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Acquisition of Businesses (Schedule of Non-Significant Acquisitions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 7,119 $ 12,250  
Franchised Restaurants [Member]      
Business Acquisition [Line Items]      
Property and equipment   936 $ 583
Identifiable intangible assets   853 518
Goodwill   1,621 2,029
Assumed debt   (206) 0
Gain on bargain purchase of franchised restaurants   0 (71)
Purchase price   3,204 3,059
Restaurants sold in exchange   0 0
Settlement of franchise receivables   (2,113) (1,436)
Seller financing   0 (798)
Purchase price paid at acquisition date   $ 1,091 $ 825