revenue from Contracts with Customers Disaggregation of Revenue Our service contracts generally contain provisions for specific time, material and equipment charges that are billed in accordance with the terms of such contracts (dayrate contracts) but we occasionally contract on a lump sum basis (lump sum contracts). We record revenues net of taxes collected from customers and remitted to governmental authorities. Our revenues are primarily derived from short-term and long-term service contracts with customers. Contracts are classified as long-term if all or part of the contract is to be performed over a period extending beyond 12 months from the effective date of the contract. Long-term contracts may include multi-year agreements whereby the commitment for services in any one year may be short in duration. The following table provides information about disaggregated revenue by contract duration (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Well ​ ​ ​ Shallow Water ​ Production ​ Intercompany ​ Total ​ Intervention Robotics Abandonment Facilities Eliminations Revenue Three months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 130,150 ​ $ 48,906 ​ $ 53,410 ​ $ — ​ $ (38) ​ $ 232,428 Long-term ​ 52,517 ​ 35,620 ​ 18,185 ​ 20,695 ​ (17,026) ​ 109,991 Total ​ $ 182,667 ​ $ 84,526 ​ $ 71,595 ​ $ 20,695 ​ $ (17,064) ​ $ 342,419 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 139,743 ​ $ 26,995 ​ $ 73,037 ​ $ — ​ $ — ​ $ 239,775 Long-term ​ 85,624 ​ 48,651 ​ 14,235 ​ 24,469 ​ (17,084) ​ 155,895 Total ​ $ 225,367 ​ $ 75,646 ​ $ 87,272 ​ $ 24,469 ​ $ (17,084) ​ $ 395,670 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 417,716 ​ $ 118,275 ​ $ 121,142 ​ $ — ​ $ (6,471) ​ $ 650,662 Long-term ​ 206,089 ​ 97,809 ​ 28,147 ​ 70,247 ​ (49,527) ​ 352,765 Total ​ $ 623,805 ​ $ 216,084 ​ $ 149,289 ​ $ 70,247 ​ $ (55,998) ​ $ 1,003,427 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 293,131 ​ $ 100,269 ​ $ 196,534 ​ $ — ​ $ (26) ​ $ 589,908 Long-term ​ 228,895 ​ 94,649 ​ 16,425 ​ 68,502 ​ (43,808) ​ 364,663 Total ​ $ 522,026 ​ $ 194,918 ​ $ 212,959 ​ $ 68,502 ​ $ (43,834) ​ $ 954,571 ​ We provide services to our customers in the following markets that are key to our energy transition strategy: Production maximization, Decommissioning and Renewables. The following table provides information about disaggregated revenue by market strategy (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Well ​ ​ ​ Shallow Water ​ Production ​ Intercompany ​ Total ​ Intervention Robotics Abandonment Facilities Eliminations Revenue Three months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 95,848 ​ $ 34,541 ​ $ 483 ​ $ 20,695 ​ $ (9,791) ​ $ 141,776 Decommissioning ​ 82,860 ​ 2,746 ​ 71,112 ​ — ​ (3,469) ​ 153,249 Renewables ​ 3,126 ​ 42,804 ​ — ​ — ​ (3,126) ​ 42,804 Other ​ 833 ​ 4,435 ​ — ​ — ​ (678) ​ 4,590 Total ​ $ 182,667 ​ $ 84,526 ​ $ 71,595 ​ $ 20,695 ​ $ (17,064) ​ $ 342,419 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 39,749 ​ $ 25,192 ​ $ 713 ​ $ 24,469 ​ $ (4,079) ​ $ 86,044 Decommissioning ​ 161,977 ​ 16,223 ​ 86,559 ​ — ​ (7,805) ​ 256,954 Renewables ​ 3,332 ​ 32,167 ​ — ​ — ​ (3,332) ​ 32,167 Other ​ 20,309 ​ 2,064 ​ — ​ — ​ (1,868) ​ 20,505 Total ​ $ 225,367 ​ $ 75,646 ​ $ 87,272 ​ $ 24,469 ​ $ (17,084) ​ $ 395,670 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 275,599 ​ $ 73,573 ​ $ 6,734 ​ $ 70,247 ​ $ (29,002) ​ $ 397,151 Decommissioning ​ 335,185 ​ 15,257 ​ 142,555 ​ — ​ (14,038) ​ 478,959 Renewables ​ 9,899 ​ 117,469 ​ — ​ — ​ (9,899) ​ 117,469 Other ​ 3,122 ​ 9,785 ​ — ​ — ​ (3,059) ​ 9,848 Total ​ $ 623,805 ​ $ 216,084 ​ $ 149,289 ​ $ 70,247 ​ $ (55,998) ​ $ 1,003,427 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 139,898 ​ $ 73,220 ​ $ 7,682 ​ $ 68,502 ​ $ (12,504) ​ $ 276,798 Decommissioning ​ 350,773 ​ 39,144 ​ 205,277 ​ — ​ (17,819) ​ 577,375 Renewables ​ 8,042 ​ 76,730 ​ — ​ — ​ (8,042) ​ 76,730 Other ​ 23,313 ​ 5,824 ​ — ​ — ​ (5,469) ​ 23,668 Total ​ $ 522,026 ​ $ 194,918 ​ $ 212,959 ​ $ 68,502 ​ $ (43,834) ​ $ 954,571 ​ Contract Balances Contract assets are rights to consideration in exchange for services that we have provided to a customer when those rights are conditioned on our future performance. Contract assets generally consist of (i) demobilization fees recognized ratably over the contract term but invoiced upon completion of the demobilization activities and (ii) revenue recognized in excess of the amount billed to the customer for lump sum contracts when the cost-to-cost method of revenue recognition is utilized. Contract liabilities are obligations to provide future services to a customer for which we have already received, or have the unconditional right to receive, the consideration for those services from the customer. Contract liabilities may consist of (i) advance payments received from customers, including upfront mobilization fees allocated to a single performance obligation and recognized ratably over the contract term and/or (ii) amounts billed to the customer in excess of revenue recognized for lump sum contracts when the cost-to-cost method of revenue recognition is utilized. We report the net contract asset or contract liability position on a contract-by-contract basis at the end of each reporting period. Net contract assets were $12.9 million as of September 30, 2024 and $5.8 million as of December 31, 2023 and are reflected in “Other current assets” in the accompanying condensed consolidated balance sheets (Note 3). We had no credit losses on our contract assets for the three- and nine-month periods ended September 30, 2024 and 2023. Net contract liabilities totaled $25.6 million as of September 30, 2024 and $32.8 million as of December 31, 2023 and are reflected as “Deferred revenue,” a component of “Accrued liabilities” in the accompanying condensed consolidated balance sheets (Note 3). Revenue recognized for the three- and nine-month periods ended September 30, 2024 included $12.6 million and $34.4 million, respectively, that were included in the contract liability balance at the beginning of each period. Revenue recognized for the three- and nine-month periods ended September 30, 2023 included $15.2 million and $8.4 million, respectively, that were included in the contract liability balance at the beginning of each period. Performance Obligations As of September 30, 2024, $1.6 billion related to unsatisfied performance obligations was expected to be recognized as revenue in the future, with $260.6 million, $637.2 million and $712.9 million in 2024 2025 2026 For the three- and nine-month periods ended September 30, 2024 and 2023, revenues recognized from performance obligations satisfied (or partially satisfied) in previous periods were immaterial. Contract Fulfillment Costs Contract fulfillment costs consist of costs incurred in fulfilling a contract with a customer. Our contract fulfillment costs primarily relate to costs incurred for mobilization of personnel and equipment at the beginning of a contract and costs incurred for demobilization at the end of a contract. Mobilization costs are deferred and amortized ratably over the contract term (including anticipated contract extensions) based on the pattern of the provision of services to which the contract fulfillment costs relate. Demobilization costs are recognized when incurred at the end of the contract. Deferred contract costs are reflected as “Deferred costs,” a component of “Other current assets” and “Other assets, net” in the accompanying condensed consolidated balance sheets (Note 3). Our deferred contract costs totaled $42.8 million as of September 30, 2024 and $36.6 million as of December 31, 2023. For the three- and nine-month periods ended September 30, 2024, we recorded $9.9 million and $41.1 million, respectively, related to amortization of these deferred contract costs. For the three- and nine-month periods ended September 30, 2023, we recorded $13.7 million and $32.8 million, respectively, related to amortization of these deferred contract costs. There were no associated impairment losses for any period presented. For additional information regarding revenue recognition, see Notes 2 and 11 to our 2023 Form 10-K.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Note 9 — Earnings Per Share We have shares of restricted stock issued and outstanding that are currently unvested. Because holders of shares of unvested restricted stock are entitled to the same liquidation and dividend rights as the holders of our unrestricted common stock, we are required to compute earnings per share (“EPS”) under the two-class method in periods in which we have earnings. Under the two-class method, net income for each period is allocated based on the participation rights of both common shareholders and the holders of any participating securities as if earnings for the respective periods had been distributed. For periods in which we have a net loss we do not use the two-class method as holders of our restricted shares are not obligated to share in such losses. Basic EPS is computed by dividing net income allocated to common shareholders or net loss by the weighted average shares of our common stock outstanding. Diluted EPS is computed in a similar manner after considering the potential dilutive effect of share-based awards and convertible senior notes and taking the more dilutive of the two-class method and the treasury stock method or if-converted method, as applicable. The dilutive effect of share-based awards is computed using the treasury stock method, as applicable, which includes the incremental shares that would be hypothetically vested in excess of the number of shares assumed to be hypothetically repurchased with the assumed proceeds. The effect of convertible senior notes is computed for the periods in which they are outstanding using the if-converted method, if dilutive, which assumes conversion of the convertible senior notes into shares of our common stock at the beginning of the period, giving income recognition for the add-back of related interest expense (net of tax). The computations of the numerator (earnings or loss) and denominator (shares) to derive the basic and diluted EPS amounts presented on the face of the accompanying condensed consolidated statements of operations are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Three Months Ended ​ ​ September 30, 2024 ​ September 30, 2023 ​ Income Shares Income Shares Basic: ​ ​ Net income ​ $ 29,514 ​ ​ $ 15,560 Less: Undistributed earnings allocated to participating securities ​ (29) ​ ​ ​ (27) Net income available to common shareholders, basic ​ $ 29,485 ​ 151,914 ​ $ 15,533 150,550 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted: ​ ​ ​ Net income available to common shareholders, basic ​ $ 29,485 ​ 151,914 ​ $ 15,533 150,550 Effect of dilutive securities: ​ ​ ​ Share-based awards other than participating securities ​ — ​ 2,937 ​ — 3,072 Undistributed earnings reallocated to participating securities ​ 1 ​ — ​ 1 — Net income available to common shareholders, diluted ​ $ 29,486 ​ 154,851 ​ $ 15,534 ​ 153,622 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, basic and diluted ​ $ 0.19 ​ ​ ​ $ 0.10 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ Nine Months Ended ​ ​ September 30, 2024 ​ September 30, 2023 ​ Income Shares Income Shares Basic: ​ ​ Net income ​ $ 35,516 ​ ​ $ 17,495 Less: Undistributed earnings allocated to participating securities ​ (36) ​ ​ ​ (30) Net income available to common shareholders, basic ​ $ 35,480 ​ 152,171 ​ $ 17,465 151,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, basic ​ $ 0.23 ​ ​ ​ $ 0.12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted: ​ ​ ​ Net income available to common shareholders, basic ​ $ 35,480 ​ 152,171 ​ $ 17,465 151,031 Effect of dilutive securities: ​ ​ ​ Share-based awards other than participating securities ​ — ​ 2,867 ​ — 2,905 Undistributed earnings reallocated to participating securities ​ 1 ​ — ​ 1 — Net income available to common shareholders, diluted ​ $ 35,481 ​ 155,038 ​ $ 17,466 153,936 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, diluted ​ $ 0.23 ​ ​ ​ $ 0.11 ​ ​ ​ The following potentially dilutive shares related to the 2023 Notes and the 2026 Notes were excluded from the diluted EPS calculation as they were anti-dilutive (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 2023 Notes — 2,652 — 2,996 2026 Notes — 28,676 1,729 28,676 ​ We have outstanding restricted stock units (“RSUs”) (Note 10) that can be settled in either cash or shares of our common stock or a combination thereof, which are not included in the computation of diluted EPS as cash settlement is assumed.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2024
Share-based Payment Arrangement [Abstract]
Employee Benefit Plans	Note 10 — Employee Benefit Plans Long-Term Incentive Plan We currently have one active long-term incentive plan: the 2005 Long-Term Incentive Plan, as amended and restated (the “2005 Incentive Plan”). On May 15, 2024, our shareholders approved an amendment to and restatement of the 2005 Incentive Plan, which, among other things, authorizes 7.0 million additional shares for issuance pursuant to our equity incentive compensation strategy. As of September 30, 2024, there were approximately 9.5 million shares of our common stock available for issuance under the 2005 Incentive Plan. During the nine-month period ended September 30, 2024, the following grants of share-based awards were made under the 2005 Incentive Plan: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Grant Date ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ Date of Grant Award Type Shares/Units Per Share/Unit Vesting Period/Vesting Date January 1, 2024 (1) RSU 375,730 ​ $ 10.28 33% per year over three years January 1, 2024 (1) PSU 351,410 ​ $ 12.30 100% on December 31, 2026 January 1, 2024 (2) Restricted stock 5,776 ​ $ 10.28 100% on January 1, 2026 April 1, 2024 (2) Restricted stock 2,595 ​ $ 10.84 100% on January 1, 2026 July 1, 2024 (2) Restricted stock 2,356 ​ $ 11.94 100% on January 1, 2026 (1) Reflects grants to our executive officers. (2) Reflects grants to certain independent members of our Board who have elected to take their quarterly fees in stock in lieu of cash. ​ Restricted stock awards are based solely on service conditions and are accounted for as equity awards. Compensation cost for restricted stock is the product of the grant date fair value of each share and the number of shares granted and is recognized over the applicable vesting period on a straight-line basis. Forfeitures are recognized as they occur. No restricted stock awards have been granted to our executive officers or other employees since 2020. For the three- and nine-month periods ended September 30, 2024, we recognized $0.1 million and $0.7 million, respectively, as share-based compensation related to restricted stock. For the three- and nine-month periods ended September 30, 2023, we recognized $0.3 million and $1.0 million, respectively, as share-based compensation related to restricted stock. Our performance share units (“PSUs”) granted beginning in January 2021 may be settled in either cash or shares of our common stock upon vesting at the discretion of the Compensation Committee of our Board and have been accounted for as equity awards. Those PSUs consist of two components: (i) 50% based on the performance of our common stock against peer group companies, which component contains a service and a market condition, and (ii) 50% based on cumulative total Free Cash Flow, which component contains a service and a performance condition. Free Cash Flow is calculated as cash flows from operating activities less capital expenditures, net of proceeds from sale of assets. Our PSUs cliff vest at the end of a three-year period with the maximum amount of the award being 200% of the original PSU awards and the minimum amount being zero. For PSUs with a service and a market condition that are accounted for as equity awards, compensation cost is measured based on the grant date estimated fair value determined using a Monte Carlo simulation model and subsequently recognized over the vesting period on a straight-line basis. For PSUs with a service and a performance condition that are accounted for as equity awards, compensation cost is initially measured based on the grant date fair value. Cumulative compensation cost is subsequently adjusted at the end of each reporting period to reflect the current estimation of achieving the performance condition. For the three- and nine-month periods ended September 30, 2024, $1.6 million and $4.4 million, respectively, were recognized as share-based compensation related to PSUs. For the three- and nine-month periods ended September 30, 2023, $1.2 million and $3.5 million, respectively, were recognized as share-based compensation related to PSUs. In the first quarter 2024, based on the performance of our common stock price as compared to our performance peer group and our cumulative total Free Cash Flow, in each case over a three-year performance period, 452,381 PSUs granted in 2021 vested at 181%, representing 818,812 shares of our common stock with a total market value of $8.4 million. Our currently outstanding RSUs may be settled in either cash or shares of our common stock upon vesting at the discretion of the Compensation Committee and have been accounted for as liability awards. Liability RSUs are measured at their estimated fair value based on the closing share price of our common stock as of each balance sheet date, and subsequent changes in the fair value of the awards are recognized in earnings for the portion of the award for which the requisite service period has elapsed. Cumulative compensation cost for vested liability RSUs equals the actual payout value upon vesting. For the three- and nine-month periods ended September 30, 2024, $1.5 million and $5.2 million, respectively, were recognized as compensation cost. For the three- and nine-month periods ended September 30, 2023, $3.2 million and $5.5 million, respectively, were recognized as compensation cost. In 2024 and 2023, we granted fixed-value cash awards of $6.1 million and $6.0 million, respectively, to select management employees under the 2005 Incentive Plan. The value of these cash awards is recognized on a straight-line basis over a vesting period of three years. For the three- and nine-month periods ended September 30, 2024, $1.4 million and $4.1 million, respectively, were recognized as compensation cost. For the three- and nine-month periods ended September 30, 2023, $1.1 million and $3.5 million, respectively, were recognized as compensation cost. Defined Contribution Plans We sponsor a defined contribution 401(k) retirement plan (the “401(k) Plan”) in the U.S. We also contribute to various other defined contribution plans globally. For the three- and nine-month periods ended September 30, 2024, we made contributions to our defined contribution plans totaling $1.3 million and $4.1 million, respectively. For the three- and nine-month periods ended September 30, 2023, we made contributions to our defined contribution plans totaling $1.0 million and $3.2 million, respectively. Employee Stock Purchase Plan (“ESPP”) As of September 30, 2024, 1.0 million shares were available for issuance under the ESPP. The ESPP currently has a purchase limit of 260 shares per employee per purchase period. For more information regarding our employee benefit plans, including the 2005 Incentive Plan, the defined contribution plans and the ESPP, see Note 13 to our 2023 Form 10-K.

