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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Intangible Assets      
Goodwill, Accumulated impairment loss     $ 606,349
Franchise value, Accumulated impairment loss     37,110
Summary of the changes in the carrying amount of goodwill and franchise value      
Goodwill, Beginning Balance 897,305 791,237  
Goodwill, additions 61,713 107,498  
Goodwill, foreign currency translation 15,702 (1,520)  
Goodwill, Ending Balance 974,720 897,305  
Franchise value, Beginning Balance 225,901 196,883  
Franchise value, Additions 53,407 29,491  
Franchise value, foreign currency translation 3,984 (473)  
Franchise value, Ending Balance $ 283,292 $ 225,901