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Forgivable Loans (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Forgivable loans activity    
Beginning balance $ 33,962 $ 44,685
Advances 10,134 6,949
Accruals 670 316
Repayments (1,884) (709)
Reclassification to other receivables (1,102)  
Amortization (10,293) (16,575)
Effect of foreign currency translation 375 (704)
Ending balance 31,862 33,962
Current portion of forgivable loans 6,474 5,897
Non-current portion of forgivable loans $ 25,388 $ 28,065