SCHEDULE I - Parent Company Information - Condensed Statements of Income (Details) - USD ($) $ 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
Spare Parts Sales													25,608	8,917
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
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
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
Parent Company
REVENUE
Lease rent revenue													63,214	50,749	36,593
Maintenance reserve revenue													29,896	22,270	14,046
Spare Parts Sales													20,236	7,588
Gain on sale of leased equipment													2,488	2,147	3,472
Other revenue													7,017	5,227	8,022
Total revenue													122,851	87,981	62,133
EXPENSES
Depreciation expense													40,867	29,555	19,699
Cost Of Spare Parts and Equipment Sales													13,576	6,354
Write-down of equipment													6,764	4,681	4,204
General and administrative													35,898	29,546	29,907
Technical expense													6,805	4,455	5,478
Net finance costs:
Interest expense													18,448	13,500	15,030
Total expenses													122,358	88,091	74,318
Earnings from operations													493	(110)	(12,185)
Earnings from joint ventures													1,175	1,329	3,526
Income (loss) before income taxes													1,668	1,219	(8,659)
Income tax (expense) benefit													2,090	1,708	(4,525)
Equity in income of subsidiaries, net of tax of $199, $3,357, and $8,749 at December 31, 2013, 2012 and 2011, respectively													7,778	7,736	19,760
Net income													$ 7,356	$ 7,247	$ 15,626