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Investments in and Loans to Joint Ventures (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Income (Loss) from Equity Method Investments $ 1,486 $ 1,797  
Axis Credit Agreement [Member]      
Schedule of Equity Method Investments [Line Items]      
Interest rate 7.75% 7.75%  
Balance outstanding on loans $ 22,100   $ 23,600
Ohio Castings [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest held in joint venture 33.30%    
Axis [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest held in joint venture 41.90%    
Minority partner in joint venture 9.70%    
Other significant partner in joint venture 48.40%