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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials and supplies $ 121,573 $ 119,550
Work in process 29,725 31,085
Finished products 81,536 89,334
Inventory reserves 41,967 35,211
Total Inventory $ 190,867 $ 204,758