Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Deferred revenue	$ 3,057	$ 3,381
Nondeductible accruals	20,547	11,056
Deferred manufacturing credits	910	822
Accrued maintenance	1,854	830
Equity compensation	3,882	4,485
Other	4,026	2,751
Deferred tax assets	34,276	23,325
Deferred tax liabilities:
Capitalized interest	0	286
Deferred gain (loss) on leases, net	2,435	2,393
Accrued rent	14,025	6,724
Prepaid expenses	1,217	2,151
Property, plant and equipment	278,872	168,813
Deferred financing costs	5,358	0
Accrued aircraft and engine maintenance	40,512	64,439
Deferred tax liabilities	342,419	244,806
Net deferred tax assets (liabilities)	$ (308,143)	$ (221,481)