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Equity - At-the-Market (ATM) Programs (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended | 28 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | May 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Oct. 31, 2017 | Sep. 30, 2015
At-the-market (ATM) Programs |  |  |  |  |  |  |  |  |  |
Procceds from At-the-Market (ATM) program |  |  |  |  | $ 621,697 | $ 166,781 | $ 36,348 |  |  |
Common stock |  |  |  |  |  |  |  |  |  |
At-the-market (ATM) Programs |  |  |  |  |  |  |  |  |  |
Share issuances, net of costs (in shares) | 11,850,000 | 6,500,000 | 11,500,000 | 5,500,000 |  |  |  |  |  |
ATM | Common stock |  |  |  |  |  |  |  |  |  |
At-the-market (ATM) Programs |  |  |  |  |  |  |  |  |  |
Share issuances, net of costs (in shares) |  |  |  |  | 10,914,088 | 2,779,140 |  | 14,407,529 |  |
Procceds from At-the-Market (ATM) program |  |  |  |  | $ 621,700 | $ 166,800 |  | $ 824,800 |  |
ATM | Maximum | Common stock |  |  |  |  |  |  |  |  |  |
At-the-market (ATM) Programs |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  |  | 17,000,000 | 12,000,000

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