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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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Computer Hardware and Software

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Land and buildings/leasehold improvements

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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