Derivative Instruments (Schedule Of Net Change Recognized And The Amounts And Location Of Income (Expense) and Gain (Loss) Reclassified Into Income For Interest Rate Contracts And Foreign Currency Contracts) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest Rate Agreements [Member]
Gain (Loss) Recognized in Other Comprehensive Income	$ 956	$ (26,871)	$ 1,911	$ (26,755)
Expense and Gain Reclassified into Income	(1,518)	(2,279)	(3,078)	(4,605)
Foreign Exchange Contracts [Member]
Gain (Loss) Recognized in Other Comprehensive Income		2	(55)	2
Expense and Gain Reclassified into Income	$ 107		$ 227