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Leases | 3 Months Ended
--- | ---
Mar. 31, 2024
Leases [Abstract] |
Leases | Note 4 — Leases We charter vessels and lease facilities and equipment under non-cancelable contracts that expire on various dates through 2031. The following table details the components of our lease cost (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ |  | 2024 |  | 2023
Operating lease cost | ​ | $ | 20,475 |  | $ | 17,006
Variable lease cost | ​ |  | 3,057 |  | ​ | 4,910
Short-term lease cost | ​ |  | 8,914 |  | ​ | 6,977
Sublease income | ​ |  | (22) |  | ​ | (331)
Net lease cost | ​ | $ | 32,424 |  | $ | 28,562
​ Maturities of our operating lease liabilities as of March 31, 2024 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 75,235 | ​ | $ | 6,232 |  | $ | 81,467
One to two years | ​ |  | 76,992 | ​ |  | 2,575 |  | ​ | 79,567
Two to three years | ​ |  | 63,907 | ​ |  | 1,270 |  | ​ | 65,177
Three to four years | ​ |  | 61,941 | ​ |  | 1,262 |  | ​ | 63,203
Four to five years | ​ |  | 53,539 | ​ |  | 1,169 |  | ​ | 54,708
Over five years | ​ |  | 125,999 | ​ |  | 1,656 |  | ​ | 127,655
Total lease payments | ​ | $ | 457,613 | ​ | $ | 14,164 |  | $ | 471,777
Less: imputed interest | ​ |  | (100,746) | ​ |  | (1,788) |  | ​ | (102,534)
Total operating lease liabilities | ​ | $ | 356,867 | ​ | $ | 12,376 |  | $ | 369,243
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 49,135 | ​ | $ | 5,757 |  | $ | 54,892
Non-current operating lease liabilities | ​ |  | 307,732 | ​ |  | 6,619 |  | ​ | 314,351
Total operating lease liabilities | ​ | $ | 356,867 | ​ | $ | 12,376 |  | $ | 369,243
​ Maturities of our operating lease liabilities as of December 31, 2023 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 67,488 | ​ | $ | 6,639 |  | $ | 74,127
One to two years | ​ |  | 55,453 | ​ |  | 3,508 |  | ​ | 58,961
Two to three years | ​ |  | 35,200 | ​ |  | 1,289 |  | ​ | 36,489
Three to four years | ​ |  | 26,245 | ​ |  | 1,272 |  | ​ | 27,517
Four to five years | ​ |  | 3,040 | ​ |  | 1,244 |  | ​ | 4,284
Over five years | ​ |  | — | ​ |  | 1,926 |  | ​ | 1,926
Total lease payments | ​ | $ | 187,426 | ​ | $ | 15,878 |  | $ | 203,304
Less: imputed interest | ​ |  | (22,419) | ​ |  | (2,038) |  | ​ | (24,457)
Total operating lease liabilities | ​ | $ | 165,007 | ​ | $ | 13,840 |  | $ | 178,847
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 56,602 | ​ | $ | 6,060 |  | $ | 62,662
Non-current operating lease liabilities | ​ |  | 108,405 | ​ |  | 7,780 |  | ​ | 116,185
Total operating lease liabilities | ​ | $ | 165,007 | ​ | $ | 13,840 |  | $ | 178,847
​ The following table presents the weighted average remaining lease term and discount rate: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2024 | ​ | 2023
Weighted average remaining lease term |  | 6.3 | years | ​ | 3.1 | years
Weighted average discount rate |  | 7.96 | % | ​ | 8.20 | %
​ The following table presents other information related to our operating leases (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ |  | 2024 |  | 2023
Cash paid for operating lease liabilities | ​ | $ | 18,720 |  | $ | 16,184
Right-of-use assets obtained in exchange for new operating lease liabilities (1) | ​ |  | 203,040 |  | ​ | 6,070
(1) | Our operating lease additions during the three-month period ended March 31, 2024 are primarily related to the charter extensions for the Siem Helix 1, the Siem Helix 2, the Grand Canyon II and the Shelia Bordelon (Note 13). Our operating lease additions during the three-month period ended March 31, 2023 are primarily related to the vessel charter for the Glomar Wave.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//842-20/tableOfContent + Details
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