Property, Plant, Equiment and Railcars on Lease, net (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Total depreciation expense	$ 45,729	$ 34,212	$ 27,712
Depreciation expense on leased railcars	$ 26,163	$ 16,454	$ 9,799