Derivative Instruments And Hedging Activities (Schedule Of Notional Values And Fair Values Of Derivative Instruments Designated As Hedging Instruments) (Details) - Cash Flow Interest Rate Contracts [Member] - Designated As Hedging Instrument [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Notional Value	$ 250,000,000
Derivative Assets, Notional Value		$ 250,000,000
Accounts Payable and Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities , Fair Value	$ 1,262,000
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets , Fair Value		$ 1,086,000