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Leases, Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2019
Summary of related terms and discount rates | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ ​ | September 30, 2019
Weighted-average remaining lease term |  | ​ |
Operating leases | ​ | ​ | 6.75 years | ​
Weighted-average discount rate | ​ |  | ​ | ​
Operating leases | ​ | ​ | 6.4% | ​
Summary of lease costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30,
​ |  | 2019 |  | 2018
Operating lease cost |  | $ | 25,173 |  | $ | 42,286
Variable and short-term lease cost | ​ |  | 1,343 | ​ |  | 1,184
Sublease income | ​ | ​ | (357) | ​ | ​ | —
Total lease cost |  | $ | 26,159 |  | $ | 43,470
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the nine months ended September 30,
​ |  | 2019 |  | 2018
Operating lease cost |  | $ | 80,041 |  | $ | 140,544
Variable and short-term lease cost | ​ |  | 4,164 | ​ |  | 3,996
Sublease income | ​ | ​ | (357) | ​ | ​ | —
Total lease cost |  | $ | 83,848 |  | $ | 144,540
​ ​
Schedule of future minimum rental payments for operating leases | ​
​ | ​ | ​ | ​ | ​
October 2019 through December 2019 |  | $ | 17,603 |
2020 | ​ |  | 91,892 | ​
2021 | ​ |  | 80,540 | ​
2022 | ​ |  | 70,900 | ​
2023 | ​ |  | 65,521 | ​
Thereafter | ​ |  | 103,819 | ​
​ | ​ | $ | 430,275 | ​
Summary of commitments and obligations | The following table summarizes the Company’s commitments and obligations as noted for each of the next five years and thereafter (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Total |  | Oct - Dec 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
Operating lease payments for aircraft and facility obligations | ​ | $ | 430,275 | ​ | $ | 17,603 | ​ | $ | 91,892 | ​ | $ | 80,540 | ​ | $ | 70,900 | ​ | $ | 65,521 | ​ | $ | 103,819 |
Firm aircraft and spare engine commitments |  | ​ | 365,794 | ​ | ​ | 167,037 | ​ | ​ | 187,757 | ​ | ​ | 11,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Interest commitments (1) |  | ​ | 582,997 | ​ | ​ | 31,628 | ​ | ​ | 116,550 | ​ | ​ | 101,468 | ​ | ​ | 87,294 | ​ | ​ | 71,252 | ​ | ​ | 174,805 | ​
Principal maturities on long-term debt |  | ​ | 3,008,588 | ​ | ​ | 91,192 | ​ | ​ | 361,131 | ​ | ​ | 344,937 | ​ | ​ | 358,586 | ​ | ​ | 367,322 | ​ | ​ | 1,485,420 | ​
Total commitments and obligations | ​ | $ | 4,387,654 | ​ | $ | 307,460 | ​ | $ | 757,330 | ​ | $ | 537,945 | ​ | $ | 516,780 | ​ | $ | 504,095 | ​ | $ | 1,764,044 | ​
​
(1) | At September 30, 2019, the Company had variable rate notes representing only 0.1% of its total long-term debt.
Previously reported |
Schedule of future minimum rental payments for operating leases | The following table summarizes future minimum rental payments required under operating leases that have non-cancelable lease terms in excess of one year as of December 31, 2018 (in thousands): ​
​ | ​ | ​ | ​ | ​
2019 |  | $ | 87,256 |
2020 | ​ |  | 101,741 | ​
2021 | ​ |  | 90,787 | ​
2022 | ​ |  | 72,593 | ​
2023 | ​ |  | 65,749 | ​
Thereafter | ​ |  | 59,820 | ​
​ | ​ | $ | 477,946 | ​

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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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=77888426&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=77888426&loc=SL77918701-209980 + Details
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