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Fair Value Measurements (Summary Of Changes In Level 3 Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Fair Value Disclosures [Abstract] | ||||||||||
| Derivatives, beginning of period | $ 17,130 | $ 24,596 | $ 29,331 | $ 25,228 | ||||||
| Total losses (gains) included in net income | (1,480) | 3,319 | (13,681) | 2,687 | ||||||
| Total losses (gains) included in other comprehensive income (loss) | 0 | 0 | 0 | 0 | ||||||
| Transfers into Level 3 | 0 | 0 | 0 | 0 | ||||||
| Transfers out of Level 3 | 0 | 0 | 0 | 0 | ||||||
| Derivatives, end of period | 15,650 | 27,915 | 15,650 | 27,915 | ||||||
| Net unrealized losses (gains) included in net income relating to liabilities held at September 30, 2012 and 2011 | $ (1,480) | [1] | $ 3,319 | [1] | $ (13,681) | [1] | $ 2,687 | [1] | ||
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