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Derivative Financial Instruments (Fair Value Of Derivative Instruments Included In Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 23,539	$ 19,091
Interest Rate Swap Contracts [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 23,539	$ 19,091

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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