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Property and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Capital Expenditures Incurred but Not yet Paid | $ 46,500 | $ 16,500
Flight equipment, including pre-delivery deposits | 2,397,141 | 2,289,157
Computer hardware and software | 153,842 | 171,516
Land and buildings/leasehold improvements | 81,954 | 98,885
Other property and equipment | 80,816 | 161,760
Total property and equipment | 2,713,753 | 2,721,318
Less accumulated depreciation and amortization | 503,032 | 484,510
Property and equipment, net | $ 2,210,721 | $ 2,236,808

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