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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Percentage of LIFO inventory 45.00% 45.00%
Excess of current costs over stated LIFO value $ 8,712 $ 8,712
Inventory obsolescence reserves $ 7,996 $ 9,675