Investments in and Loans to Joint Ventures (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total investments in and loans to joint ventures	$ 28,231		$ 28,231		$ 31,430
Ohio Castings [Member]
Schedule of Equity Method Investments [Line Items]
Total investments in and loans to joint ventures	8,551		8,551		7,378
Results of operations
Revenues	24,717	15,199	60,981	42,481
Gross profit	2,961	1,334	5,896	2,239
Net earnings (loss)	3,085	1,445	4,412	1,096
Axis [Member]
Schedule of Equity Method Investments [Line Items]
Total investments in and loans to joint ventures	19,680		19,680		24,052
Results of operations
Revenues	16,614	15,309	49,690	38,385
Gross profit	(610)	2,002	904	3,461
Income (loss) before interest	(843)	1,789	180	2,770
Net earnings (loss)	$ (2,051)	$ 445	$ (3,523)	$ (1,298)