Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) - Cash Flow Interest Rate Contracts [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI (effectiveness)	$ (9,426)	$ (1,523)
Loss reclassified from OCI into income	1,345	$ 1,162
None [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized due to ineffectiveness	$ 13