Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 76,065		$ 76,065		$ 87,670
Amortization expense	6,400	$ 5,200	18,300	$ 15,500
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	180,867		180,867		180,867
Accumulated Amortization	(104,802)		(104,802)		(93,197)
Net Balance	76,065		$ 76,065		87,670
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			12 years 6 months
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	52,552		$ 52,552		45,484
Accumulated Amortization	(21,128)		(21,128)		(13,169)
Net Balance	31,424		$ 31,424		32,315
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 7 months 6 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	42,251		$ 42,251		36,680
Accumulated Amortization	(15,952)		(15,952)		(9,653)
Net Balance	26,299		$ 26,299		27,027
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 4 months 24 days
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,311		$ 2,311		1,904
Accumulated Amortization	(1,204)		(1,204)		(1,037)
Net Balance	1,107		$ 1,107		867
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			8 years 3 months 18 days
Software Development
Finite Lived Intangible Assets [Line Items]
Capitalized software development costs	800		$ 800		10,500
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	3,920		3,920		3,700
Accumulated Amortization	(2,479)		(2,479)		(1,546)
Net Balance	1,441		$ 1,441		2,154
Non-compete agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 4 months 24 days
Training materials
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,400		$ 2,400		2,400
Accumulated Amortization	(1,000)		(1,000)		(640)
Net Balance	1,400		$ 1,400		1,760
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		800
Accumulated Amortization	(493)		(493)		(293)
Net Balance	$ 1,177		$ 1,177		$ 507
Other | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			3 years 9 months 18 days