Revenue Disclosures - Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Franchise revenues
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 156,200	$ 162,078	$ 487,794	$ 469,332
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenue	72,506	75,910	226,888	229,162
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	67,514	71,016	211,882	193,557
Pancake and waffle dry mix sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenue	13,201	12,541	40,158	37,809
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 2,979	$ 2,611	$ 8,866	$ 8,804