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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials and component parts $ 31,282us-gaap_InventoryRawMaterials $ 36,383us-gaap_InventoryRawMaterials
Finished goods 73,272us-gaap_InventoryFinishedGoods 65,943us-gaap_InventoryFinishedGoods
Inventories $ 104,554us-gaap_InventoryNet $ 102,326us-gaap_InventoryNet