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Franchise arrangements - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Franchise Arrangements [Line Items]    
Property and equipment, net    $ 1,119,885 $ 856,085
Land 136,195 134,407
Property and equipment under franchise arrangements    
Franchise Arrangements [Line Items]    
Property and equipment, net    109,642 98,067
Land $ 27,160 $ 25,213
Initial franchise fee    
Franchise Arrangements [Line Items]    
Finite-lived intangible asset, useful life 20 years