Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Net Balance	$ 119,349	$ 109,140
Amortization expense	19,600	15,200	$ 14,100
Reduction in depreciation and amortization	800
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	181,567	224,167
Accumulated Amortization	(62,218)	(115,027)
Net Balance	$ 119,349	109,140
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	$ 17,801	18,809
Accumulated Amortization	(9,325)	(8,998)
Net Balance	$ 8,476	9,811
Other Intangible Assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	6 years 4 months 24 days
Software and Software Development Costs
Finite Lived Intangible Assets [Line Items]
Software development costs, not yet completed	$ 600	400
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	1,539	3,102
Accumulated Amortization	(902)	(1,782)
Net Balance	$ 637	1,320
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	10 years 2 months 12 days
Software Development
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 13,762	13,207
Accumulated Amortization	(8,111)	(7,154)
Net Balance	$ 5,651	6,053
Software Development | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	4 years 7 months 6 days
Non-compete
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 2,500	2,500
Accumulated Amortization	(312)	(62)
Net Balance	$ 2,188	$ 2,438
Non-compete | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets	10 years