Inventories (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	60.00%	56.00%
Excess of current costs over stated LIFO value	$ 8,975	$ 8,975
Inventory obsolescence reserves	$ 8,502	$ 9,099

Amount of valuation reserve for inventory.

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