Derivative Instruments And Hedging Activities Location of Gain Loss in Incoem Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	$ 20,986		$ 20,986		$ 1,870
Gain (Loss) on Price Risk Derivatives, Net	20,473	10,034	56,184	9,382
Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Price Risk Derivatives, Net	19,869	10,034	55,738	9,382
Operating Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Price Risk Derivatives, Net	$ 604	$ 0	$ 446	$ 0