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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 131,019,627 130,155,012
Common stock, shares outstanding (in shares) 128,591,226 127,726,611
Treasury stock, shares (in shares) 2,428,401 2,428,401
Restricted Stock [Member]
    
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, shares outstanding (in shares) 3,183,184 3,372,937