Inventory (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Inventory [Abstract]
Temporary LIFO liquidation gain inventory	$ 0	$ 1,000,000	$ 0	$ 1,000,000