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Details Of Certain Accounts (Tables) | 12 Months Ended
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Dec. 31, 2024
Organization |
Schedule of other current assets | Other current assets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Prepaids | ​ | $ | 26,780 |  | $ | 28,352
Income tax receivable | ​ |  | 2,635 |  | ​ | —
Contract assets (Note 11) | ​ | ​ | 12,221 | ​ | ​ | 5,824
Deferred costs (Note 11) | ​ | ​ | 31,874 | ​ | ​ | 36,041
Other | ​ |  | 9,512 |  | ​ | 15,006
Total other current assets | ​ | $ | 83,022 |  | $ | 85,223
Schedule of other assets, net | Other assets, net consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Prepaid charter (1) | ​ | $ | 12,544 | ​ | $ | 12,544
Deferred costs (Note 11) | ​ | ​ | 5,348 |  | ​ | 587
Other receivable (2) | ​ |  | 24,827 |  | ​ | 25,623
Intangible assets with finite lives, net | ​ |  | 3,630 |  | ​ | 4,105
Other | ​ |  | 1,829 |  | ​ | 1,964
Total other assets, net | ​ | $ | 48,178 |  | $ | 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 receivables for P&A work to be performed by us on Droshky oil and gas properties we acquired from Marathon Oil Corporation in 2019.
Schedule of accrued liabilities | Accrued liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Accrued payroll and related benefits | ​ | $ | 49,521 |  | $ | 59,010
Accrued interest | ​ | ​ | 10,278 | ​ | ​ | 4,181
Income tax payable | ​ | ​ | — | ​ | ​ | 1,938
Deferred revenue (Note 11) | ​ |  | 14,914 |  | ​ | 32,763
Earnout consideration (Note 3) | ​ |  | — |  | ​ | 85,000
Other (1) | ​ |  | 15,742 |  | ​ | 20,220
Total accrued liabilities | ​ | $ | 90,455 |  | $ | 203,112
(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, which were increased by $2.4 million with a charge to “Other expense, net” during 2024 and were fully utilized as of December 31, 2024.
Schedule of other non-current liabilities | Other non-current liabilities consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Deferred revenue (Note 11) | ​ | $ | 699 |  | $ | —
Asset retirement obligations (Note 15) | ​ | ​ | 62,947 |  | ​ | 61,356
Other (1) | ​ |  | 3,325 |  | ​ | 4,892
Total other non-current liabilities | ​ | $ | 66,971 |  | $ | 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 December 31, 2024 (see above).

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