Derivatives and Hedging Activities (Schedule of Interest Rate Derivatives) (Details) (Cash Flow Hedging [Member], Designated as Hedging Instrument [Member], Interest Rate Cap [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 derivative
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Number of Interest Rate Derivatives Held	1
Notional Amount of Interest Rate Derivatives	$ 50,000