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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials and supplies $ 125,529us-gaap_InventoryRawMaterialsAndSupplies $ 124,103us-gaap_InventoryRawMaterialsAndSupplies
Work in process 27,046us-gaap_InventoryWorkInProcess 29,358us-gaap_InventoryWorkInProcess
Finished products 74,978us-gaap_InventoryFinishedGoods 79,184us-gaap_InventoryFinishedGoods
Inventory reserves (32,816)us-gaap_InventoryValuationReserves (38,879)us-gaap_InventoryValuationReserves
Total Inventory $ 194,737us-gaap_InventoryNet $ 193,766us-gaap_InventoryNet