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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials and supplies $ 94,521us-gaap_InventoryRawMaterials $ 94,437us-gaap_InventoryRawMaterials
Work in process 43,628us-gaap_InventoryWorkInProcess 35,631us-gaap_InventoryWorkInProcess
Finished goods 93,086us-gaap_InventoryFinishedGoods 85,657us-gaap_InventoryFinishedGoods
Inventories, net 231,235us-gaap_InventoryNet 215,725us-gaap_InventoryNet
Inventory Valuation Reserves $ 4,788us-gaap_InventoryValuationReserves $ 5,233us-gaap_InventoryValuationReserves