Inventories (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	45.00%	37.00%
Excess of current costs over stated LIFO value	$ 10,230	$ 10,230
Inventory obsolescence reserves	$ 8,050	$ 7,601