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Derivative Financial Instruments (Derivatives And Hedging-Fair Value Hedges) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Interest Expense Recognized on Fixed-Rate Debt (Related Hedged Item)	$ 29,123	$ 26,486
Interest Rate Swap Agreements [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized on Derivative		203
Amount of Interest Expense Recognized on Fixed-Rate Debt (Related Hedged Item)		$ 2,222

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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