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Common stock offering (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Sep. 07, 2017 | Sep. 30, 2017
Common stock offering |  |
Net proceeds from sale of stock |  | $ 649,387
Public Offering |  |
Common stock offering |  |
Issuance of shares of Common Stock | 4,945,000 |
Per share price | $ 131.46 |
Net proceeds from sale of stock | $ 649,400 |
Maximum | Over-Allotment Option |  |
Common stock offering |  |
Underwriter purchase option period | 30 days |
Shares available for purchase by underwriter (in shares) | 741,750 |

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