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Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Major customers:                    
Total product sales $ 36,750 $ 32,342 $ 32,146 $ 32,858 $ 32,009 $ 32,149 $ 41,209 $ 44,331 $ 134,096 $ 149,698
Total tooling sales 898 5,092 2,535 1,504 3,687 5,532 3,335 198 10,029 12,752
Total net sales 37,648 37,434 34,681 34,362 35,696 37,681 44,544 44,529 144,125 162,450
Navistar
                    
Major customers:                    
Total net sales                 47,356 63,303
Paccar
                    
Major customers:                    
Total net sales                 50,154 57,252
Other customers
                    
Major customers:                    
Total net sales                 46,615 41,895
Product sales | Navistar
                    
Major customers:                    
Total net sales                 46,384 55,002
Product sales | Paccar
                    
Major customers:                    
Total net sales                 42,784 55,524
Product sales | Other customers
                    
Major customers:                    
Total net sales                 44,928 39,172
Tooling sales | Navistar
                    
Major customers:                    
Total net sales                 972 8,301
Tooling sales | Paccar
                    
Major customers:                    
Total net sales                 7,370 1,728
Tooling sales | Other customers
                    
Major customers:                    
Total net sales                 $ 1,687 $ 2,723
Customer concentration risk
                    
Major customers:                    
Number of major customers, Sales                 2