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Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]    
Balance at January 1 $ 1,760 $ 2,245
Increase for tax position 27 206
Decrease for tax position on account of settlement (588) (722)
Interest accrual 0 53
Foreign currency revaluation 8 (22)
Balance at December 31 $ 1,207 $ 1,760