Operating Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013	Dec. 31, 2013
Operating Segments
Number of operating segments	2
Revenue:
Lease rent revenue	$ 26,900	$ 24,487
Maintenance reserve revenue	14,030	9,229
Spare parts sales	79
Gain on sale of leased equipment	309	686
Other revenue	1,682
Total revenue	43,000	35,304
Expenses:
Depreciation and amortization expense	15,710	13,610
General and administrative	9,685	8,269
Net finance costs	9,359	9,227
Other expense	1,815
Total expenses	36,569	32,780
Earnings from operations	6,431	2,524
Total assets	1,192,617		1,199,229
Leasing and Related Operations
Revenue:
Lease rent revenue	26,900
Maintenance reserve revenue	14,030
Gain on sale of leased equipment	309
Other revenue	967
Total revenue	42,206
Expenses:
Depreciation and amortization expense	15,638
General and administrative	9,021
Net finance costs	9,359
Other expense	1,815
Total expenses	35,833
Earnings from operations	6,373
Total assets	1,185,812		1,194,800
Spare Parts Sales
Revenue:
Spare parts sales	79
Other revenue	715
Total revenue	794
Expenses:
Depreciation and amortization expense	72
General and administrative	664
Total expenses	736
Earnings from operations	58
Total assets	$ 6,805		$ 4,429