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Investments in and Loans to Joint Ventures (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Income (Loss) from Equity Method Investments $ 535 $ 796 $ 1,878 $ 1,346  
Axis Credit Agreement [Member]          
Schedule of Equity Method Investments [Line Items]          
Interest rate 7.75% 7.75% 7.75% 7.75%  
Balance outstanding on loans $ 8,900   $ 8,900   $ 11,800
Ohio Castings [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest held in joint venture 33.30%   33.30%    
Axis [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of interest held in joint venture 41.90%   41.90%    
Minority partner in joint venture 9.70%   9.70%    
Other significant partner in joint venture 48.40%   48.40%