Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Intangible Assets

Summary of the changes in the carrying amount of goodwill and franchise value

	Goodwill			Franchise Value
Balance — December 31, 2010	$	791,327		$	196,883
Additions	107,498			29,491
Foreign currency translation	(1,520		)	(473		)
Balance — December 31, 2011	897,305			225,901
Additions	61,713			53,407
Foreign currency translation	15,702			3,984
Balance — December 31, 2012	$	974,720		$	283,292