Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 43,231	$ 62,158	$ 14,069
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	76,814	66,023	66,280
Write-down of equipment	10,651	24,930	9,514
Stock-based compensation expenses	5,410	4,270	3,717
Excess tax benefit from stock-based compensation			236
Amortization of deferred costs	6,403	5,183	4,271
Allowances and provisions	1,503	162	(571)
Gain on sale of leased equipment	(6,944)	(4,929)	(3,482)
Gain on insurance settlement		(1,288)
Income from joint ventures	(3,800)	(7,158)	(1,813)
Loss on disposal of property, equipment and furnishings	(41)
Loss on debt extinguishment			137
Deferred income taxes	12,057	(26,393)	9,099
Changes in assets and liabilities:
Receivables	(5,925)	(2,525)	(2,287)
Distributions received from joint ventures	5,730	1,880	1,167
Spare parts inventory	12,111	(1,855)	(5,093)
Intangibles			(1,511)
Other assets	(3,453)	(970)	(1,707)
Accounts payable and accrued expenses	12,543	1,129	2,330
Maintenance reserves	21,964	7,994	548
Security deposits	3,075	6,246	(4,048)
Unearned lease revenue	(2,642)	2,279	732
Net cash provided by operating activities	188,687	137,136	91,588
Cash flows from investing activities:
Proceeds from sale of equipment (net of selling expenses)	64,429	43,791	62,525
Proceeds from insurance settlement		14,886
Capital contribution to joint ventures			(5,545)
Purchase of equipment held for operating lease	(441,416)	(373,483)	(173,662)
Purchase of maintenance rights			(5,530)
Purchase of property, equipment and furnishings	(3,487)	(10,788)	(1,006)
Net cash used in investing activities	(380,474)	(325,594)	(123,218)
Cash flows from financing activities:
Proceeds from issuance of debt obligations	759,439	686,200	149,000
Debt issuance cost	(7,748)	(8,262)	(3,808)
Principal payments on debt obligations	(504,753)	(496,160)	(113,981)
Interest bearing security deposits		(2,261)	455
Proceeds from shares issued under stock compensation plans	245	177	155
Cancellation of restricted stock units in satisfaction of withholding tax	(1,288)	(1,094)	(1,369)
Repurchase of common stock	(16,135)	(3,546)	(28,958)
Proceeds from the issuance of preferred stock		29,665	19,752
Preferred stock dividends	(3,348)	(1,311)
Net cash provided by financing activities	226,412	203,408	21,246
Increase/(decrease) in cash, cash equivalents and restricted cash	34,625	14,950	(10,384)
Cash, cash equivalents and restricted cash at beginning of period	47,324	32,374	42,758
Cash, cash equivalents and restricted cash at end of period	81,949	47,324	32,374
Net cash paid for:
Interest	59,122	42,817	37,319
Income Taxes	1,073	440	459
Supplemental disclosures of non-cash activities:
Purchase of aircraft and engines	21,656	2,696	5,337
Transfers from Equipment held for operating lease to Equipment held for sale		45,018	28,560
Transfers from Equipment held for sale to Spare parts inventory	26,387	210
Transfers from Equipment held for operating lease to Spare parts inventory	18,220
Transfers from Property, equipment and furnishings to Equipment held for lease			2,925
Accrued preferred stock dividends	686	783	281
Accretion of preferred stock issuance costs	$ 83	$ 46	$ 8