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Segment and Geographic Information (Details 2) (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
Dec. 31, 2010
Revenue composition by market                      
Net sales $ 391,389 $ 404,354 $ 384,693 $ 397,352 $ 391,905 $ 416,493 $ 397,985 $ 396,771 $ 1,577,788 $ 1,603,154 $ 1,455,331
Composite Fibers [Member]
                     
Revenue composition by market                      
Net sales                 436,740 476,029 419,217
Composite Fibers [Member] | Food and beverage [Member]
                     
Revenue composition by market                      
Net sales                 265,423 284,748 242,882
Composite Fibers [Member] | Metallized [Member]
                     
Revenue composition by market                      
Net sales                 87,720 95,276 88,753
Composite Fibers [Member] | Composite laminates [Member]
                     
Revenue composition by market                      
Net sales                 44,613 53,334 50,801
Composite Fibers [Member] | Technical specialties and other [Member]
                     
Revenue composition by market                      
Net sales                 $ 38,984 $ 42,671 $ 36,781