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Operating lease agreements (Schedule of Details of Rent Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense $ 184,844 $ 203,216 $ 174,453
Company-operated restaurants      
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense 139,279 148,505 131,142
Franchised restaurants      
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense $ 45,565 $ 54,711 $ 43,311