Derivative Financial Instruments - Schedule of Netting Offsets of Derivative Asset and Liability Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Derivative Assets [Abstract]
Derivative asset, Gross Amount Presented on Balance Sheet	$ 407,052	$ 151,716
Derivative asset, Netting Adjustments	(297,951)	(60,601)
Derivative asset, Cash Collateral Posted (Received)	0	0
Derivative asset, Net Exposure	109,101	91,115
Derivative liability, Gross Amount Presented on Balance Sheet	(347,611)	(60,601)
Derivative liability, Netting Adjustments	297,951	60,601
Derivative liability, Cash Collateral Posted (Received)	0	0
Derivative liability, Net Exposure	$ (49,660)	$ 0