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Property and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |  |
Flight equipment, including pre-delivery deposits |  | $ 2,474,650 |  | $ 2,331,499
Computer hardware and software |  | 157,334 |  | 149,727
Land and buildings/leasehold improvements (1) |  | 87,657 |  | 87,030
Other property and equipment |  | 97,965 |  | 80,601
Total property and equipment |  | 2,817,606 |  | 2,648,857
Less accumulated depreciation and amortization |  | 669,618 |  | 598,546
Property and equipment, net |  | 2,147,988 |  | $ 2,050,311
Capital Expenditures Incurred but Not yet Paid | $ 16,900 | 12,727 | $ 19,294 |
Building |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Carrying Value of Asset Held for Sale, Building |  | $ 4,300 |  |

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