Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 125,000,000 125,000,000
Common stock, shares issued 40,653,337 40,377,021
Treasury stock, shares 7,891,250 7,891,250