Segments - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Rental revenues	$ 29,549	$ 31,951
Total revenues from external customers	206,235	213,767
Interest expense	19,200	15,700
Total depreciation and amortization	9,741	9,222
Pretax book income (loss)	24,046	36,169
Operating Segments
Segment Reporting Information [Line Items]
Pretax book income (loss)	97,400	103,700
Corporate
Segment Reporting Information [Line Items]
Interest expense	18,100	14,700
Total depreciation and amortization	4,700	4,100
Pretax book income (loss)	(73,400)	(67,500)
Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	2,400	2,500
Pretax book income (loss)	89,400	92,600
Rental operations | Operating Segments
Segment Reporting Information [Line Items]
Rental revenues	29,500	32,000
Interest expense	1,100	1,000
Total depreciation and amortization	2,600	2,600
Pretax book income (loss)	7,600	10,400
Company restaurants | Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	0	0
Pretax book income (loss)	(0)	(0)
Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Pretax book income (loss)	400	700
Franchise operations
Segment Reporting Information [Line Items]
Revenue from contract with customer	175,877	179,962
Franchise operations | Franchise operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer	175,900	180,000
Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer	274	1,057
Company restaurants | Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer	300	1,000
Financing revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer	535	797
Financing revenues | Financing operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue from contract with customer	$ 500	$ 800