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Issuances of Common Stock - Issuance of Common Stock in an Overnight Offering (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Issuance of Common Stock |  |  |  |  |
Proceeds from shares issuances, net |  |  | $ 845,061 | $ 0 | $ 704,938
Overnight Offering | Common stock |  |  |  |  |
Issuance of Common Stock |  |  |  |  |
Shares of common stock issued (in shares) | 12,650,000 | 11,850,000 |  | 0 |
Underwriting discounts and other offering costs | $ 31,000 | $ 29,800 |  |  |
Proceeds from shares issuances, net | $ 845,100 | $ 704,900 |  |  |

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