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Goodwill - Gross and net carrying amounts of goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]        
Gross $ 704,600 $ 709,100    
Accumulated Impairment Loss (450,500) (455,100)    
Net 254,062 253,956 $ 251,600 $ 251,600
Franchised | Applebee's        
Goodwill [Line Items]        
Gross 686,700 686,700    
Accumulated Impairment Loss (450,500) (450,500)    
Net 236,200 236,200 236,200 236,200
Franchised | IHOP        
Goodwill [Line Items]        
Gross 10,800 10,800    
Accumulated Impairment Loss 0 0    
Net 10,800 10,800 10,800 10,800
Franchised | Fuzzy's        
Goodwill [Line Items]        
Gross 7,100 7,000    
Accumulated Impairment Loss 0 0    
Net 7,100 7,000 0 0
Entity Operated Units | Applebee's        
Goodwill [Line Items]        
Gross 0 4,600    
Accumulated Impairment Loss 0 (4,600)    
Net $ 0 $ 0 $ 4,600 $ 4,600