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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Allowances for receivables $ 45,123 $ 48,401
Class of Stock [Line Items]    
Treasury stock shares (1,411,946) (1,402,227)
Common Class A [Member]
    
Class of Stock [Line Items]    
Common stock par value per share $ 0.001 $ 0.001
Common stock shares authorized 400,000,000 400,000,000
Common stock shares issued 29,718,780 29,504,379
Common Class B [Member]
    
Class of Stock [Line Items]    
Common stock par value per share $ 0.001 $ 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 $ 0.001
Common stock shares authorized 100,000,000 100,000,000
Common stock shares issued 58,967,502 58,967,502