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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivative Asset Positions    
Gross position - asset / (liability) $ 25 $ 181
Netting adjustment 0 (35)
Net position - asset / (liability) 25 146
Derivative Liability Positions    
Gross position - asset / (liability) (609) (35)
Netting adjustment 0 35
Net position - asset / (liability) $ (609) $ 0