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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventories    
Raw materials and supplies $ 130,481 $ 127,525
Work in process 32,650 30,498
Finished products 90,056 90,352
Inventory reserves (43,804) (43,452)
Total Inventory $ 209,383 $ 204,923