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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Changes in the carrying amount of goodwill      
Balance at the beginning of the period, Goodwill gross $ 164,625    
Balance at the end of the period, Goodwill gross 164,625    
Balance at the beginning of the period, Accumulated impairment losses (76,417)    
Balance at the end of the period, Accumulated impairment losses (76,417)    
Goodwill, net 88,208   $ 88,208
Balance at the end of the period, Goodwill, net 88,208    
Intangible assets impairment losses $ 0 $ 0