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Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 18,363 $ 17,073
Royalties receivable 7,500 7,400
Customer note receivables 3,375 2,777
Prepaid income taxes 620 3,493
Employee loans and advances 361 364
Due from related party 21 39
Restricted cash 0 33
Other current assets 4,423 2,422
Total other current assets $ 34,663 $ 33,601