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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Condensed Consolidated Balance Sheets    
Preferred stock, shares authorized 500,000 500,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized shares 120,000,000 120,000,000
Common stock, shares issued 39,247,833 39,328,503
Common stock, shares outstanding 39,247,833 39,328,503