Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Lease rental revenue	$ 721,302	$ 725,220	$ 733,417
Finance and sales-type lease revenue	25,716	17,190	7,658
Amortization of lease premiums, discounts and incentives	(11,714)	(10,353)	(10,664)
Maintenance revenue	56,128	33,590	71,049
Total lease rentals	791,432	765,647	801,460
Other revenue	5,188	7,311	17,742
Total revenues	796,620	772,958	819,202
Expenses:
Depreciation	298,664	305,216	318,783
Interest, net	241,231	255,660	243,577
Selling, general and administrative (including non-cash share-based payment expense of $13,148, $7,901 and $5,537, respectively)	73,604	61,872	56,198
Impairment of aircraft	80,430	28,585	119,835
Maintenance and other costs	9,077	7,773	11,502
Total expenses	703,006	659,106	749,895
Other income (expense):
Gain on sale of flight equipment	55,167	39,126	58,017
Other	(2,476)	3,527	919
Total other income	52,691	42,653	58,936
Income from continuing operations before income taxes and earnings of unconsolidated equity method investment	146,305	156,505	128,243
Income tax provision	6,042	12,307	12,771
Earnings of unconsolidated equity method investment, net of tax	7,611	7,255	6,257
Net income	$ 147,874	$ 151,453	$ 121,729
Earnings per common share — Basic:
Net income per share (in dollars per share)	$ 1.88	$ 1.92	$ 1.50
Earnings per common share — Diluted:
Net income per share (in dollars per share)	1.87	1.92	1.50
Dividends declared per share (in dollars per share)	$ 1.06	$ 0.98	$ 0.90