Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) (Cash Flow Interest Rate Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cash Flow Interest Rate Contracts [Member]
(Gain)/loss recognized in OCI (effectiveness)	$ 2,032	$ 17,325	$ 6,537	$ 26,972
Loss reclassified from OCI into income	$ 2,784	$ 3,510	$ 8,958	$ 10,559