Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 5,292	$ 3,985	$ 19,449	$ 11,362
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	16,142	16,628	48,786	49,235
Write-down of equipment	6,958	1,995	22,243	5,924
Stock-based compensation expenses			3,228	2,755
Amortization of deferred costs			3,639	3,231
Allowances and provisions			282	(597)
Gain on sale of leased equipment	(174)	(180)	(4,684)	(3,430)
Gain on debt extinguishment				(137)
Gain on insurance settlement			(1,288)
Income from joint ventures			(6,055)	(874)
Excess tax benefit from stock-based compensation				189
Deferred income taxes			13,367	7,332
Changes in assets and liabilities:
Receivables			(220)	2,094
Spare parts inventory			4,446	1,116
Other assets			(1,692)	(664)
Accounts payable and accrued expenses			(687)	(1,729)
Maintenance reserves			1,706	(9,895)
Security deposits			6,651	(479)
Unearned lease revenue			990	(57)
Net cash provided by operating activities			110,161	65,650
Cash flows from investing activities:
Proceeds from sale of equipment (net of selling expenses)			53,849	61,825
Capital contribution to joint ventures				(5,545)
Distributions received from joint ventures			1,880	1,167
Purchase of equipment held for operating lease			(177,263)	(113,249)
Purchase of maintenance rights				(4,634)
Purchase of property, equipment and furnishings			(493)	(357)
Net cash provided by ( used in) investing activities			(122,027)	(60,793)
Cash flows from financing activities:
Proceeds from issuance of notes payable			485,700	87,000
Debt issuance cost			(7,473)	(3,808)
Interest bearing security deposit			(3,261)
Proceeds from shares issued under stock compensation plans			177	155
Cancellation of restricted stock units in satisfaction of withholding tax			(747)	(866)
Repurchase of common stock			(3,546)	(25,022)
Proceeds from issuance of preferred stock			29,700
Preferred stock dividends, net			(891)
Principal payments on notes payable			(448,237)	(66,204)
Net cash used in financing activities			51,422	(8,745)
Increase (decrease) in cash, cash equivalents and restricted cash			39,556	(3,888)
Cash, cash equivalents and restricted cash at beginning of period			32,374	42,758	$ 42,758
Cash, cash equivalents and restricted cash at end of period	$ 71,930	$ 38,870	71,930	38,870	32,374
Net cash paid for:
Interest			31,932	27,855
Income Taxes			346	137
Supplemental disclosures of non-cash investing activities:
Purchase of aircraft and engines, liability incurred but not paid			2,931		3,089
Engines and equipment, transferred from Held for Operating Lease to Held for Sale but not settled			$ 36,285		$ 9,266
Transfer from property, equipment and furnishings to assets held for lease				$ 2,925