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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares outstanding (in shares) 54,122,624 55,135,788
Treasury stock, shares (in shares) 20,923,252 19,372,735