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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 accounts receivable (in dollars) $ 1,581 $ 851
Preferred stock, shares issued 0 0
Shares to be issued, shares 28,000 28,000
Common Class A [Member]
    
Common stock, shares issued 31,074,168 29,277,408
Common stock, shares outstanding 31,074,168 29,277,408
Common Class B [Member]
    
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503