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Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 10,932 $ 10,517
Royalties receivable 7,500 7,400
Local tax receivables 6,969 6,556
Prepaid income taxes 4,245 3,493
Customer notes receivable 2,565 2,777
Employee loans and advances 340 364
Restricted cash 0 33
Other current assets 2,534 2,461
Total other current assets $ 35,085 $ 33,601