Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	$ 12,663	$ 23,719
Interest Expense [Member]
Derivative [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	18,356	4,628
Derivative Instruments Not Designated as Hedging Instruments, Loss	$ 14	$ 0