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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal		$ 38,520
State		1,025	$ 492	$ 380
Foreign		2,937	2,839	3,853
Deferred:
Federal		91,243	125,160	(150,850)
State		14,839	812	(5)
Income tax expense/(benefit)		148,564	129,303	(146,622)
Differences between the provision for income taxes and income taxes at the federal statutory income tax rate
Income taxes at statutory federal rate		154,494	134,429	213,336
Impact of tax legislation				(354,127)
Foreign tax credit		(18,231)	(9,600)	(10,873)
State income taxes, net of federal income tax effect and other		12,532	1,030	228
Other		(231)	3,444	4,814
Income tax expense/(benefit)		$ 148,564	$ 129,303	$ (146,622)
Differences between effective tax rate and federal statutory income tax rate
Income taxes at statutory federal rate (as a percent)		21.00%	21.00%	35.00%
Impact of tax legislation (as a percent)				(58.10%)
Foreign tax credit (as a percent)		(2.50%)	(1.50%)	(1.80%)
State income taxes, net of federal income tax effect and other (as a percent)		1.70%	0.20%
Other			0.50%	0.90%
Income tax expense/(benefit) (as a percent)		20.20%	20.20%	(24.00%)
Assets (Liabilities)
Equity compensation		$ 8,711	$ 11,951
Net operating losses			17
Foreign tax credit			2,425
Rents received in advance		28,161	25,165
Accrued bonus		3,244	2,825
Straight-line rents			(320)
Straight-line rents		434
Other		(1,316)	1,972
Aircraft depreciation		(788,729)	(687,802)
Net deferred tax assets/(liabilities)		(749,495)	(643,767)
Other disclosures
Cumulative effect of adjustment upon adoption of ASU 2016-09				$ 458
Benefit related to Foreign tax credit		18,231	9,600	$ 10,873
State
Assets (Liabilities)
Net operating loss carry-forwards (NOLs)		$ 200	$ 2,400
Accounting Standards Update 2016 - 09
Other disclosures
Cumulative effect of adjustment upon adoption of ASU 2016-09	$ 500

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