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Derivative Financial Instruments (Derivatives And Hedging-Fair Value Hedges) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Interest Expense Recognized on Fixed-Rate Debt (Related Hedged Item)	$ 27,332	$ 25,316	$ 79,806	$ 69,611
Interest Rate Swap Agreements [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized on Derivative	264		1,275	4,604
Amount of Interest Expense Recognized on Fixed-Rate Debt (Related Hedged Item)	$ (1,333)		$ (7,556)	$ (17,277)

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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