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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Serial preferred stock, shares authorized 5,000,000 5,000,000
Serial preferred stock, outstanding      
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 26,313,000 26,237,000
Common stock, shares outstanding 24,767,000 24,691,000
Treasury stock, shares 1,546,000 1,546,000