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Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]    
Balance at January 1 $ 1,184 $ 1,207
Increase for tax position 0 40
Decrease for tax position on account of settlement (402) (108)
Interest accrual 44 51
Foreign currency revaluation 85 (6)
Balance at December 31 $ 911 $ 1,184