Derivatives and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) (Interest Rate Cap [Member], Cash Flow Hedging [Member], Designated as Hedging Instrument [Member], Derivative Financial Instruments, Liabilities [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Interest Rate Cap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, at fair value	$ 0