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Business Segment Information	Note 11 — Business Segment Information We have four reportable business segments: Well Intervention, Robotics, Shallow Water Abandonment and Production Facilities. Our U.S., U.K. and Brazil Well Intervention operating segments are aggregated into the Well Intervention segment for financial reporting purposes. All material intercompany transactions between the segments have been eliminated. See Note 2 for more information on our business segments. We evaluate our performance based on operating income of each reportable segment. Certain financial data by reportable segment are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 ​ 2024 2023 Net revenues — ​ ​ ​ ​ ​ Well Intervention ​ $ 182,667 ​ $ 225,367 ​ $ 623,805 ​ $ 522,026 Robotics ​ 84,526 ​ 75,646 ​ 216,084 ​ 194,918 Shallow Water Abandonment ​ ​ 71,595 ​ ​ 87,272 ​ ​ 149,289 ​ ​ 212,959 Production Facilities ​ 20,695 ​ 24,469 ​ 70,247 ​ 68,502 Intercompany eliminations ​ (17,064) ​ (17,084) ​ (55,998) ​ (43,834) Total ​ $ 342,419 ​ $ 395,670 ​ $ 1,003,427 ​ $ 954,571 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income (loss) from operations — ​ ​ ​ ​ ​ Well Intervention ​ $ 16,109 ​ $ 16,120 ​ $ 64,087 ​ $ 11,357 Robotics ​ 24,158 ​ 20,665 ​ 58,008 ​ 43,226 Shallow Water Abandonment ​ ​ 8,808 ​ ​ 27,624 ​ ​ (3,901) ​ ​ 54,208 Production Facilities ​ 8,288 ​ 8,886 ​ 15,842 ​ 21,817 Segment operating income ​ 57,363 ​ 73,295 ​ 134,036 ​ 130,608 Change in fair value of contingent consideration ​ ​ — ​ ​ (16,499) ​ ​ — ​ ​ (31,319) Corporate, eliminations and other ​ (12,723) ​ (20,568) ​ (37,479) ​ (51,159) Total ​ $ 44,640 ​ $ 36,228 ​ $ 96,557 ​ $ 48,130 Net interest expense ​ ​ (5,689) ​ ​ (4,152) ​ ​ (17,057) ​ ​ (12,567) Losses related to convertible senior notes ​ ​ — ​ ​ — ​ ​ (20,922) ​ ​ — Other non-operating expense, net ​ ​ 83 ​ ​ (8,179) ​ ​ (515) ​ ​ (8,437) Income before income taxes ​ $ 39,034 ​ $ 23,897 ​ $ 58,063 ​ $ 27,126 ​ Intercompany segment amounts are derived primarily from equipment and services provided to other business segments. Intercompany segment revenues are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Well Intervention ​ $ 8,054 ​ $ 6,832 ​ $ 26,224 ​ $ 18,174 Robotics ​ 8,972 ​ 10,252 ​ 29,548 ​ 25,634 Shallow Water Abandonment ​ 38 ​ — ​ 226 ​ 26 Total ​ $ 17,064 ​ $ 17,084 ​ $ 55,998 ​ $ 43,834 ​ Segment assets are comprised of all assets attributable to each reportable segment. Corporate and other includes all assets not directly identifiable with our business segments, most notably the majority of our cash and cash equivalents. The following table reflects total assets by reportable segment (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Well Intervention ​ $ 1,926,350 ​ $ 1,790,971 Robotics ​ 216,369 ​ 177,801 Shallow Water Abandonment ​ ​ 201,143 ​ ​ 256,356 Production Facilities ​ 107,874 ​ 120,234 Corporate and other ​ 209,413 ​ 210,674 Total ​ $ 2,661,149 ​ $ 2,556,036 ​

