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Forgivable Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Interest rate (as a percent) 0.0325  
Amount of forgivable loan write-down or write-off $ 0 $ 0
Forgivable loans activity    
Beginning Balance 44,685 45,356
Advances 6,949 14,531
Accruals (316)  
Repayments (709)  
Amortization (16,575) (15,202)
Effect of foreign currency translation (704)  
Ending Balance 33,962 44,685
Current portion of forgivable loans 5,897 4,402
Non-current portion of forgivable loans $ 28,065 $ 40,283
Minimum    
Term of forgivable loans or advances 3 years  
Maximum    
Term of forgivable loans or advances 8 years