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Revenue Disclosures - Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Franchise revenues
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 140,976	$ 145,037
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenue	65,767	67,600
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	60,885	61,723
Pancake and waffle dry mix sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenue	10,890	12,848
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 3,434	$ 2,866

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