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Derivative Financial Instruments (Derivatives and Hedging-Fair Value Hedges) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest expense recognized on fixed-rate debt	$ 25,988	$ 22,521	$ 52,474	$ 44,295
Interest Rate Swap Agreements [Member] \| Interest Expense [Member]
Amount of Gain Recognized on Derivative	808	1,588	1,011	4,604
Interest expense recognized on fixed-rate debt	$ (4,001)	$ (8,636)	$ (6,223)	$ (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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