Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (59)		$ (2,934)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1,911	[1]	(2,114)	[1]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	0		0
Gain (loss) recognized in earnings related to the amount excluded from effectiveness testing	$ 0		$ 0

[1] There were no gains or losses recognized in earnings related to any ineffective portion of the hedging relationship or related to any amount excluded from the assessment of hedge effectiveness for the three months ended March 31, 2013 and 2012.