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Consolidated Balance Sheet (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Balance Sheet Parenthetical [Abstract]    
Allowances for receivables $ 55,917 $ 63,098
Class Of Stock Line Items    
Treasury stock shares 1,504,618 530,944
Common Class A [Member]
    
Class Of Stock Line Items    
Common stock par value per share $ 0.001  
Common stock shares authorized 400,000,000 400,000,000
Common stock shares issued 24,649,377 24,106,139
Common Class B [Member]
    
Class Of Stock Line Items    
Common stock par value per share $ 0.001  
Common stock shares authorized 150,000,000 150,000,000
Common stock shares issued 555,556 555,556
Common Class C [Member]
    
Class Of Stock Line Items    
Common stock par value per share $ 0.001  
Common stock shares authorized 100,000,000 100,000,000
Common stock shares issued 58,967,502 58,967,502