Derivatives and Hedging Activities (Tabular Disclosure Offsetting Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 0	$ 5,509
Gross Amounts of Recognized Liabilities	(15,350)	(7,384)
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	0	5,509
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(15,350)	(7,384)
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	$ (15,350)	$ (1,875)