Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Operating lease payments for aircraft and facility obligations
Total	$ 600,554
March - 2018	85,825
2019	85,563
2020	101,523
2021	93,118
2022	75,178
Therafter	159,347
Firm aircraft and spare engine commitments
Total	979,269
March - 2018	861,041
2019	21,200
2020	10,600
2021	86,428
Interest commitments
Total	538,046
March - 2018	81,995
2019	98,247
2020	84,169
2021	71,193
2022	59,263
Therafter	143,179
Principal maturities on long-term debt
Total	2,801,208	$ 2,712,350
March - 2018	250,739
2019	340,546
2020	311,261
2021	299,704
2022	289,786
Thereafter	1,309,172
Total commitments and obligations
Total	4,919,077
March - 2018	1,279,600
2019	545,556
2020	507,553
2021	550,443
2022	424,227
Therafter	$ 1,611,698
Variable interest rate (as percent)	2.20%

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