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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts receivable, allowance for doubtful accounts (in dollars) $ 1,046 $ 851
Fixed assets, accumulated depreciation (in dollars) $ 109,086 $ 101,928
Common stock issuable shares issuable 28,000  
Preferred stock, shares issued 0 0
Common Class A [Member]
    
Common stock, shares issued 31,019,906 29,277,408
Common stock, shares outstanding 31,019,906 29,277,408
Common Class B [Member]
    
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503