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Commitments and contingencies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
period
Dec. 31, 2014
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]      
Reinvestment plan term 3 years    
Percentage of gross sales of restaurants 5.00%    
Initial royalty period 10 years    
Number of subsequent payment periods | period 2    
Required minimum fixed charge coverage ratio 1.50    
Maximum leverage ratio 4.25    
Provision for contingencies $ 26,158,000   $ 28,509,000
Provision for contingencies, current 2,035,000   2,436,000
Provision for contingencies, noncurrent 24,123,000   26,073,000
Damage sought   $ 30,000,000  
Provision related to claims covered by indemnification agreement 1,612,000   $ 3,970,000
Standby Letters of Credit      
Line of Credit Facility [Line Items]      
Standby letters of credit with an aggregate drawing amount 80,000,000    
Amounts that have been drawn 0    
Puerto Rican Franchisees Lawsuit      
Line of Credit Facility [Line Items]      
Damage sought $ 66,700,000    
Puerto Rico Owner Operator's Association      
Line of Credit Facility [Line Items]      
Damage sought   $ 31,000,000  
Next Five Years      
Line of Credit Facility [Line Items]      
Royalty fee (as a percent) 6.00%    
Subsequent period of the agreement 5 years    
Last Five Years      
Line of Credit Facility [Line Items]      
Royalty fee (as a percent) 7.00%    
Subsequent period of the agreement 5 years    
Minimum      
Line of Credit Facility [Line Items]      
Tax law, estimate of possible loss $ 210,000,000    
Maximum      
Line of Credit Facility [Line Items]      
Tax law, estimate of possible loss $ 227,000,000