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) |