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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 97,732us-gaap_InventoryRawMaterialsNetOfReserves $ 81,338us-gaap_InventoryRawMaterialsNetOfReserves
In-process products 19,496us-gaap_InventoryWorkInProcessNetOfReserves 18,475us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 99,317us-gaap_InventoryFinishedGoodsNetOfReserves 97,915us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 216,545us-gaap_InventoryNet $ 197,728us-gaap_InventoryNet