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 ($)	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional Value	$ 936,507,000	$ 179,110,000
Accounts Payable and Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Negative Fair Value	$ (17,707,000)	$ (3,591,000)