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Details Of Certain Accounts (Tables) | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of other current assets | Other current assets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Prepaids | ​ | $ | 28,352 |  | $ | 26,609
Contract assets (Note 11) | ​ | ​ | 5,824 | ​ | ​ | 6,295
Deferred costs (Note 11) | ​ | ​ | 36,041 | ​ | ​ | 13,969
Other | ​ |  | 15,006 |  | ​ | 11,826
Total other current assets | ​ | $ | 85,223 |  | $ | 58,699
Schedule of other assets, net | Other assets, net consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Prepaid charter (1) | ​ | $ | 12,544 | ​ | $ | 12,544
Deferred costs (Note 11) | ​ | ​ | 587 |  | ​ | 6,432
Other receivable (2) | ​ |  | 25,623 |  | ​ | 24,827
Intangible assets with finite lives, net | ​ |  | 4,105 |  | ​ | 4,465
Other | ​ |  | 1,964 |  | ​ | 2,239
Total other assets, net | ​ | $ | 44,823 |  | $ | 50,507
(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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Accrued payroll and related benefits | ​ | $ | 59,010 |  | $ | 41,339
Accrued interest | ​ | ​ | 4,181 | ​ | ​ | 6,306
Income tax payable | ​ | ​ | 1,938 | ​ | ​ | 479
Deferred revenue (Note 11) | ​ |  | 32,763 |  | ​ | 9,961
Earn-out consideration (Note 3) | ​ |  | 85,000 |  | ​ | —
Other (1) | ​ |  | 20,220 |  | ​ | 15,489
Total accrued liabilities | ​ | $ | 203,112 |  | $ | 73,574
(1) | During the third quarter 2023, we acquired five P&A systems and other assets for total consideration of $17.6 million including $6.0 million in cash in addition to credits towards future services offered by us. Amount as of December 31, 2023 included $9.0 million of those credits.
Schedule of other non-current liabilities | Other non-current liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Asset retirement obligations (Note 15) | ​ | $ | 61,356 |  | $ | 51,956
Contingent consideration (Note 19) | ​ | ​ | — | ​ | ​ | 42,754
Other (1) | ​ |  | 4,892 |  | ​ | 520
Total other non-current liabilities | ​ | $ | 66,248 |  | $ | 95,230
(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 (see above).

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