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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
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|
Level 2
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| 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 |