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Derivative Instruments (Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 5,810 | $ 14,012
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 5,810 | $ 14,012

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