Property, Plant, Equiment and Railcars on Lease, net (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Total depreciation expense	$ 27,712	$ 23,850	$ 22,167
Depreciation expense on leased railcars	$ 9,799	$ 4,424	$ 505