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Issuances of Common Stock - At-the-Market (ATM) Programs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 46 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019
At-the-Market (ATM) Programs |  |  |  |  |
Proceeds from At-the-Market (ATM) program |  |  | $ 122,155 | $ 297,983 |
Current ATM Program |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Shares remaining for future issuance (in shares) | 18,747,166 |  | 18,747,166 |  | 18,747,166
Common stock | ATM Programs |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Share issuances (in shares) | 1,706,695 | 5,575,273 | 1,706,695 | 5,575,273 | 35,252,834
Proceeds from At-the-Market (ATM) program | $ 124,200 | $ 298,000 | $ 124,200 | $ 298,000 | $ 2,100,000
Common stock | Current ATM Program | Maximum |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Shares authorized (in shares) | 28,961,855 |  | 28,961,855 |  | 28,961,855

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