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Details Of Certain Accounts (Tables) | 6 Months Ended
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Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of other current assets | Other current assets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Contract assets (Note 7) | ​ | $ | 9,097 |  | $ | 639
Prepaids | ​ |  | 17,069 |  | ​ | 18,228
Deferred costs (Note 7) | ​ |  | 6,841 |  | ​ | 2,967
Income tax receivable | ​ |  | — |  | ​ | 1,116
Other receivable (Note 11) | ​ |  | 30,052 |  | ​ | 28,805
Other | ​ |  | 5,931 |  | ​ | 6,519
Total other current assets | ​ | $ | 68,990 |  | $ | 58,274
Schedule of other assets, net | Other assets, net consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Deferred recertification and dry dock costs, net | ​ | $ | 29,532 |  | $ | 16,291
Deferred costs (Note 7) | ​ |  | 1,857 |  | ​ | 381
Prepaid charter (1) | ​ |  | 12,544 |  | ​ | 12,544
Intangible assets with finite lives, net | ​ |  | 3,119 |  | ​ | 3,472
Other | ​ |  | 2,762 |  | ​ | 1,967
Total other assets, net | ​ | $ | 49,814 |  | $ | 34,655
(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.
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Accrued payroll and related benefits | ​ | $ | 24,924 |  | $ | 28,657
Accrued interest | ​ | ​ | 6,379 | ​ | ​ | 6,746
Income tax payable | ​ |  | 12 |  | ​ | —
Deferred revenue (Note 7) | ​ |  | 6,386 |  | ​ | 8,272
Asset retirement obligations (Note 11) | ​ |  | 30,961 |  | ​ | 29,658
Other | ​ |  | 16,518 |  | ​ | 18,379
Total accrued liabilities | ​ | $ | 85,180 |  | $ | 91,712
Schedule of other non-current liabilities | Other non-current liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Deferred revenue (Note 7) | ​ | $ | — |  | $ | 476
Other | ​ |  | 196 |  | ​ | 499
Total other non-current liabilities | ​ | $ | 196 |  | $ | 975

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