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Franchise arrangements (Schedule of Revenues from Franchised Restaurants) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]      
Rent $ 148,094 $ 155,405 $ 123,311
Total 3,081,571 3,319,525 2,928,630
Initial fees paid to McDonald's Corporation 1,323 1,417 1,588
Royalty fees paid to McDonald's Corporation 57,733 64,806 50,839
Franchise      
Disaggregation of Revenue [Line Items]      
Total 148,962 157,269 125,296
Revenues 148,962 157,269 125,296
Franchise, Initial Fees      
Disaggregation of Revenue [Line Items]      
Total 195 1,205 1,386
Franchise, Royalty Fees      
Disaggregation of Revenue [Line Items]      
Total $ 673 $ 659 $ 599