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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts receivable, allowance $ 63,098 $ 74,660
Treasury stock, shares 530,944 487,126
Common Class A [Member]
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 24,106,139 24,118,358
Common Class B [Member]
    
Common stock, par value $ 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]
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 58,967,502 58,967,502