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Note 12 — Asset Retirement Obligations Our asset retirement obligations (“AROs”) relate to mature offshore oil and gas properties (Droshky and Thunder Hawk Field) that we acquired with the intention to perform decommissioning work at the end of their life cycles. AROs are recorded initially at fair value and consist of estimated costs for subsea infrastructure decommissioning and P&A activities associated with our oil and gas properties. The estimated costs are discounted to present value using a credit-adjusted risk-free discount rate. After its initial recognition, an ARO liability is increased for the passage of time as accretion expense, which is a component of our depreciation and amortization expense. An ARO liability may also change based on revisions in estimated costs and/or timing to settle the obligations. The following table describes the changes in our AROs (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 2023 AROs at January 1, ​ $ 61,356 ​ $ 51,956 Revisions in estimates ​ (4,010) ​ — Accretion expense ​ 4,224 ​ 3,586 AROs at September 30, ​ $ 61,570 ​ $ 55,542 ​

Commitments And Contingencies A

Commitments And Contingencies And Other Matters	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies And Other Matters	Note 13 — Commitments and Contingencies and Other Matters Commitments Our Well Intervention segment has long-term charter agreements with Siem Offshore AS for the Siem Helix 1 Siem Helix 2 Grand Canyon II Grand Canyon III Shelia Bordelon North Sea Enabler Glomar Wave Grand Canyon II Grand Canyon III Shelia Bordelon North Sea Enabler three-year Glomar Wave Contingencies and Claims From time to time, we may incur losses related to our contracts for matters such as costs in excess of contract consideration or claims related to disputes with customers and any obligations thereunder. While we believe we maintain appropriate accruals for such matters, the actual cost to us may be more or less than the amounts reserved. We are involved in various legal proceedings in the normal couse of business, including claims under the General Maritime Laws of the United States and the Merchant Marine Act of 1920 (commonly referred to as the Jones Act), contract-related disputes, employee-related disputes and subsequently identified legacy issues related to Alliance. We recognize losses for lawsuits when the probability of an unfavorable outcome is probable and we can reasonably estimate the amount of the loss. For insured claims, we recognize such losses to the extent they exceed applicable insurance coverage. Although we can give no assurance about the outcome of litigation, claims or other proceedings, we do not currently believe that any loss resulting from litigation, claims or other proceedings, to the extent not otherwise covered by insurance, will have a material adverse impact on our consolidated financial statements.

Cash Flow Information

Cash Flow Information	9 Months Ended
	Sep. 30, 2024
Supplemental Cash Flow Information [Abstract]
Statement Of Cash Flow Information	Note 14 — Statement of Cash Flow Information We define cash and cash equivalents as cash and all highly liquid financial instruments with original maturities of three months or less. The following table provides supplemental cash flow information (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ ​ September 30, ​ 2024 2023 Interest paid ​ $ 25,331 ​ $ 17,027 Income taxes paid (1) ​ 10,050 ​ 5,209 (1) Exclusive of any income tax refunds. ​ Our capital additions include the acquisition of property and equipment for which payment has not been made. These non-cash capital additions were $0.4 million at September 30, 2024 and $1.1 million at December 31, 2023. Non-cash financing activities during the nine-month period ended September 30, 2024 included the non-cash settlement of the entire $14.0 million financing liabilities with certain customer receivables. We incurred these financing liabilities as a result of the purchase of P&A equipment in the third quarter 2023 (Note 3).

Allowance For Credit Losses

Allowance For Credit Losses	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Allowance For Credit Losses	Note 15 — Allowance for Credit Losses We estimate current expected credit losses on our accounts receivable at each reporting date based on our credit loss history, adjusted for current factors including global economic and business conditions, offshore energy industry and market conditions, customer mix, contract payment terms and past due accounts receivable. The following table sets forth the activity in our allowance for credit losses (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 2023 Balance at January 1, ​ $ 3,407 ​ $ 2,277 Additions (1) ​ 475 ​ 1,020 Balance at September 30, ​ $ 3,882 ​ $ 3,297 (1) Additions reflect reserves for expected credit losses during the respective periods.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 16 — Fair Value Measurements Our financial instruments include cash and cash equivalents, receivables, accounts payable and long-term debt. The carrying amount of cash and cash equivalents, trade and other current receivables as well as accounts payable approximates fair value due to the short-term nature of these instruments. The principal amount and estimated fair value of our long-term debt are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2024 ​ December 31, 2023 ​ ​ Principal ​ Fair ​ Principal ​ Fair ​ Amount (1) Value (2) Amount (1) Value (2) 2026 Notes (fully redeemed March 2024) ​ $ — ​ $ — ​ $ 40,199 ​ $ 64,117 MARAD Debt (matures February 2027) ​ ​ 23,831 ​ ​ 23,819 ​ ​ 32,580 ​ ​ 32,348 2029 Notes (mature March 2029) ​ ​ 300,000 ​ ​ 322,050 ​ ​ 300,000 ​ ​ 315,987 Total debt ​ $ 323,831 ​ $ 345,869 ​ $ 372,779 ​ $ 412,452 (1) Principal amount includes current maturities and excludes any related unamortized debt discount and debt issuance costs. See Note 5 for additional disclosures on our long-term debt. (2) The estimated fair value was determined using Level 2 fair value inputs under the market approach, which was determined using quotes in inactive markets.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 29,514	$ 15,560	$ 35,516	$ 17,495

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis Of Presentation And New_2

Basis Of Presentation And New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	The accompanying condensed consolidated financial statements include the accounts of Helix Energy Solutions Group, Inc. and its subsidiaries (collectively, “Helix”). Unless the context indicates otherwise, the terms “we,” “us” and “our” in this report refer collectively to Helix and its subsidiaries. All material intercompany accounts and transactions have been eliminated. These unaudited condensed consolidated financial statements in U.S. dollars have been prepared in accordance with instructions for the Quarterly Report on Form 10-Q required to be filed with the Securities and Exchange Commission (the “SEC”) and do not include all information and footnotes normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the amounts reported in the financial statements and the related disclosures. Actual results may differ from our estimates. We have made all adjustments, which, unless otherwise disclosed, are of normal recurring nature, that we believe are necessary for a fair presentation of the condensed consolidated balance sheets, statements of operations, statements of comprehensive loss, statements of shareholders’ equity and statements of cash flows, as applicable. The operating results for the three- and nine-month periods ended September 30, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. Our balance sheet as of December 31, 2023 included herein has been derived from the audited balance sheet as of December 31, 2023 included in our 2023 Annual Report on Form 10-K (our “2023 Form 10-K”). These unaudited condensed consolidated financial statements should be read in conjunction with the audited annual consolidated financial statements and notes thereto included in our 2023 Form 10-K.
Reclassifications	Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current presentation format.
New Accounting Standards	New accounting standards In November 2023, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures,” which requires entities to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (the “CODM”) and included within each reported measure of segment profit or loss as well as an amount for other segment items by reportable segment and a description of its composition. ASU No. 2023-07 requires all annual disclosures about a reportable segment’s profit or loss and assets to be provided in interim periods as well. Among other things, this ASU also requires that a public entity disclose the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. ASU No. 2023-07 will be effective on a retrospective basis for annual periods beginning January 1, 2024 and for interim periods beginning January 1, 2025. This ASU is not expected to have a material impact on our consolidated financial statements other than increased disclosure requirements. In December 2023, the FASB issued ASU No. 2023-09, “Improvements to Income Tax Disclosures,” which requires entities to disclose, on an annual basis, specific categories in a tabular rate reconciliation using both percentages and reporting currency amounts and to provide additional information for reconciling items that meet a quantitative threshold. This ASU also requires that entities disclose on an annual basis: a) income taxes paid (net) disaggregated by federal, state and foreign taxes, b) income taxes paid (net) by individual jurisdiction, c) income (or loss) from continuing operations before income tax expense (or benefit) between domestic and foreign, and d) income tax expense (or benefit) from continuing operations by federal, state and foreign. Certain previous disclosure requirements on unrecognized tax benefits and cumulative amount of temporary differences are eliminated. ASU No. 2023-09 will be effective for us for annual periods beginning January 1, 2025. This ASU is not expected to have a material impact on our consolidated financial statements other than increased disclosure requirements. We do not expect other recently issued accounting standards to have a material impact on our financial position, results of operations or cash flows when they become effective.

