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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts $ 829 $ 1,990
Fixed assets, accumulated depreciation $ 103,561 $ 94,432
Preferred shares, issued 0 0
Class A Shares
    
Common stock, no par value $ 0 $ 0
Common stock, shares issued 29,135,054 28,758,734
Class B Shares
    
Common stock, no par value $ 0 $ 0
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503