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Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]    
Balance $ 2,177 $ 2,063
Increase for tax position 285 389
Decrease for tax position on account of settlement 0 (661)
Interest accrual 63 313
Foreign currency revaluation (101) 73
Balance $ 2,424 $ 2,177