Fair Value Measurements Derivatives Observable Inputs Reconciliation (Details) (Level 2, USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Level 2
Derivatives Measured on a Recurring Basis, Observable Input Rollforward
Beginning Balance	$ 18,249	$ 22,273	$ 8,309	$ 24,859
Gain (loss) included in earnings	6,424	4,663	17,182	23,904
Gain (loss) included in other comprehensive income	(15,076)	(5,591)	(35,774)	(22,246)
Transfers in and/or out of Level 2	0	0	0	0
Purchases, sales, issuances, settlements	0	0	0	0
Ending Balance	$ 26,901	$ 23,201	$ 26,901	$ 23,201

Fair Value Derivative Measurement Observable Inputs Reconciliation Recurring Basis Gain (Loss) Included in Earnings

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Fair Value Derivative Measurement Observable Inputs Reconciliation Recurring Basis Gain (Loss) Included in Other Comprehensive Income

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Fair Value Derivative Measurement Observable Inputs Reconciliation Recurring Basis Transfers Net

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Fair Value Derivative Measurement Observable Inputs Recurring Basis Purchases, Sales, Issuances, Settlements

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Fair Value, Derivatives Measured on a Recurring Basis, Observable Input Reconciliation, Calculation [Roll Forward]

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Fair Value Observable Inputs Reconciliation Derivative Value

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