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Details Of Certain Accounts (Tables) | 12 Months Ended
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Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of other current assets | Other current assets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Prepaids | ​ | $ | 26,609 |  | $ | 18,228
Income tax receivable | ​ |  | — |  | ​ | 1,116
Contract assets (Note 11) | ​ | ​ | 6,295 | ​ | ​ | 639
Deferred costs (Note 11) | ​ | ​ | 13,969 | ​ | ​ | 2,967
Other receivable (1) | ​ |  | — |  | ​ | 28,805
Other | ​ |  | 11,826 |  | ​ | 6,519
Total other current assets | ​ | $ | 58,699 |  | $ | 58,274
(1) | Represents 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; classified as current as the P&A work was expected to be performed within 12 months from December 31, 2021.
​
Schedule of other assets, net | Other assets, net consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Prepaid charter (1) | ​ | $ | 12,544 | ​ | $ | 12,544
Deferred costs (Note 11) | ​ | ​ | 6,432 |  | ​ | 381
Other receivable (2) | ​ |  | 24,827 |  | ​ | —
Intangible assets with finite lives, net | ​ |  | 4,465 |  | ​ | 3,472
Other | ​ |  | 2,239 |  | ​ | 1,967
Total other assets, net | ​ | $ | 50,507 |  | $ | 18,364
(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 agreed-upon amounts that we are entitled to receive from Marathon Oil; reclassified to non-current as we expect the remaining P&A work to be performed beyond 12 months from December 31, 2022.
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Accrued payroll and related benefits | ​ | $ | 41,339 |  | $ | 28,657
Accrued interest | ​ | ​ | 6,306 | ​ | ​ | 6,746
Income tax payable | ​ | ​ | 479 | ​ | ​ | —
Deferred revenue (Note 11) | ​ |  | 9,961 |  | ​ | 8,272
Asset retirement obligations (Note 15) | ​ |  | — |  | ​ | 29,658
Other | ​ |  | 15,489 |  | ​ | 18,379
Total accrued liabilities | ​ | $ | 73,574 |  | $ | 91,712
​
Schedule of other non-current liabilities | Other non-current liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Deferred revenue (Note 11) | ​ | $ | — |  | $ | 476
Asset retirement obligations (Note 15) | ​ |  | 51,956 |  | ​ | —
Contingent consideration (Note 19) | ​ | ​ | 42,754 | ​ | ​ | —
Other | ​ |  | 520 |  | ​ | 499
Total other non-current liabilities | ​ | $ | 95,230 |  | $ | 975

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