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Forgivable Loans (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jul. 01, 2017
Dec. 31, 2016
Forgivable loans activity    
Beginning balance $ 33,962 $ 44,685
Advances 4,205 6,949
Accruals   316
Repayments (130) (709)
Reclassification to other receivables (1,852)  
Amortization (6,873) (16,575)
Effect of foreign currency translation 218 (704)
Ending balance 29,530 33,962
Current portion of forgivable loans 7,319 5,897
Non-current portion of forgivable loans $ 22,211 $ 28,065