Segments - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Rental revenues	$ 28,807	$ 26,142
Total revenues	230,423	204,199
Interest expense	17,400	18,700
Depreciation and amortization	9,938	9,995
Pretax book income (loss)	34,157	24,014
Operating Segments
Segment Reporting Information [Line Items]
Pretax book income (loss)	92,800	85,300
Corporate
Segment Reporting Information [Line Items]
Interest expense	15,500	16,500
Depreciation and amortization	2,900	2,900
Pretax book income (loss)	(58,600)	(61,300)
Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	2,500	2,500
Pretax book income (loss)	83,200	76,000
Rental operations | Operating Segments
Segment Reporting Information [Line Items]
Rental revenues	28,800	26,100
Interest expense	1,100	1,300
Depreciation and amortization	2,600	2,800
Pretax book income (loss)	6,700	5,200
Company restaurants | Operating Segments
Segment Reporting Information [Line Items]
Interest expense	800	900
Depreciation and amortization	1,900	1,800
Pretax book income (loss)	2,000	3,100
Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Pretax book income (loss)	900	1,000
Franchise Revenue:
Segment Reporting Information [Line Items]
Revenue from contract with customer	161,232	140,976
Franchise Revenue: | Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer	161,200	141,000
Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer	39,416	35,949
Company restaurants | Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer	39,400	36,000
Financing revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer	968	1,132
Financing revenues | Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer	$ 1,000	$ 1,100