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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts $ 29,202 $ 33,259
Preferred stock par value $ 0.0001 $ 0.0001
Preferred stock authorized 7,500,000 7,500,000
Preferred stock issued 0 0
Preferred stock outstanding 0 0
Common Class A [Member]
    
Common stock par value $ 0.0001 $ 0.0001
Common stock authorized 80,000,000 80,000,000
Common stock issued 23,332,532 23,020,215
Common stock outstanding 23,332,410 23,020,215
Common Class B [Member]
    
Common stock par value $ 0.0001 $ 0.0001
Common stock authorized 20,000,000 20,000,000
Common stock issued 5,149,771 5,164,765
Common stock outstanding 5,148,854 5,164,765
Treasury Class-A [Member]
    
Treasury Stock, Shares 122 0
Treasury Class B [Member]
    
Treasury Stock, Shares 917 0