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Details Of Certain Accounts (Tables) | 9 Months Ended
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Sep. 30, 2021
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,
​ |  | 2021 |  | 2020
Contract assets (Note 7) | ​ | $ | 367 |  | $ | 2,446
Prepaids | ​ |  | 18,301 |  | ​ | 15,904
Deferred costs (Note 7) | ​ |  | 8,792 |  | ​ | 23,522
Income tax receivable | ​ |  | — |  | ​ | 20,787
Other receivable (Note 11) | ​ |  | 28,184 |  | ​ | 29,782
Other | ​ |  | 6,798 |  | ​ | 9,651
Total other current assets | ​ | $ | 62,442 |  | $ | 102,092
Schedule of other assets, net | Other assets, net consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Deferred recertification and dry dock costs, net | ​ | $ | 16,401 |  | $ | 21,464
Deferred costs (Note 7) | ​ |  | 543 |  | ​ | 861
Charter deposit (1) | ​ |  | 12,544 |  | ​ | 12,544
Intangible assets with finite lives, net | ​ |  | 3,579 |  | ​ | 3,809
Other | ​ |  | 2,184 |  | ​ | 1,335
Total other assets, net | ​ | $ | 35,251 |  | $ | 40,013
(1) | This amount is deposited with the owner of the Siem Helix 2 to offset certain payment obligations associated with the vessel at the end of the charter term.
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Accrued payroll and related benefits | ​ | $ | 26,443 |  | $ | 24,768
Accrued interest | ​ | ​ | 2,760 | ​ | ​ | 7,098
Income tax payable | ​ |  | 581 |  | ​ | —
Deferred revenue (Note 7) | ​ |  | 9,425 |  | ​ | 8,140
Asset retirement obligations (Note 11) | ​ |  | 29,018 |  | ​ | 30,913
Other | ​ |  | 17,013 |  | ​ | 16,116
Total accrued liabilities | ​ | $ | 85,240 |  | $ | 87,035
Schedule of other non-current liabilities | Other non-current liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Deferred revenue (Note 7) | ​ | $ | 762 |  | $ | 1,869
Other | ​ |  | 719 |  | ​ | 2,009
Total other non-current liabilities | ​ | $ | 1,481 |  | $ | 3,878

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