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Property and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Flight equipment, including pre-delivery deposits $ 2,429,482   $ 2,331,499
Computer hardware and software 154,248   149,727
Land and buildings/leasehold improvements (1) 87,116   87,030
Other property and equipment 82,613   80,601
Total property and equipment 2,753,459   2,648,857
Less accumulated depreciation and amortization 636,841   598,546
Property and equipment, net 2,116,618   2,050,311
Capital Expenditures Incurred but Not yet Paid 5,088 $ 22,106 $ 16,900
Building      
Property, Plant and Equipment [Line Items]      
Carrying Value of Asset Held for Sale, Building $ 4,300