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Issuances of Common Stock - At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
At-the-Market (ATM) Program |  |  |  |
Gross proceeds |  |  | $ 442,157 | $ 689,641
ATM Program |  |  |  |
At-the-Market (ATM) Program |  |  |  |
At-the-Market equity distribution program, authorized shares (in shares) | 33,402,405 |  | 33,402,405 |
Shares remaining for future issuance (in shares) | 26,354,637 |  | 26,354,637 |
Common stock | ATM Program |  |  |  |
At-the-Market (ATM) Program |  |  |  |
Shares of common stock issued (in shares) | 5,536,619 | 7,663,383 | 7,047,768 | 9,370,078
Gross proceeds | $ 346,500 | $ 570,300 | $ 442,200 | $ 694,400

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