Derivatives and Hedging Activities (Schedule of Interest Rate Derivatives) (Details) - Interest Rate Swap [Member]	Dec. 31, 2015 USD ($) derivative	Dec. 31, 2014 USD ($) derivative
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of Instruments | derivative	1	1
Notional Amount | $	$ 51,400,000	$ 51,400,000
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of Instruments | derivative	16	17
Notional Amount | $	$ 1,211,651,000	$ 1,249,004,000