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v3.20.4

Leases (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Retained earnings |  | $ 2,052,006 | $ 2,079,179
Operating lease right-of-use assets |  | 282,362 | 336,009
Current maturities of lease liabilities |  | 82,641 | 94,806
Noncurrent operating leases |  | 205,845 | 259,237
Operating leases |  | $ 90,300 |
Weighted-average remaining lease term for operating leases |  | 6 years 6 months |
Weighted-average discount rate for operating leases |  | 6.10% |
Lease costs |  |  |
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
Aircraft |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft acquired | aircraft |  | 41 |
Impairment charges | $ 13,100 |  |
Aircraft | Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 1 year |
Aircraft | Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 10 years |
Airport Facilities | Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 1 month |
Airport Facilities | Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease term |  | 36 years |

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