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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative Asset Positions    
Gross position - asset / (liability) $ 0 $ 113
Netting adjustment 0 (113)
Net position - asset / (liability) 0 0
Derivative Liability Positions    
Gross position - asset / (liability) (305) (214)
Netting adjustment 0 113
Net position - asset / (liability) $ (305) $ (101)