Details Of Certain Accounts (Ta

Details Of Certain Accounts (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of other current assets	Other current assets consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Prepaids ​ $ 33,511 $ 28,352 Contract assets (Note 8) ​ ​ 12,888 ​ ​ 5,824 Deferred costs (Note 8) ​ 42,048 ​ 36,041 Other ​ 10,487 ​ 15,006 Total other current assets ​ $ 98,934 $ 85,223
Schedule of other assets, net	Other assets, net consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Prepaid charter (1) ​ $ 12,544 $ 12,544 Deferred costs (Note 8) ​ ​ 709 ​ 587 Other receivable (2) ​ 24,247 ​ 25,623 Intangible assets with finite lives, net ​ 3,840 ​ 4,105 Other ​ 1,978 ​ 1,964 Total other assets, net ​ $ 43,318 $ 44,823 (1) Represents prepayments to the owner of the Siem Helix 1 and the Siem Helix 2 to offset certain payment obligations associated with the vessels at the end of their respective charter term. (2) Represents the present value of the agreed-upon amounts that we are entitled to receive from Marathon Oil Corporation (“Marathon Oil”) for remaining P&A work to be performed by us on Droshky oil and gas properties we acquired from Marathon Oil in 2019.
Schedule of accrued liabilities	Accrued liabilities consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Accrued payroll and related benefits ​ $ 48,161 $ 59,010 Accrued interest ​ ​ 2,671 ​ ​ 4,181 Income tax payable ​ 1,644 ​ 1,938 Deferred revenue (Note 8) ​ 25,581 ​ 32,763 Earn-out consideration (1) ​ — ​ 85,000 Other (2) ​ 13,710 ​ 20,220 Total accrued liabilities ​ $ 91,767 $ 203,112 (1) Represents the final amount of the earn-out consideration associated with the acquisition of the Alliance group of companies (collectively “Alliance”) on July 1, 2022, which was paid to the seller of Alliance in cash on April 3, 2024. (2) Amounts as of December 31, 2023 included $9.0 million of credits towards future services that we granted for the purchase of five P&A systems and other assets . These credits were increased by $2.4 million with a charge to “Other expense, net” during the third quarter 2024 and were fully utilized as of September 30, 2024.
Schedule of other non-current liabilities	Other non-current liabilities consist of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Asset retirement obligations (Note 12) ​ $ 61,570 $ 61,356 Other (1) ​ 3,188 ​ 4,892 Total other non-current liabilities ​ $ 64,758 $ 66,248 (1) Amount as of December 31, 2023 included $2.6 million of credits offered by us in exchange for the purchase of P&A equipment, which were fully utilized as of September 30, 2024 (see above).

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2024
Leases [Abstract]
Schedule of components of lease cost	The following table details the components of our lease cost (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Operating lease cost ​ $ 22,643 ​ $ 18,836 ​ $ 65,475 $ 53,189 Variable lease cost ​ 2,236 ​ 6,058 ​ 8,353 ​ 16,223 Short-term lease cost ​ 18,665 ​ 18,751 ​ 41,324 ​ 43,644 Sublease income ​ (26) ​ (374) ​ (70) ​ (911) Net lease cost ​ $ 43,518 ​ $ 43,271 ​ $ 115,082 $ 112,145
Schedule of maturities of operating lease liabilities	Maturities of our operating lease liabilities as of September 30, 2024 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Facilities and ​ ​ ​ Vessels Equipment Total Less than one year ​ $ 78,073 ​ $ 6,567 $ 84,640 One to two years ​ 69,963 ​ 3,436 ​ 73,399 Two to three years ​ 61,771 ​ 2,653 ​ 64,424 Three to four years ​ 58,208 ​ 2,597 ​ 60,805 Four to five years ​ 52,748 ​ 2,381 ​ 55,129 Over five years ​ 99,552 ​ 7,577 ​ 107,129 Total lease payments ​ $ 420,315 ​ $ 25,211 $ 445,526 Less: imputed interest ​ (87,109) ​ (5,158) ​ (92,267) Total operating lease liabilities ​ $ 333,206 ​ $ 20,053 $ 353,259 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current operating lease liabilities ​ $ 54,098 ​ $ 5,768 $ 59,866 Non-current operating lease liabilities ​ 279,108 ​ 14,285 ​ 293,393 Total operating lease liabilities ​ $ 333,206 ​ $ 20,053 $ 353,259 ​ Maturities of our operating lease liabilities as of December 31, 2023 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Facilities and ​ ​ ​ Vessels Equipment Total Less than one year ​ $ 67,488 ​ $ 6,639 $ 74,127 One to two years ​ 55,453 ​ 3,508 ​ 58,961 Two to three years ​ 35,200 ​ 1,289 ​ 36,489 Three to four years ​ 26,245 ​ 1,272 ​ 27,517 Four to five years ​ 3,040 ​ 1,244 ​ 4,284 Over five years ​ — ​ 1,926 ​ 1,926 Total lease payments ​ $ 187,426 ​ $ 15,878 $ 203,304 Less: imputed interest ​ (22,419) ​ (2,038) ​ (24,457) Total operating lease liabilities ​ $ 165,007 ​ $ 13,840 $ 178,847 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current operating lease liabilities ​ $ 56,602 ​ $ 6,060 $ 62,662 Non-current operating lease liabilities ​ 108,405 ​ 7,780 ​ 116,185 Total operating lease liabilities ​ $ 165,007 ​ $ 13,840 $ 178,847
Schedule of weighted average remaining lease term and discount rate	The following table presents the weighted average remaining lease term and discount rate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 ​ 2023 Weighted average remaining lease term 6.0 years ​ 3.1 years Weighted average discount rate 7.89 % ​ 8.20 %
Schedule of other information related to operating leases	The following table presents other information related to our operating leases (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ ​ September 30, ​ 2024 2023 Cash paid for operating lease liabilities ​ $ 60,042 $ 51,733 Right-of-use assets obtained in exchange for new operating lease liabilities (1) ​ 213,480 ​ 25,463 (1) Our operating lease additions during the nine-month period ended September 30, 2024 are primarily related to the charter extensions for the Siem Helix 1 , the Siem Helix 2 , the Grand Canyon II and the Shelia Bordelon (Note 13). Our operating lease additions during the nine-month period ended September 30, 2023 are primarily related to the vessel charter for the Glomar Wave .

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt outstanding	Scheduled maturities of our long-term debt outstanding as of September 30, 2024 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ MARAD ​ 2029 ​ ​ ​ ​ Debt Notes Total Less than one year ​ $ 9,186 ​ $ — $ 9,186 One to two years ​ 9,644 ​ — ​ 9,644 Two to three years ​ 5,001 ​ — ​ 5,001 Three to four years ​ — ​ — ​ — Four to five years ​ — ​ 300,000 ​ 300,000 Gross debt ​ 23,831 ​ 300,000 ​ 323,831 Unamortized debt discount (1) ​ ​ — ​ ​ (1,243) ​ ​ (1,243) Unamortized debt issuance costs (1) ​ (1,220) ​ (6,695) ​ (7,915) Total debt ​ 22,611 ​ 292,062 ​ 314,673 Less current maturities ​ (9,186) ​ — ​ (9,186) Long-term debt ​ $ 13,425 ​ $ 292,062 $ 305,487 (1) Debt discount and debt issuance costs are amortized to interest expense over the term of the applicable debt agreement.
Schedule of redemption prices expressed as percentages of the principal amount	Prior to March 1, 2026, we may, at our option, redeem the 2029 Notes, in whole or in part, at a price equal to 100% of the aggregate principal amount of the notes to be redeemed, plus a make-whole premium and accrued and unpaid interest, if any, to, but excluding, the redemption date. On or after March 1, 2026, we may, at our option, redeem the 2029 Notes, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the notes to be redeemed) set forth below, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. Prior to March 1, 2026, following certain equity offerings we may, at our option, on any one or more occasions, redeem up to 40% of the 2029 Notes at a price equal to 109.750% of the aggregate principal amount of the notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, in an amount not exceeding the proceeds of such equity offerings. ​ ​ ​ ​ ​ ​ Redemption Year Price 2026 ​ 104.875% 2027 ​ 102.438% 2028 and thereafter ​ 100.000%
Schedule of components of net interest expense	The following table details the components of our net interest expense (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Interest expense ​ $ 8,414 ​ $ 4,830 ​ $ 25,594 $ 14,556 Interest income ​ (2,725) ​ (678) ​ (8,537) ​ (1,989) Net interest expense ​ $ 5,689 ​ $ 4,152 ​ $ 17,057 $ 12,567 ​

