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Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Major customers:                    
Total product sales $ 32,009 $ 32,149 $ 41,209 $ 44,331 $ 39,151 $ 37,173 $ 33,547 $ 28,974 $ 149,698 $ 138,845
Total tooling sales 3,687 5,532 3,335 198 2,151 663 1,747 15 12,752 4,576
Total net sales 35,696 37,681 44,544 44,529 41,302 37,836 35,294 28,989 162,450 143,421
Navistar
                    
Major customers:                    
Total net sales                 63,303 63,182
Paccar
                    
Major customers:                    
Total net sales                 57,252 51,413
Other customers
                    
Major customers:                    
Total net sales                 41,895 28,826
Product sales | Navistar
                    
Major customers:                    
Total net sales                 55,002 61,978
Product sales | Paccar
                    
Major customers:                    
Total net sales                 55,524 49,163
Product sales | Other customers
                    
Major customers:                    
Total net sales                 39,172 27,704
Tooling sales | Navistar
                    
Major customers:                    
Total net sales                 8,301 1,204
Tooling sales | Paccar
                    
Major customers:                    
Total net sales                 1,728 2,250
Tooling sales | Other customers
                    
Major customers:                    
Total net sales                 $ 2,723 $ 1,122
Customer concentration risk
                    
Major customers:                    
Number of major customers                 2 2