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Leases (Tables) | 6 Months Ended
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Jun. 30, 2021
Leases [Abstract] |
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,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Operating lease cost | ​ | $ | 14,839 | ​ | $ | 16,106 | ​ | $ | 31,055 |  | $ | 32,429
Variable lease cost | ​ |  | 3,635 | ​ |  | 3,840 | ​ |  | 7,119 |  | ​ | 7,052
Short-term lease cost | ​ |  | 5,243 | ​ |  | 9,992 | ​ |  | 6,975 |  | ​ | 17,166
Sublease income | ​ |  | (329) | ​ |  | (328) | ​ |  | (678) |  | ​ | (607)
Net lease cost | ​ | $ | 23,388 | ​ | $ | 29,610 | ​ | $ | 44,471 |  | $ | 56,040
Schedule of maturities of operating lease liabilities | Maturities of our operating lease liabilities as of June 30, 2021 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 52,106 | ​ | $ | 5,884 |  | $ | 57,990
One to two years | ​ |  | 49,760 | ​ |  | 5,185 |  | ​ | 54,945
Two to three years | ​ |  | 13,557 | ​ |  | 4,722 |  | ​ | 18,279
Three to four years | ​ |  | — | ​ |  | 4,145 |  | ​ | 4,145
Four to five years | ​ |  | — | ​ |  | 1,041 |  | ​ | 1,041
Over five years | ​ |  | — | ​ |  | 4,835 |  | ​ | 4,835
Total lease payments | ​ | $ | 115,423 | ​ | $ | 25,812 |  | $ | 141,235
Less: imputed interest | ​ |  | (9,021) | ​ |  | (4,511) |  | ​ | (13,532)
Total operating lease liabilities | ​ | $ | 106,402 | ​ | $ | 21,301 |  | $ | 127,703
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 45,940 | ​ | $ | 4,829 |  | $ | 50,769
Non-current operating lease liabilities | ​ |  | 60,462 | ​ |  | 16,472 |  | ​ | 76,934
Total operating lease liabilities | ​ | $ | 106,402 | ​ | $ | 21,301 |  | $ | 127,703
​ Maturities of our operating lease liabilities as of December 31, 2020 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Facilities and |  | ​ | ​
​ |  | Vessels |  | Equipment |  | Total
Less than one year | ​ | $ | 54,621 | ​ | $ | 6,028 |  | $ | 60,649
One to two years | ​ |  | 52,106 | ​ |  | 5,435 |  | ​ | 57,541
Two to three years | ​ |  | 34,580 | ​ |  | 4,649 |  | ​ | 39,229
Three to four years | ​ |  | 2,470 | ​ |  | 4,374 |  | ​ | 6,844
Four to five years | ​ |  | — | ​ |  | 2,340 |  | ​ | 2,340
Over five years | ​ |  | — | ​ |  | 4,054 |  | ​ | 4,054
Total lease payments | ​ | $ | 143,777 | ​ | $ | 26,880 |  | $ | 170,657
Less: imputed interest | ​ |  | (13,352) | ​ |  | (4,697) |  | ​ | (18,049)
Total operating lease liabilities | ​ | $ | 130,425 | ​ | $ | 22,183 |  | $ | 152,608
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current operating lease liabilities | ​ | $ | 46,748 | ​ | $ | 4,851 |  | $ | 51,599
Non-current operating lease liabilities | ​ |  | 83,677 | ​ |  | 17,332 |  | ​ | 101,009
Total operating lease liabilities | ​ | $ | 130,425 | ​ | $ | 22,183 |  | $ | 152,608
Schedule of weighted average remaining lease term and discount rate | The following table presents the weighted average remaining lease term and discount rate: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 | ​ | 2020
Weighted average remaining lease term |  | 2.8 | years | ​ | 3.1 | years
Weighted average discount rate |  | 7.51 | % | ​ | 7.53 | %
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,
​ |  | 2021 |  | 2020
Cash paid for operating lease liabilities | ​ | $ | 31,562 |  | $ | 32,731
ROU assets obtained in exchange for new operating lease obligations | ​ |  | 1,500 |  | ​ | —

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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