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Issuances of Common Stock - At-the-Market (ATM) Programs (Details) - USD ($) $ in Thousands | 9 Months Ended | 37 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Oct. 31, 2017 | Sep. 30, 2015
At-the-market (ATM) Programs |  |  |  |  |
Proceeds from At-the-Market (ATM) program | $ 588,860 | $ 487,998 |  |  |
Common stock | At The Market Program |  |  |  |  |
At-the-market (ATM) Programs |  |  |  |  |
Shares issued (in shares) | 10,630,616 | 8,506,559 | 25,038,145 |  |
Proceeds from At-the-Market (ATM) program | $ 588,900 | $ 488,000 | $ 1,400,000 |  |
Common stock | At The Market Program | Maximum |  |  |  |  |
At-the-market (ATM) Programs |  |  |  |  |
Shares authorized (in shares) |  |  |  | 17,000,000 | 12,000,000

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