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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Derivative Asset Positions    
Gross position - asset / (liability) $ 115 $ 0
Netting adjustment (42) 0
Net position - asset / (liability) 73 0
Derivative Liability Positions    
Gross position - asset / (liability) (42) (487)
Netting adjustment 42 0
Net position - asset / (liability) $ 0 $ (487)