Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Rental revenues									$ 105,939	$ 120,666	$ 121,934
Revenues	$ 196,029	$ 176,643	$ 109,712	$ 206,884	$ 227,511	$ 217,405	$ 228,080	$ 237,182	689,268	910,178	780,931
Gross profit (loss), by segment									(108,562)	138,473	110,608
Total interest expense									75,900	70,200	71,000
Depreciation and amortization									42,829	42,493	32,175
Impairment of goodwill and intangible assets and closure and other impairment charges									132,600	1,500	2,100
Capital expenditures									10,927	19,424	14,279
Goodwill (franchise segment)	251,628				343,862				251,628	343,862	345,300	$ 339,200
Total assets	2,074,945				2,049,511				2,074,945	2,049,511	1,774,700
Operating Segments
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									248,700	382,800	353,100
Operating Segments | Franchise operations
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									230,500	338,400	313,300
Depreciation and amortization									10,100	10,300	10,500
Impairment of goodwill and intangible assets and closure and other impairment charges									122,100	0	0
Capital expenditures									0	600	0
Total assets	997,700				1,116,200				997,700	1,116,200	1,152,100
Operating Segments | Rental operations
Segment Reporting Information [Line Items]
Rental revenues									105,900	120,700	121,900
Gross profit (loss), by segment									16,400	29,900	31,200
Interest expense									6,300	7,700	9,200
Depreciation and amortization									12,300	13,400	11,700
Total assets	451,500				503,800				451,500	503,800	255,600
Operating Segments | Company restaurants
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									(3,500)	8,000	1,200
Interest expense									2,700	2,100	100
Depreciation and amortization									7,000	6,400	400
Impairment of goodwill and intangible assets and closure and other impairment charges									10,500	1,500	2,100
Capital expenditures									2,700	3,200	0
Total assets	121,100				134,300				121,100	134,300	66,500
Operating Segments | Financing operations
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									5,300	6,500	7,400
Total assets	49,900				72,000				49,900	72,000	73,700
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Gross profit (loss), by segment									(357,300)	(244,300)	(242,500)
Interest expense									66,900	60,400	61,700
Depreciation and amortization									13,400	12,400	9,600
Capital expenditures									8,200	15,600	14,300
Total assets	$ 454,700				$ 223,200				454,700	223,200	226,800
Financing revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									5,822	7,112	7,979
Financing revenues | Operating Segments | Financing operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									5,800	7,100	8,000
Franchisor
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									469,453	651,186	643,934
Franchisor | Operating Segments | Franchise operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									469,500	651,200	643,900
Food and Beverage
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax										$ 131,200
Food and Beverage | Operating Segments | Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 108,100		$ 7,100