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Inventories (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Percentage of LIFO inventory 41.00%us-gaap_PercentageOfLIFOInventory 37.00%us-gaap_PercentageOfLIFOInventory
Excess of current costs over stated LIFO value $ 10,230us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue $ 10,230us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue
Inventory obsolescence reserves $ 7,700us-gaap_InventoryValuationReserves $ 7,601us-gaap_InventoryValuationReserves