Derivative Instruments And Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Sale of Derivatives	$ (3,992)	$ 12,423	$ (166)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	(3,333)	(4,662)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	31,036	(125,499)	38
Cost of Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Sale of Derivatives	16,175	66,715
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	(6,317)	(6,317)
Gain (Loss) on Fair Value Hedges Recognized in Earnings	3,992	(12,423)	166
Operating Expenses (Increase) [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Sale of Derivatives			(166)
Revenues (decrease) [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	27,044	(113,076)	(128)
Gain (Loss) on Sale of Derivatives	(20,167)	(54,292)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	$ 2,984	$ 1,655