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Acquisition of businesses - Schedule of Non-Significant Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2020
Business Acquisition [Line Items]        
Goodwill $ 5,210 $ 5,601    
Net cash paid at acquisition date 185 3,833 $ 2,658  
Franchised Restaurants        
Business Acquisition [Line Items]        
Property and equipment 185 16,756 1,471  
Identifiable intangible assets 0 4,922 1,347  
Goodwill 0 1,224 1,589  
Assumed debt 0 0 (77)  
Gain on purchase of franchised restaurants 0 (1,708) (767)  
Purchase price 185 21,194 3,563  
Seller financing 0 (1,000) 0  
Settlement of franchise receivables 0 (16,361) (905)  
Net cash paid at acquisition date $ 185 $ 3,833 $ 2,658  
Puerto Rican Franchisees        
Business Acquisition [Line Items]        
Property and equipment       $ 14,290