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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

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