Derivatives (Activity In Accumulated Other Comprehensive Income (Loss) Related To Interest Rate Swaps) (Details) (USD $) In Thousands, unless otherwise specified				6 Months Ended		3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 Interest Rate Swap	Jun. 30, 2012 Interest Rate Swap	Jun. 30, 2013 Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred						$ 1,962
Accumulated Other Comprehensive Income (Loss) from Interest Rate Swaps [Roll Forward]
Accumulated other comprehensive loss resulting from interest rate swaps, beginning balance	(164,591)	(134,923)	(102,541)	(10,398)	(10,714)
Other comprehensive income (loss) recognized during the period				2,202	(306)
Accumulated other comprehensive loss resulting from interest rate swaps, ending balance	$ (164,591)	$ (134,923)	$ (102,541)	$ (8,196)	$ (11,020)