Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 62,158	$ 14,069	$ 6,460
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	66,023	66,280	69,424
Write-down of equipment	24,930	9,514	9,181
Stock-based compensation expenses	4,270	3,717	4,150
Excess tax benefit from stock-based compensation		236	26
Amortization of deferred costs	5,183	4,271	4,307
Allowances and provisions	162	(571)	697
Gain on sale of leased equipment	(4,929)	(3,482)	(8,320)
Gain on insurance settlement	(1,288)
Income from joint ventures	(7,158)	(1,813)	(1,175)
Loss (gain) on debt extinguishment		137	(1,151)
Deferred income taxes	(26,393)	9,100	6,027
Changes in assets and liabilities:
Receivables	(2,525)	(2,287)	(5,769)
Spare parts inventory	(1,855)	(5,093)	3,828
Intangibles		(1,511)
Other assets	(970)	(1,707)	(2,635)
Accounts payable and accrued expenses	1,129	2,329	1,677
Maintenance reserves	7,994	548	4,580
Security deposits	6,246	(4,048)	5,747
Unearned lease revenue	2,279	732	748
Net cash provided by operating activities	135,256	90,421	97,802
Cash flows from investing activities:
Proceeds from sale of equipment (net of selling expenses)	43,791	62,525	41,608
Proceeds from insurance settlement	14,886
Capital contribution to joint ventures		(5,545)	(630)
Distributions received from joint ventures	1,880	1,167	1,304
Maintenance rights payments received			5,802
Purchase of equipment held for operating lease and for sale	(373,483)	(173,662)	(174,772)
Purchase of maintenance rights		(5,530)	(8,844)
Purchase of property, equipment and furnishings	(10,788)	(1,006)	(3,988)
Net cash used in investing activities	(323,714)	(122,051)	(139,520)
Cash flows from financing activities:
Proceeds from issuance of notes payable	686,200	149,000	192,700
Debt issuance cost	(8,262)	(3,808)	(13)
Principal payments on notes payable	(496,160)	(113,981)	(153,816)
Interest bearing security deposit	(2,261)	455	(1,606)
Proceeds from shares issued under stock compensation plans	177	155	518
Repurchase of common stock	(3,546)	(28,958)	(16,500)
Proceeds from issuance of preferred stock	29,665	19,752
Preferred stock dividends	(1,311)
Cancellation of restricted stock units in satisfaction of withholding tax	(1,094)	(1,369)	(1,558)
Net cash used in financing activities	203,408	21,246	19,725
Increase/(decrease) in cash, cash equivalents and restricted cash	14,950	(10,384)	(21,993)
Cash, cash equivalents and restricted cash at beginning of period	32,374	42,758	64,751
Cash, cash equivalents and restricted cash at end of period	47,324	32,374	42,758
Net cash paid for:
Interest	42,817	37,319	35,568
Income Taxes	440	459	353
Supplemental disclosures of non-cash investing activities:
Purchase of aircraft and engines	2,696	5,337	4,662
Transfers from Equipment held for operating lease to Equipment held for sale	45,018	28,560	22,079
Transfers from Equipment held for sale to Spare parts inventory	210		$ 6,061
Transfers from Property, equipment and furnishings to Equipment held for lease		2,925
Accrued preferred stock dividends	783	281
Accretion of preferred stock issuance costs	$ 46	$ 8