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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
At-the-Market (ATM) Program |  |  |  |
Gross proceeds |  |  | $ 689,641 | $ 588,860
ATM Program |  |  |  |
At-the-Market (ATM) Program |  |  |  |
Shares remaining for future issuance (in shares) | 11,083,783 |  | 11,083,783 |
Common stock | ATM Program |  |  |  |
At-the-Market (ATM) Program |  |  |  |
Shares of common stock issued (in shares) | 7,663,383 | 5,055,343 | 9,370,078 | 10,630,616
Gross proceeds | $ 570,300 | $ 290,900 | $ 694,400 | $ 588,900
Common stock | ATM Program | Maximum |  |  |  |
At-the-Market (ATM) Program |  |  |  |
Authorized common shares to be issued (in shares) | 28,961,855 |  | 28,961,855 |

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- Definition At The Market Equity Distribution Program, Authorized Shares The number of shares authorized by an entity's Board of Directors under their At-the-market equity distribution program. + References No definition available. + Details
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