Investments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2014	Mar. 31, 2016	Mar. 31, 2015	Jun. 03, 2014
Investments
Capital contribution to joint ventures		$ (4,610)	$ (630)
Investment in WMES joint ventures at beginning of the period		41,295
Capital contribution		4,610	630
Earnings from joint venture		187
Deferred gain on engine sale		(1,212)
Distribution		(1,167)
Foreign currency translation adjustment		(441)
Investment in WMES joint ventures at end of the period		43,272
Management fees		$ 600	$ 400
WMES
Investments
Ownership interest (as a percent)		100.00%	50.00%
Capital contribution to joint ventures		$ (4,610)
Investment in WMES joint ventures at beginning of the period		27,272
Capital contribution		4,610
Earnings from joint venture		60
Deferred gain on engine sale		(1,212)
Distribution		(1,167)
Investment in WMES joint ventures at end of the period		29,563
Gain on sale of equipemnt		$ 1,200
Amortized Gain Period		15 years
Amortized Gain Residual Value Percent		55.00%
Consolidated Statements of Income
Revenue		$ 9,246	$ 6,398
Expenses		9,180	5,727
WMES net income		66	671
Consolidated Balance Sheets
Total assets		299,746	256,126
Total liabilities		231,927	195,258
Total WMES net equity		67,819	$ 60,868
CASC
Investments
Ownership interest (as a percent)				50.00%
Capital contribution to joint ventures	$ 15,000
Investment in WMES joint ventures at beginning of the period		14,023
Capital contribution	$ (15,000)
Earnings from joint venture		127
Foreign currency translation adjustment		(441)
Investment in WMES joint ventures at end of the period		$ 13,709