Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) - Cash Flow Interest Rate Contracts [Member] - Interest Expense [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) recognized in OCI (effectiveness)	$ (2,137)	$ (2,576)	$ 2,644
Loss reclassified from OCI into income	$ 3,824	$ 6,068	$ 8,593