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Derivative Financial Instruments Offsetting of Derivative Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Offsetting Assets [Line Items]    
Derivative Asset $ 3,082 $ 182
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 565 182
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 2,517 $ 0