Interest Rate Derivatives and Hedging Activities (Schedule Of Interest Rate Derivative) (Details) $ in Thousands	Mar. 31, 2016 USD ($) derivative	Dec. 31, 2015 USD ($) derivative
Interest rate caps | Not Designated as Hedging Instrument
Derivative [Line Items]
Number of instruments (in securities) | derivative	2	2
Notional Amount | $	$ 305,000	$ 305,000
Interest rate swaps | Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Number of instruments (in securities) | derivative	3	4
Notional Amount | $	$ 124,700	$ 131,988