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Leases (Tables) | 6 Months Ended
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Jun. 30, 2025
Leases |
Schedule of components of lease cost | The following table details the components of our lease cost (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Operating lease cost | ​ | $ | 23,349 | ​ | $ | 22,357 | ​ | $ | 44,579 |  | $ | 42,832
Variable lease cost | ​ |  | 2,686 | ​ |  | 3,060 | ​ |  | 5,032 |  | ​ | 6,117
Short-term lease cost | ​ |  | 12,746 | ​ |  | 13,745 | ​ |  | 21,689 |  | ​ | 22,659
Sublease income | ​ |  | (29) | ​ |  | (22) | ​ |  | (58) |  | ​ | (44)
Net lease cost | ​ | $ | 38,752 | ​ | $ | 39,140 | ​ | $ | 71,242 |  | $ | 71,564
Schedule of maturities of operating lease liabilities | Maturities of our operating lease liabilities as of June 30, 2025 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 79,119 | ​ | $ | 4,331 |  | $ | 83,450
One to two years | ​ |  | 65,767 | ​ |  | 3,684 |  | ​ | 69,451
Two to three years | ​ |  | 64,491 | ​ |  | 4,624 |  | ​ | 69,115
Three to four years | ​ |  | 55,173 | ​ |  | 2,652 |  | ​ | 57,825
Four to five years | ​ |  | 52,749 | ​ |  | 4,407 |  | ​ | 57,156
Over five years | ​ |  | 60,099 | ​ |  | 14,089 |  | ​ | 74,188
Total lease payments | ​ | $ | 377,398 | ​ | $ | 33,787 |  | $ | 411,185
Less: imputed interest | ​ |  | (70,258) | ​ |  | (9,283) |  | ​ | (79,541)
Total operating lease liabilities | ​ | $ | 307,140 | ​ | $ | 24,504 |  | $ | 331,644
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 57,884 | ​ | $ | 3,641 |  | $ | 61,525
Non-current operating lease liabilities | ​ |  | 249,256 | ​ |  | 20,863 |  | ​ | 270,119
Total operating lease liabilities | ​ | $ | 307,140 | ​ | $ | 24,504 |  | $ | 331,644
​ Maturities of our operating lease liabilities as of December 31, 2024 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 78,442 | ​ | $ | 5,324 |  | $ | 83,766
One to two years | ​ |  | 66,020 | ​ |  | 3,442 |  | ​ | 69,462
Two to three years | ​ |  | 61,771 | ​ |  | 3,871 |  | ​ | 65,642
Three to four years | ​ |  | 55,933 | ​ |  | 3,368 |  | ​ | 59,301
Four to five years | ​ |  | 52,748 | ​ |  | 3,185 |  | ​ | 55,933
Over five years | ​ |  | 86,257 | ​ |  | 15,736 |  | ​ | 101,993
Total lease payments | ​ | $ | 401,171 | ​ | $ | 34,926 |  | $ | 436,097
Less: imputed interest | ​ |  | (80,564) | ​ |  | (9,567) |  | ​ | (90,131)
Total operating lease liabilities | ​ | $ | 320,607 | ​ | $ | 25,359 |  | $ | 345,966
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 55,643 | ​ | $ | 4,339 |  | $ | 59,982
Non-current operating lease liabilities | ​ |  | 264,964 | ​ |  | 21,020 |  | ​ | 285,984
Total operating lease liabilities | ​ | $ | 320,607 | ​ | $ | 25,359 |  | $ | 345,966
Schedule of weighted average remaining lease term and discount rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2025 | ​ | 2024
Weighted average remaining lease term |  | 5.5 | years | ​ | 5.9 | years
Weighted average discount rate |  | 7.82 | % | ​ | 7.89 | %
Schedule of other information related to operating leases | The following table presents other information related to our operating leases (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30,
​ |  | 2025 |  | 2024
Cash paid for operating lease liabilities | ​ | $ | 43,394 |  | $ | 38,877
Right-of-use assets related to new operating lease liabilities (1) | ​ |  | 14,692 |  | ​ | 207,511
(1) | Our operating lease additions are primarily related to the charter for the Trym during the six-month period ended June 30, 2025, and the charter extensions for the Siem Helix 1, the Siem Helix 2, the Grand Canyon II and the Shelia Bordelon during the six-month period ended June 30, 2024 (Note 13).

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