Intangible Assets and Goodwill - Components of Company's Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 3,656,000	$ 3,549,000	$ 7,170,000	$ 7,098,000
Franchise agreements
Finite Lived Intangible Assets [Line Items]
Initial Cost	168,067,000		168,067,000		$ 162,438,000
Accumulated Amortization	(107,474,000)		(107,474,000)		(100,499,000)
Net Balance	60,593,000		$ 60,593,000		61,939,000
Franchise agreements | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			12 years 8 months 12 days
Other intangible assets
Finite Lived Intangible Assets [Line Items]
Initial Cost	14,773,000		$ 14,773,000		13,870,000
Accumulated Amortization	(8,531,000)		(8,531,000)		(8,929,000)
Net Balance	6,242,000		$ 6,242,000		4,941,000
Other intangible assets | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			6 years 4 months 24 days
Software
Finite Lived Intangible Assets [Line Items]
Initial Cost	11,759,000		$ 11,759,000		10,885,000
Accumulated Amortization	(6,843,000)		(6,843,000)		(7,325,000)
Net Balance	4,916,000		$ 4,916,000		3,560,000
Software | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			3 years 1 month 6 days
Trademarks
Finite Lived Intangible Assets [Line Items]
Initial Cost	3,014,000		$ 3,014,000		2,985,000
Accumulated Amortization	(1,688,000)		(1,688,000)		(1,604,000)
Net Balance	1,326,000		$ 1,326,000		1,381,000
Trademarks | Weighted Average
Finite Lived Intangible Assets [Line Items]
Useful life of intangible assets			14 years 4 months 24 days
Software Development
Finite Lived Intangible Assets [Line Items]
Initial Cost	$ 4,057,000		$ 4,057,000		$ 3,165,000