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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases |
Summary of related terms and discount rates | The table below presents lease related terms and discount rates as of December 31, 2020. ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ ​ | As of December 31, 2020
Weighted-average remaining lease term |  | ​ |
Operating leases | ​ | ​ | 6.50 years | ​
Weighted-average discount rate | ​ |  | ​ | ​
Operating leases | ​ | ​ | 6.1% | ​
Summary of lease costs | The Company’s lease costs for 2020 and 2019 included the following components (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31,
​ |  | 2020 |  | 2019
Operating lease cost |  | $ | 94,915 |  | $ | 104,011
Variable and short-term lease cost | ​ |  | 4,619 | ​ |  | 5,232
Sublease income | ​ | ​ | (6,304) | ​ | ​ | (1,436)
Total lease cost |  | $ | 93,230 |  | $ | 107,807
Schedule of future minimum rental payments for operating leases | The following table summarizes future minimum rental payments primarily related to leased aircraft required under operating leases that had initial or remaining non-cancelable lease terms as of December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​
2021 |  | $ | 85,869 |
2022 | ​ |  | 77,780 | ​
2023 | ​ |  | 69,530 | ​
2024 | ​ |  | 28,091 | ​
2025 | ​ |  | 15,751 | ​
Thereafter | ​ |  | 82,719 | ​
​ | ​ | $ | 359,740 | ​

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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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