Investments in and Loans to Joint Ventures (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Ohio Castings [Member]
Results of operations
Revenues	$ 12,794	$ 23,399	$ 27,282	$ 46,685
Gross profit (loss)	515	2,278	905	4,556
Net income (loss)	(116)	2,428	(349)	4,948
Axis [Member]
Results of operations
Revenues	12,134	16,931	23,076	34,118
Gross profit (loss)	1,302	1,467	1,459	2,891
Income (loss) before interest and taxes	1,056	1,254	981	2,413
Net income (loss)	(300)	(206)	(1,743)	(529)
Amtek Railcar [Member]
Results of operations
Revenues	95	0	95	0
Gross profit (loss)	(17)	0	(17)	0
Income (loss) before interest and taxes	(238)	(435)	(762)	(934)
Net income (loss)	$ (1,375)	$ (435)	$ (1,942)	$ (952)