Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) (Interest Expense [Member], Cash Flow Interest Rate Contracts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense [Member] | Cash Flow Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Gain)/loss recognized in OCI (effectiveness)	$ (2,516)	$ 2,644	$ (6,485)
Loss reclassified from OCI into income	6,068	8,593	11,428
Loss recognized due to ineffectiveness