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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 07, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Preferred stock, shares authorized |  | 5,000,000 | 5,000,000
Preferred stock, shares outstanding |  | 0 | 0
Common stock, shares authorized |  | 400,000,000 | 400,000,000
Public issuance of common stock |  | 4,945,000 |
Net proceeds from sale of stock |  | $ 649,387 |
Public Offering |  |  |
Public issuance of common stock | 4,945,000 |  |
Per share price | $ 131.46 |  |
Net proceeds from sale of stock | $ 649,400 |  |
Over-Allotment Option | Maximum |  |  |
Underwriter purchase option period | 30 days |  |
Shares available for purchase by underwriter (in shares) | 741,750 |  |

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