Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Lease rental revenue	$ 777,403	$ 722,694	$ 721,302
Direct financing and sales-type lease revenue	32,295	35,132	25,716
Amortization of lease premiums, discounts and incentives	(22,636)	(15,269)	(11,714)
Total lease revenue	862,049	848,295	791,432
Gain on sale of flight equipment	45,532	36,766	55,167
Total revenues	917,938	890,351	851,787
Operating expenses:
Depreciation	356,021	310,850	298,664
Interest, net	258,070	234,504	241,231
Selling, general and administrative (including non-cash share-based payment expense of $15,830, $11,488 and $13,148, respectively)	77,034	76,025	73,604
Impairment of aircraft	7,404	0	80,430
Maintenance and other costs	24,828	8,961	9,077
Total operating expenses	723,357	630,340	703,006
Other income (expense):
Loss on extinguishment of debt	(7,577)	0	0
Other	(11,864)	1,636	(2,476)
Total other income (expense)	(19,441)	1,636	(2,476)
Income from continuing operations before income taxes and earnings (loss) of unconsolidated equity method investment	175,140	261,647	146,305
Income tax provision	22,667	5,642	6,042
Earnings (loss) of unconsolidated equity method investment, net of tax	4,102	(8,086)	7,611
Net income	$ 156,575	$ 247,919	$ 147,874
Earnings per common share — Basic:
Net income per share (in dollars per share)	$ 2.09	$ 3.18	$ 1.88
Earnings per common share — Diluted:
Net income per share (in dollars per share)	2.06	3.17	1.87
Dividends declared per share (in dollars per share)	$ 1.22	$ 1.14	$ 1.06
Maintenance revenue
Revenues:
Revenue from contract with customer	$ 74,987	$ 105,738	$ 56,128
Other revenue
Revenues:
Revenue from contract with customer	$ 10,357	$ 5,290	$ 5,188