Interest Rate Derivatives and Hedging Activities (Schedule Of Interest Rate Derivative) (Details) $ in Thousands	Dec. 31, 2015 USD ($) derivative	Dec. 31, 2014 USD ($) derivative
Interest rate swaps | Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Number of Instruments | derivative	4	6
Notional Amount | $	$ 131,988	$ 179,988
Interest Rate Cap | Not Designated as Hedging Instrument
Derivative [Line Items]
Number of Instruments | derivative	2
Notional Amount | $	$ 305,000