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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Accounts receivable, allowance for doubtful accounts $ 862 $ 851
Fixed assets, accumulated depreciation $ 106,910 $ 101,928
Preferred shares, issued      
Shares to be issued, shares 28,000  
Class A Shares
    
Common stock, no par value      
Common stock, shares issued 30,063,937 29,277,408
Class B Shares
    
Common stock, no par value      
Common stock, shares issued 2,503 2,503
Common stock, shares outstanding 2,503 2,503