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of disaggregation of revenue	The following table provides information about disaggregated revenue by contract duration (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Well ​ ​ ​ Shallow Water ​ Production ​ Intercompany ​ Total ​ Intervention Robotics Abandonment Facilities Eliminations Revenue Three months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 130,150 ​ $ 48,906 ​ $ 53,410 ​ $ — ​ $ (38) ​ $ 232,428 Long-term ​ 52,517 ​ 35,620 ​ 18,185 ​ 20,695 ​ (17,026) ​ 109,991 Total ​ $ 182,667 ​ $ 84,526 ​ $ 71,595 ​ $ 20,695 ​ $ (17,064) ​ $ 342,419 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 139,743 ​ $ 26,995 ​ $ 73,037 ​ $ — ​ $ — ​ $ 239,775 Long-term ​ 85,624 ​ 48,651 ​ 14,235 ​ 24,469 ​ (17,084) ​ 155,895 Total ​ $ 225,367 ​ $ 75,646 ​ $ 87,272 ​ $ 24,469 ​ $ (17,084) ​ $ 395,670 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 417,716 ​ $ 118,275 ​ $ 121,142 ​ $ — ​ $ (6,471) ​ $ 650,662 Long-term ​ 206,089 ​ 97,809 ​ 28,147 ​ 70,247 ​ (49,527) ​ 352,765 Total ​ $ 623,805 ​ $ 216,084 ​ $ 149,289 ​ $ 70,247 ​ $ (55,998) ​ $ 1,003,427 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Short-term ​ $ 293,131 ​ $ 100,269 ​ $ 196,534 ​ $ — ​ $ (26) ​ $ 589,908 Long-term ​ 228,895 ​ 94,649 ​ 16,425 ​ 68,502 ​ (43,808) ​ 364,663 Total ​ $ 522,026 ​ $ 194,918 ​ $ 212,959 ​ $ 68,502 ​ $ (43,834) ​ $ 954,571 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Well ​ ​ ​ Shallow Water ​ Production ​ Intercompany ​ Total ​ Intervention Robotics Abandonment Facilities Eliminations Revenue Three months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 95,848 ​ $ 34,541 ​ $ 483 ​ $ 20,695 ​ $ (9,791) ​ $ 141,776 Decommissioning ​ 82,860 ​ 2,746 ​ 71,112 ​ — ​ (3,469) ​ 153,249 Renewables ​ 3,126 ​ 42,804 ​ — ​ — ​ (3,126) ​ 42,804 Other ​ 833 ​ 4,435 ​ — ​ — ​ (678) ​ 4,590 Total ​ $ 182,667 ​ $ 84,526 ​ $ 71,595 ​ $ 20,695 ​ $ (17,064) ​ $ 342,419 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 39,749 ​ $ 25,192 ​ $ 713 ​ $ 24,469 ​ $ (4,079) ​ $ 86,044 Decommissioning ​ 161,977 ​ 16,223 ​ 86,559 ​ — ​ (7,805) ​ 256,954 Renewables ​ 3,332 ​ 32,167 ​ — ​ — ​ (3,332) ​ 32,167 Other ​ 20,309 ​ 2,064 ​ — ​ — ​ (1,868) ​ 20,505 Total ​ $ 225,367 ​ $ 75,646 ​ $ 87,272 ​ $ 24,469 ​ $ (17,084) ​ $ 395,670 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2024 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 275,599 ​ $ 73,573 ​ $ 6,734 ​ $ 70,247 ​ $ (29,002) ​ $ 397,151 Decommissioning ​ 335,185 ​ 15,257 ​ 142,555 ​ — ​ (14,038) ​ 478,959 Renewables ​ 9,899 ​ 117,469 ​ — ​ — ​ (9,899) ​ 117,469 Other ​ 3,122 ​ 9,785 ​ — ​ — ​ (3,059) ​ 9,848 Total ​ $ 623,805 ​ $ 216,084 ​ $ 149,289 ​ $ 70,247 ​ $ (55,998) ​ $ 1,003,427 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 2023 ​ ​ ​ ​ ​ ​ ​ Production maximization ​ $ 139,898 ​ $ 73,220 ​ $ 7,682 ​ $ 68,502 ​ $ (12,504) ​ $ 276,798 Decommissioning ​ 350,773 ​ 39,144 ​ 205,277 ​ — ​ (17,819) ​ 577,375 Renewables ​ 8,042 ​ 76,730 ​ — ​ — ​ (8,042) ​ 76,730 Other ​ 23,313 ​ 5,824 ​ — ​ — ​ (5,469) ​ 23,668 Total ​ $ 522,026 ​ $ 194,918 ​ $ 212,959 ​ $ 68,502 ​ $ (43,834) ​ $ 954,571

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of computations of basic and diluted EPS	The computations of the numerator (earnings or loss) and denominator (shares) to derive the basic and diluted EPS amounts presented on the face of the accompanying condensed consolidated statements of operations are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Three Months Ended ​ ​ September 30, 2024 ​ September 30, 2023 ​ Income Shares Income Shares Basic: ​ ​ Net income ​ $ 29,514 ​ ​ $ 15,560 Less: Undistributed earnings allocated to participating securities ​ (29) ​ ​ ​ (27) Net income available to common shareholders, basic ​ $ 29,485 ​ 151,914 ​ $ 15,533 150,550 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted: ​ ​ ​ Net income available to common shareholders, basic ​ $ 29,485 ​ 151,914 ​ $ 15,533 150,550 Effect of dilutive securities: ​ ​ ​ Share-based awards other than participating securities ​ — ​ 2,937 ​ — 3,072 Undistributed earnings reallocated to participating securities ​ 1 ​ — ​ 1 — Net income available to common shareholders, diluted ​ $ 29,486 ​ 154,851 ​ $ 15,534 ​ 153,622 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, basic and diluted ​ $ 0.19 ​ ​ ​ $ 0.10 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ Nine Months Ended ​ ​ September 30, 2024 ​ September 30, 2023 ​ Income Shares Income Shares Basic: ​ ​ Net income ​ $ 35,516 ​ ​ $ 17,495 Less: Undistributed earnings allocated to participating securities ​ (36) ​ ​ ​ (30) Net income available to common shareholders, basic ​ $ 35,480 ​ 152,171 ​ $ 17,465 151,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, basic ​ $ 0.23 ​ ​ ​ $ 0.12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted: ​ ​ ​ Net income available to common shareholders, basic ​ $ 35,480 ​ 152,171 ​ $ 17,465 151,031 Effect of dilutive securities: ​ ​ ​ Share-based awards other than participating securities ​ — ​ 2,867 ​ — 2,905 Undistributed earnings reallocated to participating securities ​ 1 ​ — ​ 1 — Net income available to common shareholders, diluted ​ $ 35,481 ​ 155,038 ​ $ 17,466 153,936 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Earnings per share, diluted ​ $ 0.23 ​ ​ ​ $ 0.11 ​ ​
Schedule of shares excluded from diluted EPS calculation	The following potentially dilutive shares related to the 2023 Notes and the 2026 Notes were excluded from the diluted EPS calculation as they were anti-dilutive (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 2023 Notes — 2,652 — 2,996 2026 Notes — 28,676 1,729 28,676

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2024
Share-based Payment Arrangement [Abstract]
Schedule of grants of share-based awards	During the nine-month period ended September 30, 2024, the following grants of share-based awards were made under the 2005 Incentive Plan: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Grant Date ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ Date of Grant Award Type Shares/Units Per Share/Unit Vesting Period/Vesting Date January 1, 2024 (1) RSU 375,730 ​ $ 10.28 33% per year over three years January 1, 2024 (1) PSU 351,410 ​ $ 12.30 100% on December 31, 2026 January 1, 2024 (2) Restricted stock 5,776 ​ $ 10.28 100% on January 1, 2026 April 1, 2024 (2) Restricted stock 2,595 ​ $ 10.84 100% on January 1, 2026 July 1, 2024 (2) Restricted stock 2,356 ​ $ 11.94 100% on January 1, 2026 (1) Reflects grants to our executive officers. (2) Reflects grants to certain independent members of our Board who have elected to take their quarterly fees in stock in lieu of cash.

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of financial data by reportable segment	Certain financial data by reportable segment are summarized as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 ​ 2024 2023 Net revenues — ​ ​ ​ ​ ​ Well Intervention ​ $ 182,667 ​ $ 225,367 ​ $ 623,805 ​ $ 522,026 Robotics ​ 84,526 ​ 75,646 ​ 216,084 ​ 194,918 Shallow Water Abandonment ​ ​ 71,595 ​ ​ 87,272 ​ ​ 149,289 ​ ​ 212,959 Production Facilities ​ 20,695 ​ 24,469 ​ 70,247 ​ 68,502 Intercompany eliminations ​ (17,064) ​ (17,084) ​ (55,998) ​ (43,834) Total ​ $ 342,419 ​ $ 395,670 ​ $ 1,003,427 ​ $ 954,571 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income (loss) from operations — ​ ​ ​ ​ ​ Well Intervention ​ $ 16,109 ​ $ 16,120 ​ $ 64,087 ​ $ 11,357 Robotics ​ 24,158 ​ 20,665 ​ 58,008 ​ 43,226 Shallow Water Abandonment ​ ​ 8,808 ​ ​ 27,624 ​ ​ (3,901) ​ ​ 54,208 Production Facilities ​ 8,288 ​ 8,886 ​ 15,842 ​ 21,817 Segment operating income ​ 57,363 ​ 73,295 ​ 134,036 ​ 130,608 Change in fair value of contingent consideration ​ ​ — ​ ​ (16,499) ​ ​ — ​ ​ (31,319) Corporate, eliminations and other ​ (12,723) ​ (20,568) ​ (37,479) ​ (51,159) Total ​ $ 44,640 ​ $ 36,228 ​ $ 96,557 ​ $ 48,130 Net interest expense ​ ​ (5,689) ​ ​ (4,152) ​ ​ (17,057) ​ ​ (12,567) Losses related to convertible senior notes ​ ​ — ​ ​ — ​ ​ (20,922) ​ ​ — Other non-operating expense, net ​ ​ 83 ​ ​ (8,179) ​ ​ (515) ​ ​ (8,437) Income before income taxes ​ $ 39,034 ​ $ 23,897 ​ $ 58,063 ​ $ 27,126
Schedule of intercompany segment revenues	Intercompany segment revenues are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Nine Months Ended ​ ​ September 30, ​ September 30, ​ 2024 2023 2024 2023 Well Intervention ​ $ 8,054 ​ $ 6,832 ​ $ 26,224 ​ $ 18,174 Robotics ​ 8,972 ​ 10,252 ​ 29,548 ​ 25,634 Shallow Water Abandonment ​ 38 ​ — ​ 226 ​ 26 Total ​ $ 17,064 ​ $ 17,084 ​ $ 55,998 ​ $ 43,834
Schedule of total assets by reportable segment	The following table reflects total assets by reportable segment (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ December 31, ​ 2024 2023 Well Intervention ​ $ 1,926,350 ​ $ 1,790,971 Robotics ​ 216,369 ​ 177,801 Shallow Water Abandonment ​ ​ 201,143 ​ ​ 256,356 Production Facilities ​ 107,874 ​ 120,234 Corporate and other ​ 209,413 ​ 210,674 Total ​ $ 2,661,149 ​ $ 2,556,036 ​

