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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 19,000,000 19,000,000
Common stock, shares issued (in shares) 16,546,914 16,468,369
Treasury stock, at cost (in shares) 104,368 3,147