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Forgivable Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Forgivable loan activity    
Beginning balance $ 28,628 $ 33,962
Advances 23,028 11,672
Repayments (3,333) (2,135)
Reclassification to other assets   (1,100)
Amortization (3,552) (14,155)
Effects of foreign currency translation 22 384
Ending balance 44,793 28,628
Current portion of forgivable loans 6,651 5,540
Non-current portion of forgivable loans $ 38,142 $ 23,088