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Foreign Operations (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
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales | $ 35,696 | $ 37,681 | $ 44,544 | $ 44,529 | $ 41,302 | $ 37,836 | $ 35,294 | $ 28,989 | $ 162,450 | $ 143,421
Property, plant and equipment — net | 51,558 |  |  |  | 49,344 |  |  |  | 51,558 | 49,344
United States |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 117,739 | 109,213
Property, plant and equipment — net | 17,508 |  |  |  | 19,623 |  |  |  | 17,508 | 19,623
Mexico |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 43,358 | 30,180
Property, plant and equipment — net | 34,050 |  |  |  | 29,721 |  |  |  | 34,050 | 29,721
Canada |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 1,353 | 4,028
CoreComposites de Mexico, S. de R.L. de C.V. |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 74,667 | $ 68,008
Expenses as a percentage of revenues |  |  |  |  |  |  |  |  | 20.00% | 23.00%

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