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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 25, 2018
Dec. 26, 2017
Changes in the carrying amount of goodwill      
Balance at the beginning of the period $ 123,220 $ 121,040  
Additions 1,528 2,180  
Impairment 0 0 $ 0
Balance at the end of the period 124,748 123,220 121,040
Accumulated goodwill impairment loss     4,800
Changes in the carrying amount of intangible assets      
Balance at the beginning of the period, net 1,959 2,700  
Amortization expense (725) (741)  
Balance at the end of the period, net 1,234 1,959 $ 2,700
Gross carrying amount 15,400 15,400  
Accumulated amortization 14,141 $ 13,416  
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 $ 400