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Forgivable Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2016
Forgivable loans activity    
Beginning Balance $ 33,962 $ 44,685
Advances 1,450 6,949
Accruals   316
Repayments   (709)
Amortization (3,603) (16,575)
Effect of foreign currency translation 54 (704)
Ending Balance 31,863 33,962
Current portion of forgivable loans 6,179 5,897
Non-current portion of forgivable loans $ 25,684 $ 28,065