Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Rental revenues									$ 120,666	$ 121,934	$ 121,437
Revenues	$ 227,511	$ 217,405	$ 228,080	$ 237,182	$ 214,198	$ 194,099	$ 184,471	$ 188,163	910,178	780,931	731,725
Gross profit (loss), by segment									138,473	110,608	(428,309)
Total interest expense									70,200	71,000	72,700
Depreciation and amortization									42,493	32,175	30,648
Impairment of goodwill and intangible assets									0	0	531,634
Closure and other impairment charges									1,487	2,107	3,968
Impairment of goodwill and intangible assets and closure and other impairment charges									1,500	2,100	535,600
Capital expenditures									19,424	14,279	13,370
Goodwill (franchise segment)	343,862				345,314				343,862	345,314	339,200	$ 697,400
Total assets	2,049,511				1,774,680				2,049,511	1,774,680	1,735,600
Corporate
Segment Reporting Information [Line Items]
Interest expense									60,400	61,700	62,000
Depreciation and amortization									12,400	9,600	7,700
Capital expenditures									15,600	14,300	13,300
Total assets	223,200				226,800				223,200	226,800	181,300
Operating Segments
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									382,800	353,100	338,700
Operating Segments | Franchise operations
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									338,400	313,300	300,400
Depreciation and amortization									10,300	10,500	10,800
Impairment of goodwill and intangible assets									0	0
Capital expenditures									600	0	0
Total assets	1,116,200				1,152,100				1,116,200	1,152,100	1,188,000
Operating Segments | Rental operations
Segment Reporting Information [Line Items]
Rental revenues									120,700	121,900	121,400
Gross profit (loss), by segment									29,900	31,200	30,800
Interest expense									7,700	9,200	10,500
Depreciation and amortization									13,400	11,700	12,000
Total assets	503,800				255,600				503,800	255,600	278,800
Operating Segments | Company restaurants
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									8,000	1,200	(300)
Interest expense									2,100	100	200
Depreciation and amortization									6,400	400	100
Closure and other impairment charges									1,500	2,100	4,000
Capital expenditures									3,200	0	100
Total assets	134,300				66,500				134,300	66,500	0
Operating Segments | Financing operations
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									6,500	7,400	7,800
Total assets	$ 72,000				$ 73,700				72,000	73,700	87,500
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									(244,300)	(242,500)	(767,000)
Financial Service
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									7,112	7,979	8,352
Financial Service | Operating Segments | Financing operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									7,100	8,000	8,400
Franchisor
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									651,186	643,934	594,418
Franchisor | Operating Segments | Franchise operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									651,200	643,900	594,400
Food and Beverage
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									131,214	$ 7,084	7,518
Food and Beverage | Operating Segments | Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 131,200		$ 7,500