Investments in and Loans to Joint Ventures (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Ohio Castings [Member]
Financial position:
Current assets	$ 14,589	$ 21,607
Non-current assets	9,921	9,085
Total assets	24,510	30,692
Current liabilities	4,261	5,673
Members’ equity (deficit)	20,249	25,019
Total liabilities and members’ deficit	24,510	30,692
Axis [Member]
Financial position:
Current assets	8,009	7,510
Non-current assets	31,494	33,838
Total assets	39,503	41,348
Current liabilities	14,544	17,356
Non-current liabilities	35,439	47,253
Total liabilities	49,983	64,609
Members’ equity (deficit)	(10,480)	(23,261)
Total liabilities and members’ deficit	$ 39,503	$ 41,348