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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Inventory Disclosure [Abstract]      
Raw materials $ 84,040us-gaap_InventoryRawMaterialsNetOfReserves $ 97,732us-gaap_InventoryRawMaterialsNetOfReserves $ 92,671us-gaap_InventoryRawMaterialsNetOfReserves
In-process products 20,262us-gaap_InventoryWorkInProcessNetOfReserves 19,496us-gaap_InventoryWorkInProcessNetOfReserves 19,822us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 101,010us-gaap_InventoryFinishedGoodsNetOfReserves 99,317us-gaap_InventoryFinishedGoodsNetOfReserves 104,036us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 205,312us-gaap_InventoryNet $ 216,545us-gaap_InventoryNet $ 216,529us-gaap_InventoryNet