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Other Current Assets (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid Expense, Current $ 12,941 $ 13,051
Royalty Receivable 8,000 7,500
Prepaid income taxes 16,493 981
Due from Employees, Current 325 305
Accounts Receivable, Related Parties, Current 21 77
Other Assets, Miscellaneous, Current 4,149 5,134
Other current assets $ 41,929 $ 27,048