Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Commitments and Contingencies Disclosure [Abstract]      
Minimum length of remaining non-cancelable terms, high end of range (less than one year) 1 year    
Maximum length of remaining non-cancelable terms, low end of range (more than 15 years) 15 years    
Rental expense related to land, building, and equipment leases      
Minimum rent $ 77,778 $ 73,605 $ 67,078
Contingent rent 1,604 1,676 2,264
Equipment rent under operating leases 1,024 1,052 791
Rental expense 80,406 76,333 $ 70,133
Capital Leases      
2018 1,234    
2019 1,234    
2020 1,238    
2021 1,240    
2022 1,063    
Thereafter 8,570    
Total 14,579    
Less amount representing interest (3,641)    
Present value of future minimum lease payments 10,938    
Less current portion (741)    
Long-term capital lease obligations 10,197    
Operating Leases      
2018 75,613    
2019 72,328    
2020 67,568    
2021 61,375    
2022 52,754    
Thereafter 224,517    
Total 554,155    
Assets under capital lease included in property and equipment      
Assets under capital lease 29,900 29,300  
Accumulated depreciation $ 12,300 $ 10,500