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 ($)	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional Value	$ 952,031,000	$ 179,110,000
Accounts Payable and Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives, Negative fair value	$ (12,192,000)	$ (3,591,000)