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Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Taxes    
Balance - January 1, 2019 $ 2,424 $ 2,177
Increase in tax position 355 285
Interest accrual 234 63
Foreign currency remeasurement (56) (101)
Balance - December 31, 2019 $ 2,957 $ 2,424