Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 153,666		$ 153,666		$ 69,802
Amortization expense	7,900	$ 6,300	20,600	$ 17,800
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	272,028		272,028		176,354
Accumulated Amortization	(118,362)		(118,362)		(106,552)
Net Balance	153,666		$ 153,666		69,802
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			12 years 7 months 6 days
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	68,438		$ 68,438		54,704
Accumulated Amortization	(34,719)		(34,719)		(24,735)
Net Balance	33,719		$ 33,719		29,969
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 8 months 12 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	49,119		$ 49,119		44,389
Accumulated Amortization	(27,012)		(27,012)		(18,926)
Net Balance	22,107		$ 22,107		25,463
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 4 months 24 days
Software Development
Finite Lived Intangible Assets [Line Items]
Capitalized software development costs	3,500		$ 3,500		1,400
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,352		2,352		2,325
Accumulated Amortization	(1,471)		(1,471)		(1,274)
Net Balance	881		$ 881		1,051
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			8 years 3 months 18 days
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	12,897		$ 12,897		3,920
Accumulated Amortization	(3,868)		(3,868)		(2,814)
Net Balance	9,029		$ 9,029		1,106
Non-compete agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			5 years
Training materials
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,400		$ 2,400		2,400
Accumulated Amortization	(1,480)		(1,480)		(1,120)
Net Balance	920		$ 920		1,280
Training materials | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			5 years
Other
Finite Lived Intangible Assets [Line Items]
Initial Cost	1,670		$ 1,670		1,670
Accumulated Amortization	(888)		(888)		(601)
Net Balance	$ 782		$ 782		$ 1,069
Other | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			5 years 3 months 18 days