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Common stock offering | 9 Months Ended
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Sep. 30, 2018
Common stock offering |
Common stock offering | 11. Common stock offering On September 7, 2017, we completed a public offering of 4,945,000 shares of our authorized but unissued common stock pursuant to an effective shelf registration statement. The underwriter had an option for a period of 30 days to purchase a maximum of 741,750 additional shares of our common stock, which expired unexercised. We sold the shares of common stock to the underwriter at a price of $131.46 per share, resulting in net proceeds, after deducting expenses related to the offering, of approximately $649.4 million.

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