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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivative Asset Positions    
Gross position - asset / (liability) $ 396 $ 113
Netting adjustment (1) (113)
Net position - asset / (liability) 395 0
Derivative Liability Positions    
Gross position - asset / (liability) (1) (214)
Netting adjustment 1 113
Net position - asset / (liability) $ 0 $ (101)