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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2020
Dec. 31, 2019
Dec. 25, 2018
Changes in the carrying amount of goodwill      
Balance at the beginning of the period $ 124,748 $ 123,220  
Additions 3,329 1,528  
Disposals and other, net 0 0  
Impairment (1,076) 0 $ 0
Balance at the end of the period 127,001 124,748 123,220
Accumulated goodwill impairment loss     4,800
Changes in the carrying amount of intangible assets      
Balance at the beginning of the period, net 1,234 1,959  
Additions 1,600 0  
Amortization expense (563) (725)  
Disposals and other, net 0 0  
Impairment 0 0  
Balance at the end of the period, net 2,271 1,234 $ 1,959
Gross carrying amount 16,600 15,400  
Accumulated amortization 14,341 $ 14,141  
Minimum      
Changes in the carrying amount of intangible assets      
Expected amortization expense for each of the next five years 100    
Maximum      
Changes in the carrying amount of intangible assets      
Expected amortization expense for each of the next five years $ 800