Segments - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Rental revenues	$ 29,878	$ 30,324	$ 60,589	$ 61,165
Total revenues	228,080	184,471	465,262	372,634
Interest expense	17,000	17,800	35,400	35,500
Depreciation and amortization	10,600	7,900	20,800	15,842
Segment profit	29,067	24,596	70,199	47,307
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	94,900	78,600	197,400	162,100
Corporate and unallocated expenses, net
Segment Reporting Information [Line Items]
Segment profit	(65,800)	(54,000)	(127,200)	(114,800)
Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	2,600	2,700	5,100	5,300
Segment profit	83,800	69,000	172,400	142,400
Rental operations | Operating Segments
Segment Reporting Information [Line Items]
Rental revenues	29,900	30,400	60,600	61,200
Interest expense	1,900	2,300	4,300	4,800
Depreciation and amortization	3,400	2,900	6,900	5,800
Segment profit	7,000	7,600	15,000	15,800
Company restaurants | Operating Segments
Segment Reporting Information [Line Items]
Interest expense	500	0	1,100	0
Depreciation and amortization	1,800	0	3,100	0
Segment profit	2,500	0	6,700	0
Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Segment profit	1,600	2,000	3,300	3,900
Corporate
Segment Reporting Information [Line Items]
Interest expense	14,600	15,500	30,000	30,700
Depreciation and amortization	2,800	2,300	5,700	4,700
Franchise revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	162,668	151,941	331,594	307,254
Franchise revenues | Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	162,700	151,900	331,600	307,200
Company restaurant sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	33,751	0	69,486	0
Company restaurant sales | Company restaurants | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	33,700	0	69,500	0
Financing revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	1,783	2,206	3,593	4,215
Financing revenues | Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 1,800	$ 2,200	$ 3,600	$ 4,200