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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Changes in the carrying amount of goodwill      
Balance at the beginning of the period $ 116,571 $ 116,571  
Additions 4,469    
Impairment 0 0 $ 0
Balance at the end of the period 121,040 116,571 116,571
Accumulated goodwill impairment loss     4,800
Changes in the carrying amount of intangible assets      
Balance at the beginning of the period, net 3,622 4,827  
Amortization expense (922) (1,205)  
Balance at the end of the period, net 2,700 3,622 $ 4,827
Gross carrying amount 15,400 15,400  
Accumulated amortization 12,675 $ 11,753  
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