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]
Schedule of asset retirement obligations	The following table describes the changes in our AROs (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 2023 AROs at January 1, ​ $ 61,356 ​ $ 51,956 Revisions in estimates ​ (4,010) ​ — Accretion expense ​ 4,224 ​ 3,586 AROs at September 30, ​ $ 61,570 ​ $ 55,542 ​

Cash Flow Information (Tables)

Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2024
Supplemental Cash Flow Information [Abstract]
Schedule of supplemental cash flow information	The following table provides supplemental cash flow information (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine Months Ended ​ ​ September 30, ​ 2024 2023 Interest paid ​ $ 25,331 ​ $ 17,027 Income taxes paid (1) ​ 10,050 ​ 5,209 (1) Exclusive of any income tax refunds.

Allowance For Credit Losses (Ta

Allowance For Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Schedule of activities in allowance for credit losses	The following table sets forth the activity in our allowance for credit losses (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ 2024 2023 Balance at January 1, ​ $ 3,407 ​ $ 2,277 Additions (1) ​ 475 ​ 1,020 Balance at September 30, ​ $ 3,882 ​ $ 3,297 (1) Additions reflect reserves for expected credit losses during the respective periods.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of principal amount and estimated fair value of long-term debt	The principal amount and estimated fair value of our long-term debt are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2024 ​ December 31, 2023 ​ ​ Principal ​ Fair ​ Principal ​ Fair ​ Amount (1) Value (2) Amount (1) Value (2) 2026 Notes (fully redeemed March 2024) ​ $ — ​ $ — ​ $ 40,199 ​ $ 64,117 MARAD Debt (matures February 2027) ​ ​ 23,831 ​ ​ 23,819 ​ ​ 32,580 ​ ​ 32,348 2029 Notes (mature March 2029) ​ ​ 300,000 ​ ​ 322,050 ​ ​ 300,000 ​ ​ 315,987 Total debt ​ $ 323,831 ​ $ 345,869 ​ $ 372,779 ​ $ 412,452 (1) Principal amount includes current maturities and excludes any related unamortized debt discount and debt issuance costs. See Note 5 for additional disclosures on our long-term debt. (2) The estimated fair value was determined using Level 2 fair value inputs under the market approach, which was determined using quotes in inactive markets.

Company Overview (Details)

Company Overview (Details)	9 Months Ended
	Sep. 30, 2024 segment item
Business Segment Information
Number of reportable segments | segment	4
Well Intervention
Business Segment Information
Number of long-term chartered vessels | item	2

Details Of Certain Accounts - O

Details Of Certain Accounts - Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Prepaids	$ 33,511	$ 28,352
Contract assets	12,888	5,824
Deferred costs	42,048	36,041
Other	10,487	15,006
Total other current assets	$ 98,934	$ 85,223

Details Of Certain Accounts -_2

Details Of Certain Accounts - Other Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Other Assets, Noncurrent Disclosure [Abstract]
Prepaid charter	$ 12,544	$ 12,544
Deferred costs	709	587
Other receivable	24,247	25,623
Intangible assets with finite lives, net	3,840	4,105
Other	1,978	1,964
Total other assets, net	$ 43,318	$ 44,823

Details Of Certain Accounts - A

Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($)	3 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Accrued payroll and related benefits	$ 48,161,000	$ 59,010,000
Accrued interest	2,671,000	4,181,000
Income tax payable	1,644,000	1,938,000
Deferred revenue	25,581,000	32,763,000
Earn-out consideration		85,000,000
Other	13,710,000	20,220,000
Total accrued liabilities	91,767,000	203,112,000
P&A Systems
Asset Acquisition, Contingent Consideration [Line Items]
Credit towards future services, current		$ 9,000,000
Number of P&A systems		5
Increase in credits towards future services	$ 2,400,000

Details Of Certain Accounts -_3

Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Other Liabilities, Noncurrent [Abstract]
Asset retirement obligations	$ 61,570	$ 61,356
Other	3,188	4,892
Total other non-current liabilities	$ 64,758	66,248
P&A Systems
Asset Acquisition, Contingent Consideration [Line Items]
Credit towards future services, non-current		$ 2,600

Leases - Components Of Lease Co

Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Lease, Cost [Abstract]
Operating lease cost	$ 22,643	$ 18,836	$ 65,475	$ 53,189
Variable lease cost	2,236	6,058	8,353	16,223
Short-term lease cost	18,665	18,751	41,324	43,644
Sublease income	(26)	(374)	(70)	(911)
Net lease cost	$ 43,518	$ 43,271	$ 115,082	$ 112,145

Leases - Maturities Of Operatin

Leases - Maturities Of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract]
Less than one year	$ 84,640	$ 74,127
One to two years	73,399	58,961
Two to three years	64,424	36,489
Three to four years	60,805	27,517
Four to five years	55,129	4,284
Over five years	107,129	1,926
Total lease payments	445,526	203,304
Less: imputed interest	(92,267)	(24,457)
Total operating lease liabilities	353,259	178,847
Current operating lease liabilities	59,866	62,662
Non-current operating lease liabilities	293,393	116,185
Vessels
Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract]
Less than one year	78,073	67,488
One to two years	69,963	55,453
Two to three years	61,771	35,200
Three to four years	58,208	26,245
Four to five years	52,748	3,040
Over five years	99,552
Total lease payments	420,315	187,426
Less: imputed interest	(87,109)	(22,419)
Total operating lease liabilities	333,206	165,007
Current operating lease liabilities	54,098	56,602
Non-current operating lease liabilities	279,108	108,405
Facilities and Equipment
Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract]
Less than one year	6,567	6,639
One to two years	3,436	3,508
Two to three years	2,653	1,289
Three to four years	2,597	1,272
Four to five years	2,381	1,244
Over five years	7,577	1,926
Total lease payments	25,211	15,878
Less: imputed interest	(5,158)	(2,038)
Total operating lease liabilities	20,053	13,840
Current operating lease liabilities	5,768	6,060
Non-current operating lease liabilities	$ 14,285	$ 7,780

Leases - Weighted Average Remai

Leases - Weighted Average Remaining Lease Term And Discount Rate (Details)	Sep. 30, 2024	Dec. 31, 2023
Leases [Abstract]
Weighted average remaining lease term (in years)	6 years	3 years 1 month 6 days
Weighted average discount rate (as a percent)	7.89%	8.20%

Leases - Other Information Rela

Leases - Other Information Related To Operating Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Cash paid for operating lease liabilities	$ 60,042	$ 51,733
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 213,480	$ 25,463

Long-Term Debt - Maturities Of

Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 01, 2023
Debt Instrument [Line Items]
Less than one year	$ 9,186
One to two years	9,644
Two to three years	5,001
Four to five years	300,000
Gross debt	323,831	$ 372,779
Unamortized debt discount	(1,243)
Unamortized debt issuance costs	(7,915)
Total debt	314,673
Less: current maturities	(9,186)	(48,292)
Long-term debt	305,487	313,430
MARAD Debt (matures February 2027)
Debt Instrument [Line Items]
Less than one year	9,186
One to two years	9,644
Two to three years	5,001
Gross debt	23,831	32,580
Unamortized debt issuance costs	(1,220)
Total debt	22,611
Less: current maturities	(9,186)
Long-term debt	13,425
2029 Notes (mature March 2029)
Debt Instrument [Line Items]
Four to five years	300,000
Gross debt	300,000	$ 300,000	$ 300,000
Unamortized debt discount	(1,243)
Unamortized debt issuance costs	(6,695)
Total debt	292,062
Long-term debt	$ 292,062

Long-Term Debt - Credit Agreeme

Long-Term Debt - Credit Agreement (Details) - ABL Facility Maturing September 2026 $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Borrowing capacity	$ 120
Maturity date	Aug. 02, 2029
Springing maturity period	91 days
Outstanding principal amount with a springing maturity	$ 50
Additional commitments (up to)	30
Sub-limit for the issuance of letters of credit	55
Borrowings under ABL Facility	0
Available borrowing capacity	74.7
Letters of credit issued	$ 31.6
Pro Forma
Debt Instrument [Line Items]
Available borrowing capacity (as a percent of borrowing base)	10%
Permitted debt for the deferred purchase price of property	$ 50
Availability of the borrowing base to satisfy and maintain fixed charge ratio	$ 12
Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Fixed charge coverage ratio	1
Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
United States
Debt Instrument [Line Items]
Borrowing capacity	$ 85
United States | SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%
United States | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2%
United States | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	0.50%
United States | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1%
United Kingdom
Debt Instrument [Line Items]
Borrowing capacity	$ 35
United Kingdom | SOFR
Debt Instrument [Line Items]
Adjustment on variable rate (as a percent)	0.10%
United Kingdom | SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%
United Kingdom | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2%
United Kingdom | SONIA | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%
United Kingdom | SONIA | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2%

