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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative Asset Positions    
Gross position - asset / (liability) $ 64 $ 0
Netting adjustment (64) 0
Net position - asset / (liability) 0 0
Derivative Liability Positions    
Gross position - asset / (liability) (109) (487)
Netting adjustment 64 0
Net position - asset / (liability) $ (45) $ (487)