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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Summary of the changes in the carrying amount of goodwill and franchise value  
Goodwill, Beginning Balance $ 903,721
Goodwill, additions 35,343
Goodwill, foreign currency translation 13,784
Goodwill, Ending Balance 952,848
Franchise value, Beginning Balance 228,460
Franchise value, Additions 26,343
Franchise value, foreign currency translation 3,308
Franchise value, Ending Balance $ 258,111