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Forgivable Loans (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Forgivable loan activity    
Beginning balance $ 28,628 $ 33,962
Advances 22,649 11,672
Repayments (3,333) (2,135)
Reclassification to other assets   (1,100)
Amortization (7,594) (14,155)
Effects of foreign currency translation (100) 384
Ending balance 40,250 28,628
Current portion of forgivable loans 5,876 5,540
Non-current portion of forgivable loans $ 34,374 $ 23,088