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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 for doubtful accounts (in dollars) $ 851 $ 1,990
Preferred stock, shares issued 0 0
Common stock issuable shares issuable 28,000  
Common Class A [Member]
    
Common stock, shares issued 29,277,408 28,758,734
Common stock, shares outstanding 29,277,408 28,758,734
Common Class B [Member]
    
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503