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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (Effectiveness)	$ (7,099)	$ 124	$ (16,525)	$ (1,399)
Loss Reclassified From OCI Into Income	1,537	$ 1,046	2,882	$ 2,207
None [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized Due to Ineffectiveness	$ 33		$ 46