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Operating Lease Agreements (Schedule of Details of Rent Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense $ 203,216 $ 174,453 $ 171,613
Company Operated Restaurants [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense 148,505 131,142 135,232
Franchised Restaurants [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Total rent expense $ 54,711 $ 43,311 $ 36,381