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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Finished goods $ 189,976us-gaap_InventoryFinishedGoodsNetOfReserves $ 185,655us-gaap_InventoryFinishedGoodsNetOfReserves
Work-in-process 5,321us-gaap_InventoryWorkInProcessNetOfReserves 4,722us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 88,404us-gaap_InventoryRawMaterialsNetOfReserves 87,674us-gaap_InventoryRawMaterialsNetOfReserves
Total inventories $ 283,701us-gaap_InventoryNet $ 278,051us-gaap_InventoryNet