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Acquisition of Businesses (Schedule of Non-Significant Acquisitions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 7,078 $ 7,119  
Franchised Restaurants [Member]      
Business Acquisition [Line Items]      
Property and equipment 429 0 $ 936
Identifiable intangible assets 5,346 0 853
Goodwill 200 0 1,621
Assumed debt 0 0 (206)
Gain on purchase of franchised restaurants (4,808) 0 0
Purchase price 1,167 0 3,204
Restaurants sold in exchange (261) 0 0
Settlement of franchise receivables (36) 0 (2,113)
Net cash paid at acquisition date $ 870 $ 0 $ 1,091