Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Intangible Assets [Abstract]

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

	Goodwill			Franchise Value
Balance — December 31, 2009	$	796,278		$	201,463
Additions		17,199			4,222
Foreign currency translation		(12,856	)		(2,577	)
Balance — December 31, 2010		800,621			203,108
Additions		107,498			29,491
Foreign currency translation		(1,527	)		(605	)
Balance — December 31, 2011	$	906,592		$	231,994