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Derivative Financial Instruments (Fair Value Of Derivative Instruments Included In Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Interest rate swap contracts | $ 14,082 | $ 22,137
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest rate swap contracts | 7,945 | 13,398
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest rate swap contracts | $ 6,137 | $ 8,739

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