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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials $ 28,955us-gaap_InventoryRawMaterialsNetOfReserves $ 26,908us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 18,175us-gaap_InventoryWorkInProcessNetOfReserves 16,859us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 126,240us-gaap_InventoryFinishedGoodsNetOfReserves 116,575us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 173,370us-gaap_InventoryNet $ 160,342us-gaap_InventoryNet