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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful receivable $ 2,818 $ 5,370
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 1,600,000,000 1,600,000,000
Common stock, shares issued 130,030,138 120,661,808
Common stock, shares outstanding 130,030,138 120,661,808
Class B Common Stock
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 12,799,999 12,799,999
Common stock, shares outstanding 12,799,999 12,799,999