Fair Value Measurements Derivatives Observable Inputs Reconciliation (Details) (Level 2, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Level 2
Derivatives Measured on a Recurring Basis, Observable Input Rollforward
Beginning Balance	$ 8,309	$ 24,859
Gain (loss) included in earnings	23,414	28,696
Gain (loss) included in other comprehensive income	(36,120)	(12,146)
Transfers in and/or out of Level 2	0	0
Purchases, sales, issuances, settlements	0	0
Ending Balance	$ 21,015	$ 8,309

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

No definition available.

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

No definition available.

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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

No definition available.

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Fair Value Observable Inputs Reconciliation Derivative Value

No definition available.

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