Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 79,933		$ 79,933		$ 87,670
Amortization expense	6,000	$ 5,100	11,800	$ 10,300
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	180,867		180,867		180,867
Accumulated Amortization	(100,934)		(100,934)		(93,197)
Net Balance	79,933		$ 79,933		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	45,877		$ 45,877		45,484
Accumulated Amortization	(18,249)		(18,249)		(13,169)
Net Balance	27,628		$ 27,628		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	36,946		$ 36,946		36,680
Accumulated Amortization	(13,628)		(13,628)		(9,653)
Net Balance	23,318		$ 23,318		27,027
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 3 months 18 days
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,021		$ 2,021		1,904
Accumulated Amortization	(1,148)		(1,148)		(1,037)
Net Balance	873		$ 873		867
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			9 years
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	3,700		3,700		3,700
Accumulated Amortization	(2,168)		(2,168)		(1,546)
Net Balance	1,532		$ 1,532		2,154
Non-compete agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			4 years 6 months
Training materials
Finite Lived Intangible Assets [Line Items]
Initial Cost	2,400		$ 2,400		2,400
Accumulated Amortization	(880)		(880)		(640)
Net Balance	1,520		$ 1,520		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	810		$ 810		800
Accumulated Amortization	(425)		(425)		(293)
Net Balance	$ 385		$ 385		$ 507
Other | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			3 years 9 months 18 days