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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Components of inventories    
Inventory, Gross $ 49,917us-gaap_InventoryGross $ 50,063us-gaap_InventoryGross
Inventory Valuation Reserves 5,676us-gaap_InventoryValuationReserves 5,546us-gaap_InventoryValuationReserves
Inventories, net $ 44,241us-gaap_InventoryNet $ 44,517us-gaap_InventoryNet