Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in earnings related to the ineffective portion of the hedging relationship	$ 0		$ 0		$ 0		$ 0
Gain (loss) recognized in earnings related to the amount excluded from effectiveness testing	0		0		0		0
Interest Rate Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion)	3,618		19,666		12,346		19,666
Interest Rate Swap Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Earnings (Effective Portion)	$ 2,728	[1]	$ 2,376	[1]	$ 7,008	[2]	$ 2,376	[2]

[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 September 30, 2012 and 2011.

[2] 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 nine months ended September 30, 2012 and 2011.