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Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Condensed Balance Sheets (Parenthetical) [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in share) 10,000,000 10,000,000
Preferred stock, shares issued (in share) 0 0
Preferred stock, shares outstanding (in share) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in share) 70,000,000 70,000,000
Common stock, shares issued (in share) 43,204,164 43,028,146
Common stock, shares outstanding (in share) 42,993,732 42,932,460
Treasury stock, (in shares) 28,100 28,100