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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 |

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