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Significant Accounting Policies - Leases (Details)
$ in Thousands
3 Months Ended
Apr. 02, 2019
USD ($)
lease
Jan. 01, 2019
USD ($)
Significant Accounting Policies    
Initial term of leases, Restaurant locations 20 years  
Renewal term of leases, Restaurant locations 5 years  
Number of leases that have been executed but have not yet commenced | lease 2  
Undiscounted fixed payments | $ $ 1,629,400 $ 938,374