Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 103,157	$ 119,349
Amortization expense	19,500	19,600	$ 15,200
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	180,867	181,567
Accumulated Amortization	(77,710)	(62,218)
Net Balance	$ 103,157	119,349
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	$ 30,875	17,801
Accumulated Amortization	(7,910)	(9,325)
Net Balance	$ 22,965	8,476
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	5 years 9 months 18 days
Software
Finite Lived Intangible Assets [Line Items]
Capitalized software development costs	$ 4,500	600
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	1,857	1,539
Accumulated Amortization	(839)	(902)
Net Balance	$ 1,018	637
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	$ 20,579	13,762
Accumulated Amortization	(5,802)	(8,111)
Net Balance	$ 14,777	5,651
Software Development | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	4 years 4 months 24 days
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 3,700	2,500
Accumulated Amortization	(896)	(312)
Net Balance	$ 2,804	$ 2,188
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	$ 2,350
Accumulated Amortization	(157)
Net Balance	$ 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	$ 2,389
Accumulated Amortization	(216)
Net Balance	$ 2,173
Other | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	11 years 10 months 24 days