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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
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) 400,000,000 400,000,000
Common stock, shares issued (in shares) 199,593,343 196,815,254
Common stock, shares outstanding (in shares) 192,128,586 192,356,051
Treasury stock, shares (in shares) 7,464,757 4,459,203
Restricted stock    
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, unvested restricted shares (in shares) 7,252,459 5,756,435