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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%