Goodwill, Franchise Rights and Other Intangibles Intangibles (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net	$ 13,473,000	$ 17,255,000
Amortization expense	8,226,000	8,024,000	8,342,000
Trademarks
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net	1,000,000
Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net	9,800,000	13,500,000
Finite-Lived Intangible Assets, Remaining Amortization Period	10
Amortization expense	3,700,000	3,600,000	4,200,000
Finite-Lived Intangible Assets, Accumulated Amortization	(74,000,000)	(70,200,000)
Finite-Lived Intangible Assets, Future Amortization Expense, Five Succeeding Fiscal Years
2013	3,500,000
2014	3,300,000
2015	2,300,000
2016	300,000
2017	200,000
Trademarks
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net	3,700,000	3,800,000
Amortization expense	500,000	500,000	600,000
Finite-Lived Intangible Assets, Accumulated Amortization	(6,900,000)	(6,400,000)
Finite-Lived Intangible Assets, Future Amortization Expense, Five Succeeding Fiscal Years
2013	500,000
2014	500,000
2015	400,000
2016	400,000
2017	$ 300,000
Minimum | Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life, Minimum	5 years
Maximum | Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life, Minimum	25 years