Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 87,670	$ 103,157
Amortization expense	20,600	19,500	$ 19,600
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	180,867	180,867
Accumulated Amortization	(93,197)	(77,710)
Net Balance	$ 87,670	103,157
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	$ 45,484	30,875
Accumulated Amortization	(13,169)	(7,910)
Net Balance	$ 32,315	22,965
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]
Capitalized software development costs	$ 10,500	4,500
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	1,904	1,857
Accumulated Amortization	(1,037)	(839)
Net Balance	$ 867	1,018
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	9 years 3 months 18 days
Software Development
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 36,680	20,579
Accumulated Amortization	(9,653)	(5,802)
Net Balance	$ 27,027	14,777
Software Development | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	4 years
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 3,700	3,700
Accumulated Amortization	(1,546)	(896)
Net Balance	$ 2,154	2,804
Non-compete agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	7 years 8 months 12 days
Training materials
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 2,400	2,350
Accumulated Amortization	(640)	(157)
Net Balance	$ 1,760	2,193
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	$ 800	2,389
Accumulated Amortization	(293)	(216)
Net Balance	$ 507	$ 2,173
Other | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	5 years