Derivative Financial Instruments Impact of Netting Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative Asset:
Derivative assets, gross	$ 74,027	$ 266,046
Effect of master netting agreements	(22,520)	(1,921)
Derivative asset, net	51,507	264,125
Derivative Liability:
Derivative liability, gross	40,448	2,290
Effect of master netting agreements	(22,520)	(1,921)
Derivative liability, net	$ 17,928	$ 369

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