Investments in and Loans to Joint Ventures (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Ohio Castings [Member]
Results of operations
Revenues	$ 74,113	$ 83,872	$ 55,497
Gross profit	4,787	8,277	2,993
Equity Method Investment, Net Income (Loss)	1,230	5,906	1,115
Axis [Member]
Results of operations
Revenues	70,289	69,667	53,944
Gross profit	17,961	5,496	5,645
Income (loss) before interest	16,972	4,496	4,724
Equity Method Investment, Net Income (Loss)	$ 12,782	$ (390)	(652)
Amtek Railcar [Member]
Results of operations
Equity Method Investment, Net Income (Loss)			$ (5,600)