Derivatives and Hedging Activities (Tabular Disclosure Offsetting Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 0	$ 1,892
Gross Amounts of Recognized Liabilities	(15,241)	(6,922)
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	0	1,892
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	(15,241)	(6,922)
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	$ (15,241)	$ (5,030)