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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Leases [Abstract]      
Rent expense, net of sublease income $ 63,615 $ 52,585 $ 45,592
Future minimum rentals, net of minimum sublease income for five years and thereafter [Abstract]      
2018 46,868    
2019 41,330    
2020 27,374    
2021 22,930    
2022 14,532    
Thereafter $ 21,927