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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Inventory Disclosure [Abstract]    
Finished goods $ 121,984 $ 127,254
Work-in-process 60,557 57,784
Raw material and supplies 33,979 31,344
Inventories $ 216,520 $ 216,382