Franchise Rights and Other Identifiable Intangibles - Components of Franchise Rights and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net of accumulated amortization	$ 8,912	$ 9,953
Franchise rights, net of accumulated amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net of accumulated amortization	2,753	6,069
Other identifiable intangible assets, net of accumulated amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Franchise rights and other identifiable intangibles, net of accumulated amortization	$ 6,159	$ 3,884