Leases and Prepaid Maintenance Deposits - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Capital Leases
2014	$ 1,200
2015	1,200
2016	1,000
2017	0
2018	0
2019 and thereafter	0
Total minimum lease payments	3,400
Less amount representing interest	366
Present value of minimum lease payments	3,034
Less current portion	1,400
Long term portion	1,634
Operating Leases
2014	202,666
2015	201,002
2016	194,594
2017	172,468
2018	146,185
2019 and thereafter	526,508
Total minimum lease payments	1,443,423
Aircraft and Spare Engine Leases
Operating Leases
2014	184,131
2015	184,694
2016	182,984
2017	163,673
2018	139,740
2019 and thereafter	502,102
Total minimum lease payments	1,357,324
Property Facility Leases
Operating Leases
2014	18,535
2015	16,308
2016	11,610
2017	8,795
2018	6,445
2019 and thereafter	24,406
Total minimum lease payments	$ 86,099