Derivative Financial Instruments Offsetting of Derivative Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Liabilities [Line Items]
Derivative Liability	$ 1,383	$ 967
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,322	565
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 61	$ 402