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, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Interest Expense [Member] | Interest Rate Exchange Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income	$ (38,797)	$ (31,792)
Income (Expense) and Gain (Loss) Reclassified into Income	(6,197)	(8,805)
Other Expense [Member] | Interest Rate Exchange Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income (Expense) and Gain (Loss) Reclassified into Income	(786)	(440)
Sales [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income	(55)	126
Income (Expense) and Gain (Loss) Reclassified into Income	$ 227	$ 126