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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (Effectiveness)	$ 5,552	$ (1,418)	$ (10,973)	$ (2,816)
Loss Reclassified From OCI Into Income	1,391	$ 853	4,273	$ 3,060
None [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized Due to Ineffectiveness	$ 1		$ 45