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Inventories (Schedule of Inventory) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Finished goods $ 179,849us-gaap_InventoryFinishedGoodsNetOfReserves $ 167,515us-gaap_InventoryFinishedGoodsNetOfReserves
Work-in-progress 518us-gaap_InventoryWorkInProcessNetOfReserves 703us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 4,353us-gaap_InventoryRawMaterialsNetOfReserves 2,794us-gaap_InventoryRawMaterialsNetOfReserves
Inventories $ 184,720us-gaap_InventoryNet $ 171,012us-gaap_InventoryNet