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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory [Abstract]    
Finished goods $ 49,067 $ 49,235
Work in process 45,945 44,866
Raw material and supplies 26,020 25,082
Total inventories $ 121,032 $ 119,183