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Property and Equipment (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Flight equipment, including pre-delivery deposits | $ 2,312,146 |  | $ 2,289,157
Computer hardware and software | 147,688 |  | 171,516
Land and buildings/leasehold improvements | 82,071 |  | 98,885
Other property and equipment | 81,571 |  | 161,760
Total property and equipment | 2,623,476 |  | 2,721,318
Less accumulated depreciation and amortization | 547,028 |  | 484,510
Property and equipment, net | 2,076,448 |  | 2,236,808
Capital Expenditures Incurred but Not yet Paid | $ 22,106 | $ 6,043 | $ 16,500

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