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Equity - At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands | 9 Months Ended | 25 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
At-the-market (ATM) Program |  |  |
Procceds from At-the-Market (ATM) program | $ 487,998 | $ 85,780 |
ATM |  |  |
At-the-market (ATM) Program |  |  |
Share issuances, net of costs (in shares) | 8,506,559 | 1,312,269 | 12,000,000
Procceds from At-the-Market (ATM) program | $ 488,000 | $ 85,800 | $ 691,100

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