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Litigation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 01, 2017
Dec. 31, 2016
Litigation [Abstract]      
Litigation provisions $ 10,018 $ 10,018  
Accrued Patent Litigation $ 16,000 $ 16,000 $ 7,000