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Acquisition of businesses (Schedule of Non-Significant Acquisitions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Goodwill $ 5,939 $ 7,078
Franchised Restaurants    
Business Acquisition [Line Items]    
Property and equipment 413 429
Identifiable intangible assets 56 5,346
Goodwill 0 200
Gain on purchase of franchised restaurants 0 (4,808)
Purchase price 469 1,167
Restaurants sold in exchange 0 (261)
Settlement of franchise receivables (469) (36)
Net cash paid at acquisition date $ 0 $ 870