Derivatives and Hedging Activities (Schedule of Interest Rate Derivatives) (Details) (Interest Rate Swap [Member], USD $)	Dec. 31, 2014 derivative
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of Instruments	1
Notional Amount	$ 51,400,000
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of Instruments	17
Notional Amount	$ 1,249,004,000