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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Disaggregation of Revenue [Line Items]          
Advertising fees and related income $ 8,355 $ 7,466 $ 16,960 $ 14,734  
Contract with Customer, Portion of Liability not yet being Amortized 9,300   $ 9,300   $ 10,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period     7 years 8 months 12 days    
Franchise Segment [Member] | Transferred over Time [Member]          
Disaggregation of Revenue [Line Items]          
Initial Franchise Fees 618 527 $ 1,304 1,268  
Franchise Segment [Member] | Transferred at Point in Time [Member]          
Disaggregation of Revenue [Line Items]          
Royalty Revenue 14,950 13,133 30,336 25,824  
Advertising fees and related income $ 8,355 $ 7,466 $ 16,960 $ 14,734