Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUE
Lease rent revenue													$ 107,866	$ 101,748	$ 101,737
Maintenance reserve revenue													55,064	53,363	46,694
Gain on sale of leased equipment													8,354	5,753	5,675
Other revenue													2,718	4,506	4,306
Total revenue	$ 55,195	$ 57,758	$ 43,843	$ 42,814	$ 41,563	$ 45,519	$ 43,865	$ 43,340	$ 47,203	$ 37,952	$ 37,953	$ 35,304	199,610	174,287	158,412
EXPENSES
Depreciation and amortization expense													69,586	65,441	58,727
Cost Of Spare Parts and Equipment Sales													17,866	7,474
Write-down of equipment													9,181	5,602	6,461
General and administrative													42,744	35,859	33,868
Technical expense													9,403	12,336	12,863
Net finance costs:
Interest expense													39,012	37,062	38,719
Gain on debt extinguishment													(1,151)
Total net finance costs													37,861	37,062	38,719
Total expenses													186,641	163,774	150,638
Earnings from operations													12,969	10,513	7,774
Earnings from joint ventures													1,175	1,329	3,526
Income (loss) before income taxes													14,144	11,842	11,300
Income tax expense (benefit)													6,788	4,595	(4,326)
Net income	$ 2,973	$ 2,577	$ (492)	$ 2,298	$ (277)	$ 979	$ 2,214	$ 4,331	$ 6,553	$ (2,229)	$ 9,692	$ 1,610	$ 7,356	$ 7,247	$ 15,626
Basic earnings per common share: (in dollars per share)	$ 0.38	$ 0.33	$ (0.06)	$ 0.29	$ (0.03)	$ 0.12	$ 0.28	$ 0.55	$ 0.84	$ (0.29)	$ 1.20	$ 0.20	$ 0.94	$ 0.92	$ 1.95
Diluted earnings per common share: (in dollars per share)	$ 0.37	$ 0.32	$ (0.06)	$ 0.29	$ (0.03)	$ 0.12	$ 0.27	$ 0.53	$ 0.81	$ (0.28)	$ 1.17	$ 0.19	$ 0.92	$ 0.89	$ 1.89
Average common shares outstanding (in shares)	7,739	7,839	7,841	7,848	7,839	7,938	7,976	7,914	7,846	8,126	8,106	8,033	7,811	7,917	8,029
Diluted average common shares outstanding (in shares)	7,872	7,963	7,991	8,044	8,037	8,123	8,179	8,129	8,084	8,329	8,303	8,273	7,982	8,141	8,289