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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 81,508us-gaap_InventoryRawMaterialsNetOfReserves $ 73,564us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-progress 45,010us-gaap_InventoryWorkInProcessNetOfReserves 42,417us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 60,861us-gaap_InventoryFinishedGoodsNetOfReserves 66,045us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 187,379us-gaap_InventoryNet $ 182,026us-gaap_InventoryNet