Long-Term Debt - MARAD Debt (De

Long-Term Debt - MARAD Debt (Details) - MARAD Debt (matures February 2027)	9 Months Ended
	Sep. 30, 2024
Debt Instrument [Line Items]
Guarantor obligations (as a percent)	50%
Frequency of periodic payment	semi-annual
Maturity date	February 2027
Interest rate (as a percent)	4.93%

Long-Term Debt - 2029 Notes (De

Long-Term Debt - 2029 Notes (Details) - USD ($) $ in Thousands		9 Months Ended
	Dec. 01, 2023	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Gross debt		$ 323,831	$ 372,779
2029 Notes (mature March 2029)
Debt Instrument [Line Items]
Gross debt	$ 300,000	$ 300,000	$ 300,000
Proceeds from debt, net of discount and issuance costs	$ 291,100
Interest rate (as a percent)		9.75%
Frequency of periodic payment		semi-annually
Maturity date		Mar. 01, 2029
Redemption as a percentage of principal amount (as a percent)		100%
2029 Notes (mature March 2029) | 2026
Debt Instrument [Line Items]
Redemption as a percentage of principal amount (as a percent)		104.875%
2029 Notes (mature March 2029) | 2027
Debt Instrument [Line Items]
Redemption as a percentage of principal amount (as a percent)		102.438%
2029 Notes (mature March 2029) | 2028 and thereafter
Debt Instrument [Line Items]
Redemption as a percentage of principal amount (as a percent)		100%
2029 Notes (mature March 2029) | Change of Control
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount (as a percent)		101%
2029 Notes (mature March 2029) | Minimum
Debt Instrument [Line Items]
Redemption as a percentage of principal amount (as a percent)		40%
2029 Notes (mature March 2029) | Maximum
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount (as a percent)		109.75%

Long-Term Debt - Convertible Se

Long-Term Debt - Convertible Senior Notes Due 2026 (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jan. 31, 2024
Debt Instrument [Line Items]
Cash paid for retirement of debt						$ 60,720	$ 30,415
Losses related to convertible senior notes						20,922
Interest expense			$ 8,414		$ 4,830	25,594	14,556
Amortization of debt issuance costs						1,611	1,840
Carrying amount			314,673			314,673
Unamortized debt discount			$ 1,243			$ 1,243
2026 Notes (fully redeemed March 2024)
Debt Instrument [Line Items]
Interest rate (as a percent)			6.75%			6.75%
Effective interest rate (as a percent)			7.60%			7.60%
Interest expense					3,700	$ 400	11,100
Coupon interest expense					3,400	300	10,100
Amortization of debt issuance costs					$ 300	$ 100	$ 1,000
2026 Notes (fully redeemed March 2024) | Privately Negotiated Agreements
Debt Instrument [Line Items]
Principal amount repurchased		$ 159,800
Shares issued for repurchase of debt (in shares)		1.5
Cash paid for retirement of debt		$ 229,700
Accrued and unpaid cash interest		3,800
Losses related to convertible senior notes				$ 37,400
2026 Notes (fully redeemed March 2024) | Notes Tendered for Conversion in December
Debt Instrument [Line Items]
Repurchase amount	$ 300
Principal amount tendered for conversion		$ 200		$ 200
Carrying amount	200
2026 Notes (fully redeemed March 2024) | Notes subject to Redemption in March
Debt Instrument [Line Items]
Cash paid for retirement of debt	60,200
Losses related to convertible senior notes	$ 20,900
Principal amount tendered for conversion								$ 39,700
Remaining principal amount subject to redemption								300
Principal amount subject to redemption								$ 40,000

Long-Term Debt - 2026 Capped Ca

Long-Term Debt - 2026 Capped Calls (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2023	Mar. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Proceeds from settlement of capped calls			$ 4,381
Fair value of capped call transactions			$ 4,381
2026 Capped Calls
Debt Instrument [Line Items]
Proceeds from settlement of capped calls	$ 15,600
Fair value of capped call transactions	14,200	$ 4,400
Gain on change in fair value	$ 1,400

Long-Term Debt - Other (Details

Long-Term Debt - Other (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 15, 2023
Debt Instrument [Line Items]
Interest expense	$ 8,414	$ 4,830	$ 25,594	$ 14,556
2023 Notes (matured September 2023)
Debt Instrument [Line Items]
Interest rate (as a percent)					4.125%
Effective interest rate (as a percent)					4.80%
Interest expense		$ 300		$ 1,000
2023 Notes Converted (matured September 2023)
Debt Instrument [Line Items]
Repurchase amount					$ 29,600
Principal amount repaid					29,200
Remaining 2023 Notes (matured September 2023)
Debt Instrument [Line Items]
Principal amount repaid					$ 800

Long-Term Debt - Components Of

Long-Term Debt - Components Of Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Disclosure [Abstract]
Interest expense	$ 8,414	$ 4,830	$ 25,594	$ 14,556
Interest income	(2,725)	(678)	(8,537)	(1,989)
Net interest expense	$ 5,689	$ 4,152	$ 17,057	$ 12,567

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax provision	$ 9,520	$ 8,337	$ 22,547	$ 9,631
Effective tax rate	24.40%	34.90%	38.80%	35.50%

Share Repurchase Programs (Deta

Share Repurchase Programs (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share Repurchase Programs
Cost of shares repurchased	$ 1,939	$ 10,218	$ 12,068
2023 Repurchase Program
Share Repurchase Programs
Authorized repurchase amount		$ 200,000
Shares repurchased (in shares)		937,585
Cost of shares repurchased		$ 10,200
Average cost per share (USD per share)		$ 10.87

Revenue From Contracts With C_3

Revenue From Contracts With Customers - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue From Contracts With Customers
Total Revenue	$ 342,419	$ 395,670	$ 1,003,427	$ 954,571
Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(17,064)	(17,084)	(55,998)	(43,834)
Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	182,667	225,367	623,805	522,026
Well Intervention | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(8,054)	(6,832)	(26,224)	(18,174)
Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	84,526	75,646	216,084	194,918
Robotics | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(8,972)	(10,252)	(29,548)	(25,634)
Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	71,595	87,272	149,289	212,959
Shallow Water Abandonment | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(38)		(226)	(26)
Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	20,695	24,469	70,247	68,502
Production maximization
Revenue From Contracts With Customers
Total Revenue	141,776	86,044	397,151	276,798
Production maximization | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(9,791)	(4,079)	(29,002)	(12,504)
Production maximization | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	95,848	39,749	275,599	139,898
Production maximization | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	34,541	25,192	73,573	73,220
Production maximization | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	483	713	6,734	7,682
Production maximization | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	20,695	24,469	70,247	68,502
Decommissioning
Revenue From Contracts With Customers
Total Revenue	153,249	256,954	478,959	577,375
Decommissioning | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(3,469)	(7,805)	(14,038)	(17,819)
Decommissioning | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	82,860	161,977	335,185	350,773
Decommissioning | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	2,746	16,223	15,257	39,144
Decommissioning | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	71,112	86,559	142,555	205,277
Renewables
Revenue From Contracts With Customers
Total Revenue	42,804	32,167	117,469	76,730
Renewables | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(3,126)	(3,332)	(9,899)	(8,042)
Renewables | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	3,126	3,332	9,899	8,042
Renewables | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	42,804	32,167	117,469	76,730
Other
Revenue From Contracts With Customers
Total Revenue	4,590	20,505	9,848	23,668
Other | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(678)	(1,868)	(3,059)	(5,469)
Other | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	833	20,309	3,122	23,313
Other | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	4,435	2,064	9,785	5,824
Short-term
Revenue From Contracts With Customers
Total Revenue	232,428	239,775	650,662	589,908
Short-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(38)		(6,471)	(26)
Short-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	130,150	139,743	417,716	293,131
Short-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	48,906	26,995	118,275	100,269
Short-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	53,410	73,037	121,142	196,534
Long-term
Revenue From Contracts With Customers
Total Revenue	109,991	155,895	352,765	364,663
Long-term | Intercompany Eliminations
Revenue From Contracts With Customers
Total Revenue	(17,026)	(17,084)	(49,527)	(43,808)
Long-term | Well Intervention | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	52,517	85,624	206,089	228,895
Long-term | Robotics | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	35,620	48,651	97,809	94,649
Long-term | Shallow Water Abandonment | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	18,185	14,235	28,147	16,425
Long-term | Production Facilities | Reportable Segments
Revenue From Contracts With Customers
Total Revenue	$ 20,695	$ 24,469	$ 70,247	$ 68,502

Revenue From Contracts With C_4

Revenue From Contracts With Customers - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Net contract assets	$ 12.9		$ 12.9		$ 5.8
Credit losses on contract assets	0	$ 0	0	$ 0
Net contract liabilities	25.6		25.6		32.8
Revenue recognized	12.6	15.2	34.4	8.4
Deferred contract costs	42.8		42.8		$ 36.6
Amortization of deferred contract costs	$ 9.9	$ 13.7	$ 41.1	$ 32.8

Revenue From Contracts With C_5

Revenue From Contracts With Customers - Remaining Performance Obligations (Details) $ in Millions	Sep. 30, 2024 USD ($)
Revenue From Contracts With Customers
Unsatisfied performance obligations	$ 1,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue From Contracts With Customers
Unsatisfied performance obligations	$ 260.6
Expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue From Contracts With Customers
Unsatisfied performance obligations	$ 637.2
Expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue From Contracts With Customers
Unsatisfied performance obligations	$ 712.9
Expected timing of satisfaction	36 months

