Derivative Instruments And Hedging Activities (Schedule Of Notional Values And Fair Values Of Derivative Instruments) (Details) - Cash Flow Interest Rate Contracts [Member] - Designated As Hedging Instrument [Member] - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional Value	$ 179,110,000	$ 272,967,000
Accounts Payable and Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives, Negative fair value	$ (3,591,000)	$ (5,641,000)