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Issuances of Common Stock - At-the-Market (ATM) Programs (Details) - USD ($) $ in Thousands | 12 Months Ended | 39 Months Ended | 40 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2018 | Dec. 31, 2018
At-the-Market (ATM) Programs |  |  |  |  |
Proceeds from At-the-Market (ATM) program | $ 1,125,364 | $ 621,697 | $ 166,781 |  |
ATM Programs |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Share issuances, net of costs (in shares) | 19,138,610 | 10,914,088 |  |  | 33,546,139
Proceeds from At-the-Market (ATM) program | $ 1,100,000 | $ 621,700 |  |  | $ 2,000,000
Shares remaining for future issuance (in shares) | 20,453,861 |  |  |  | 20,453,861
Prior ATM Program |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Share issuances, net of costs (in shares) |  |  |  | 25,038,145 |
Current ATM Program | Maximum |  |  |  |  |
At-the-Market (ATM) Programs |  |  |  |  |
Shares authorized (in shares) |  |  |  | 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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