Derivatives (Activity In Accumulated Other Comprehensive Income (Loss) Related To Interest Rate Swaps) (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Interest Rate Swap	Mar. 31, 2012 Interest Rate Swap	Mar. 31, 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						$ 1,951
Accumulated Other Comprehensive Income (Loss) from Interest Rate Swaps [Roll Forward]
Accumulated other comprehensive loss resulting from interest rate swaps, beginning balance	(131,280)	(134,923)	(109,123)	(10,398)	(10,714)
Other comprehensive income (loss) recognized during the period				815	389
Accumulated other comprehensive loss resulting from interest rate swaps, ending balance	$ (131,280)	$ (134,923)	$ (109,123)	$ (9,583)	$ (10,325)