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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 25, 2018
Dec. 26, 2017
Dec. 27, 2016
Changes in the carrying amount of goodwill      
Balance at the beginning of the period $ 121,040 $ 116,571  
Additions 2,180 4,469  
Impairment 0 0 $ 0
Balance at the end of the period 123,220 121,040 116,571
Accumulated goodwill impairment loss     4,800
Changes in the carrying amount of intangible assets      
Balance at the beginning of the period, net 2,700 3,622  
Amortization expense (741) (922)  
Balance at the end of the period, net 1,959 2,700 $ 3,622
Gross carrying amount 15,400 15,400  
Accumulated amortization 13,416 $ 12,675  
Minimum      
Changes in the carrying amount of intangible assets      
Expected amortization expense for each of the next five years 200    
Maximum      
Changes in the carrying amount of intangible assets      
Expected amortization expense for each of the next five years $ 700