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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Accounts receivable, allowance $ 450,000 $ 513,000
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 3,000 3,000
Preferred stock, issued      
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 120,000,000 120,000,000
Common stock, issued 76,117,721 76,123,940
Common stock, outstanding 64,015,737 64,361,491
Treasury stock, shares 9,210,521 8,864,767