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Issuances of Common Stock - Issuances of Common Stock in an Overnight Offering (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Issuance of Common Stock |  |  |
Net proceeds from issuance of common shares |  | $ 0 | $ 704,938
Common stock |  |  |
Issuance of Common Stock |  |  |
Shares issued (in shares) | 11,850,000 |  |
Underwriting discounts and offering costs | $ 29,800 |  |
Net proceeds from issuance of common shares | $ 704,900 |  |

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