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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Common stock, par value (in usd per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 200,000,000 | 200,000,000
Common stock, shares outstanding (in shares) | 55,135,788 | 57,564,493
Treasury stock, shares (in shares) | 19,372,735 | 16,207,740

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