Earnings Per Share - Computatio

Earnings Per Share - Computations Of Basic And Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic:
Net income	$ 29,514	$ 15,560	$ 35,516	$ 17,495
Less: Undistributed earnings allocated to participating securities	(29)	(27)	(36)	(30)
Net income available to common shareholders, basic	$ 29,485	$ 15,533	$ 35,480	$ 17,465
Weighted average number of shares outstanding, basic (in shares)	151,914	150,550	152,171	151,031
Diluted:
Net income available to common shareholders, basic	$ 29,485	$ 15,533	$ 35,480	$ 17,465
Effect of dilutive securities:
Share-based awards other than participating securities (in shares)	2,937	3,072	2,867	2,905
Undistributed earnings reallocated to participating securities	$ 1	$ 1	$ 1	$ 1
Net income available to common shareholders, diluted	$ 29,486	$ 15,534	$ 35,481	$ 17,466
Weighted average number of shares outstanding, diluted (in shares)	154,851	153,622	155,038	153,936
Earnings per share, basic (in dollars per share)	$ 0.19	$ 0.10	$ 0.23	$ 0.12
Earnings per share, diluted (in dollars per share)	$ 0.19	$ 0.10	$ 0.23	$ 0.11

Earnings Per Share - Potentiall

Earnings Per Share - Potentially Dilutive Shares Excluded From Diluted EPS Calculation (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
2023 Notes
Earnings Per Share
Antidilutive securities (in shares)	2,652		2,996
2026 Notes
Earnings Per Share
Antidilutive securities (in shares)	28,676	1,729	28,676

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details)		3 Months Ended			9 Months Ended
	May 15, 2024 shares	Sep. 30, 2024 USD ($) item shares	Mar. 31, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) item shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Employee Benefit Plans
Number of active incentive plans					1
Deferred Contribution Plans
Employee Benefit Plans
Plan cost recognized		$ 1,300,000		$ 1,000,000	$ 4,100,000	$ 3,200,000
2005 Incentive Plan
Employee Benefit Plans
Additional shares authorized for issuance (in shares) | shares	7,000,000
Shares available for issuance (in shares) | shares		9,500,000			9,500,000
Restricted Stock
Employee Benefit Plans
Granted to executive officers and other employees (in shares) | shares					0
Compensation cost		$ 100,000		300,000	$ 700,000	1,000,000
PSUs
Employee Benefit Plans
Number of components of equity awards granted | item		2			2
Percentage based on service and market conditions					50%
Percentage based on service and performance conditions					50%
Compensation cost		$ 1,600,000		1,200,000	$ 4,400,000	3,500,000
Performance Period					3 years
Share-based payment awards vested (in shares) | shares			452,381
Award vesting percentage			181%
PSUs | Common Stock
Employee Benefit Plans
Shares issued upon vesting (in shares) | shares			818,812
Fair value of awards vested			$ 8,400,000
PSUs | Maximum
Employee Benefit Plans
Award vesting percentage					200%
PSUs | Minimum
Employee Benefit Plans
Award vesting percentage					0%
RSUs
Employee Benefit Plans
Compensation cost		1,500,000		3,200,000	$ 5,200,000	5,500,000
Fixed Value Cash Awards
Employee Benefit Plans
Long-term incentive cash awards granted		6,100,000			$ 6,100,000		$ 6,000,000
Vesting period					3 years
Deferred compensation cost		$ 1,400,000		$ 1,100,000	$ 4,100,000	$ 3,500,000
ESPP
Employee Benefit Plans
Shares available for issuance (in shares) | shares		1,000,000			1,000,000
Purchase limit per employee (in shares) | shares					260

Employee Benefit Plans - Share-

Employee Benefit Plans - Share-Based Awards Granted (Details) - $ / shares				3 Months Ended	9 Months Ended
	Jul. 01, 2024	Apr. 01, 2024	Jan. 01, 2024	Mar. 31, 2024	Sep. 30, 2024
RSUs | Officers
Employee Benefit Plans
Date of Grant			Jan. 01, 2024
Shares/Units			375,730
Grant Date Fair Value Per Share/Unit			$ 10.28
Vesting Percentage			33%
Vesting Period			3 years
RSUs | Board of Directors
Employee Benefit Plans
Date of Grant	Jul. 01, 2024
Shares/Units	2,356
Grant Date Fair Value Per Share/Unit	$ 11.94
Vesting Percentage	100%
Vesting Date	Jan. 01, 2026
PSUs
Employee Benefit Plans
Vesting Percentage				181%
PSUs | Officers
Employee Benefit Plans
Date of Grant			Jan. 01, 2024
Shares/Units			351,410
Grant Date Fair Value Per Share/Unit			$ 12.30
Vesting Percentage			100%
Vesting Date			Dec. 31, 2026
Restricted Stock
Employee Benefit Plans
Shares/Units					0
Restricted Stock | Board of Directors
Employee Benefit Plans
Date of Grant		Apr. 01, 2024	Jan. 01, 2024
Shares/Units		2,595	5,776
Grant Date Fair Value Per Share/Unit		$ 10.84	$ 10.28
Vesting Percentage		100%	100%
Vesting Date		Jan. 01, 2026	Jan. 01, 2026

Business Segment Information -

Business Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments	4

Business Segment Information _2

Business Segment Information - Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Segment Information
Net revenues	$ 342,419	$ 395,670	$ 1,003,427	$ 954,571
Change in fair value of contingent consideration		(16,499)		(31,319)
Income (loss) from operations	44,640	36,228	96,557	48,130
Net interest expense	(5,689)	(4,152)	(17,057)	(12,567)
Losses related to convertible senior notes			(20,922)
Other non-operating expense, net	83	(8,179)	(515)	(8,437)
Income before income taxes	39,034	23,897	58,063	27,126
Reportable Segments
Business Segment Information
Income (loss) from operations	57,363	73,295	134,036	130,608
Intercompany Eliminations
Business Segment Information
Net revenues	(17,064)	(17,084)	(55,998)	(43,834)
Corporate, Eliminations and Other
Business Segment Information
Income (loss) from operations	(12,723)	(20,568)	(37,479)	(51,159)
Well Intervention | Reportable Segments
Business Segment Information
Net revenues	182,667	225,367	623,805	522,026
Income (loss) from operations	16,109	16,120	64,087	11,357
Well Intervention | Intercompany Eliminations
Business Segment Information
Net revenues	(8,054)	(6,832)	(26,224)	(18,174)
Robotics | Reportable Segments
Business Segment Information
Net revenues	84,526	75,646	216,084	194,918
Income (loss) from operations	24,158	20,665	58,008	43,226
Robotics | Intercompany Eliminations
Business Segment Information
Net revenues	(8,972)	(10,252)	(29,548)	(25,634)
Shallow Water Abandonment | Reportable Segments
Business Segment Information
Net revenues	71,595	87,272	149,289	212,959
Income (loss) from operations	8,808	27,624	(3,901)	54,208
Shallow Water Abandonment | Intercompany Eliminations
Business Segment Information
Net revenues	(38)		(226)	(26)
Production Facilities | Reportable Segments
Business Segment Information
Net revenues	20,695	24,469	70,247	68,502
Income (loss) from operations	$ 8,288	$ 8,886	$ 15,842	$ 21,817

Business Segment Information _3

Business Segment Information - Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Segment Information
Net revenues	$ (342,419)	$ (395,670)	$ (1,003,427)	$ (954,571)
Intercompany Eliminations
Business Segment Information
Net revenues	17,064	17,084	55,998	43,834
Intercompany Eliminations | Well Intervention
Business Segment Information
Net revenues	8,054	6,832	26,224	18,174
Intercompany Eliminations | Robotics
Business Segment Information
Net revenues	8,972	$ 10,252	29,548	25,634
Intercompany Eliminations | Shallow Water Abandonment
Business Segment Information
Net revenues	$ 38		$ 226	$ 26

Business Segment Information _4

Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Business Segment Information
Total assets	$ 2,661,149	$ 2,556,036
Corporate and Other
Business Segment Information
Total assets	209,413	210,674
Well Intervention | Reportable Segments
Business Segment Information
Total assets	1,926,350	1,790,971
Robotics | Reportable Segments
Business Segment Information
Total assets	216,369	177,801
Shallow Water Abandonment | Reportable Segments
Business Segment Information
Total assets	201,143	256,356
Production Facilities | Reportable Segments
Business Segment Information
Total assets	$ 107,874	$ 120,234

Asset Retirement Obligations -

Asset Retirement Obligations - Changes in AROs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Changes in our AROs:
AROs at beginning of year	$ 61,356	$ 51,956
Revisions in estimates	(4,010)
Accretion expense	4,224	3,586
AROs at end of period	$ 61,570	$ 55,542

Commitments And Contingencies_2

Commitments And Contingencies And Other Matters (Details)	1 Months Ended
	Jan. 31, 2023
Glomar Wave
Commitments And Contingencies [Line Items]
Term of charter agreement	3 years

Cash Flow Information - Supplem

Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 25,331	$ 17,027
Income taxes paid	$ 10,050	$ 5,209

Cash Flow Information - Narrati

Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Non-cash capital additions	$ 0.4	$ 1.1
P&A Systems
Non-cash financing activities
Non-cash settlement of financing liability			$ 14

Allowance For Credit Losses - A

Allowance For Credit Losses - Activities In Allowance For Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Allowance for credit losses
Balance at beginning of year	$ 3,407	$ 2,277
Additions	475	1,020
Balance at end of period	$ 3,882	$ 3,297

Fair Value Measurements - Princ

Fair Value Measurements - Principal Amount And Estimated Fair Value Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 01, 2023
Fair Value Measurements
Principal Amount	$ 323,831	$ 372,779
Fair Value	345,869	412,452
2026 Notes (fully redeemed March 2024)
Fair Value Measurements
Principal Amount		40,199
Fair Value		64,117
MARAD Debt (matures February 2027)
Fair Value Measurements
Principal Amount	23,831	32,580
Fair Value	23,819	32,348
2029 Notes (mature March 2029)
Fair Value Measurements
Principal Amount	300,000	300,000	$ 300,000
Fair Value	$ 322,050	$ 315,987

Uncategorized Items - hlx-20240

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 332,191,000