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Issuances of Common Stock - At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
At-the-Market (ATM) Program |  |  |  |
Gross proceeds |  |  | $ 449,959 | $ 94,076
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) | 9,088,433 |  | 9,088,433 |
Common stock | ATM Program |  |  |  |
At-the-Market (ATM) Program |  |  |  |
Shares of common stock issued (in shares) | 6,589,598 | 1,511,149 | 6,589,598 | 1,511,149
Gross proceeds | $ 454,800 | $ 95,700 | $ 454,800 | $ 95,700

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