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Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) aircraft	Dec. 31, 2018 USD ($) aircraft	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2016 USD ($)
Summary of Significant Accounting Policies
Number of aircraft owned | aircraft	292
Number of aircraft on order with manufacturers | aircraft	413
Number of aircraft purchase options with manufacturers | aircraft	70
Cash, cash equivalents and restricted cash
Cash and cash equivalents	$ 317,488	$ 300,127
Restricted cash	20,573	22,871
Total cash, cash equivalents and restricted cash in the consolidated statements of cash flows	$ 338,061	322,998	$ 308,282		$ 290,802
Flight equipment
Useful life	25 years
Residual value (as a percent)	15.00%
Maintenance Rights
Maintenance right liabilities	$ 0
Payments for Flight Equipment	$ 3,663,605	$ 2,512,582	$ 1,972,009
Income taxes
Probability threshold of realization of full value of the asset for recording of valuation allowance for deferred tax assets (as a percent)	50.00%
Blackbird I
Investments
Percentage of equity ownership	9.50%
Blackbird II
Investments
Percentage of equity ownership	9.50%
Thunderbolt II
Investments
Noncontrolling Interest, Ownership Percentage by Parent	5.00%
Assets Leased to Others
Maintenance Rights
Number of aircraft purchased | aircraft	0	2
Total cost		$ 73,300
Aircraft Improvement Assets
Maintenance Rights
Number of aircraft purchased | aircraft	2	9
Maintenance Right Assets
Maintenance Rights
Accumulated depreciation	$ 37,200	$ 46,400
Total cost		$ 13,200
ASU 2016-02
Investments
Operating ROU lease assets				$ 44,600
Lease obligations				$ 51,200

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