Investments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Jun. 03, 2014	May 25, 2011
Investments
Investment in WMES joint ventures at beginning of the period		$ 45,406
Investment			$ 4,610
Earnings from joint venture		1,854
Distribution		(1,880)
Foreign Currency Translation Adjustment		99
Investment in WMES joint ventures at end of the period		44,540
Deferred gain on engine sale		(939)
Property Subject to or Available for Operating Lease, Net				$ 1,094,673	$ 1,136,603
Equity Method Investments		45,406		$ 44,540	45,406
Sale of engines		26,711	52,488
Gain (Loss) on Sale of Leased Equipment
Investments
Gain on sale of equipemnt		900
WMES
Investments
Ownership interest (as a percent)				100.00%			50.00%
Investment in WMES joint ventures at beginning of the period		32,470
Earnings from joint venture		1,635
Distribution		(1,880)
Investment in WMES joint ventures at end of the period		31,782
Deferred gain on engine sale		(443)
Equity Method Investments		$ 32,470		$ 31,782	32,470
Sale of engines			46,100
Amortized Gain Period		15 years
Amortized Gain Residual Value Percent		55.00%
Consolidated Statements of Income
Revenue		$ 11,661	9,246
Expenses		8,430	9,180
WMES net income		3,231	66
Consolidated Balance Sheets
Total assets				273,121	293,299
Total liabilities				200,265	219,881
Total WMES net equity				72,856	73,418
WMES | Other Revenue
Investments
Management fees		800	600
WMES | Gain (Loss) on Sale of Leased Equipment
Investments
Gain on sale of equipemnt			$ 1,200
CASC
Investments
Ownership interest (as a percent)						50.00%
Investment in WMES joint ventures at beginning of the period		12,936
Investment	$ 15,000
Earnings from joint venture		219
Foreign Currency Translation Adjustment		99
Investment in WMES joint ventures at end of the period		12,758
Deferred gain on engine sale		(496)
Equity Method Investments		$ 12,936		$ 12,758	$ 12,936