Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 5,990	$ 3,366	$ 14,158	$ 7,377
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	16,015	16,188	32,644	32,607
Write-down of equipment	2,277	1,893	15,285	3,929
Stock-based compensation expenses			2,074	1,849
Amortization of deferred costs			2,361	2,157
Allowances and provisions			272	(419)
Gain on sale of leased equipment	(3,527)	(258)	(4,509)	(3,250)
Gain on debt extinguishment		(137)		(137)
Income from joint ventures			(3,015)	(243)
Excess tax benefit from stock-based compensation				254
Deferred income taxes			10,406	4,990
Changes in assets and liabilities:
Receivables			3,345	(225)
Spare parts inventory			645	1,799
Other assets			(3,315)	297
Accounts payable and accrued expenses			8,139	(2,322)
Maintenance reserves			(342)	(1,782)
Security deposits			1,757	(105)
Unearned lease revenue			(628)	(256)
Net cash provided by operating activities			79,277	46,794
Cash flows from investing activities:
Proceeds from sale of equipment (net of selling expenses)			37,754	54,204
Capital contribution to joint ventures				(4,610)
Distributions received from joint ventures			1,880	1,167
Purchase of equipment held for operating lease			(112,233)	(61,472)
Purchase of maintenance rights				(4,634)
Purchase of property, equipment and furnishings			(326)	(183)
Net cash provided by ( used in) investing activities			(72,925)	(15,528)
Cash flows from financing activities:
Proceeds from issuance of notes payable			93,000	55,000
Debt issuance cost				(3,755)
Proceeds from shares issued under stock compensation plans			93	82
Cancellation of restricted stock units in satisfaction of withholding tax			(622)	(581)
Repurchase of common stock			(3,348)	(22,399)
Preferred stock dividends, net			(596)
Principal payments on notes payable			(72,752)	(42,501)
Net cash used in financing activities			15,775	(14,154)
Increase (decrease) in cash, cash equivalents and restricted cash			22,127	17,112
Cash, cash equivalents and restricted cash at beginning of period			32,373	42,758	$ 42,758
Cash, cash equivalents and restricted cash at end of period	$ 54,500	$ 59,870	54,500	59,870	32,373
Net cash paid for:
Interest			19,426	18,653
Income Taxes			332	72
Supplemental disclosures of non-cash investing activities:
Purchase of aircraft and engines, liability incurred but not paid			1,624		2,565
Engines and equipment, transferred from Held for Operating Lease to Held for Sale but not settled			$ 27,408		$ 18,371
Transfer from property, equipment and furnishings to assets held for lease				$ 2,925