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Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2017 | May 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Issuance of Common Stock |  |  |  |
Net proceeds from issuance of common shares |  |  | $ 704,938 | $ 383,572
Common stock |  |  |  |
Issuance of Common Stock |  |  |  |
Shares issued | 11,850,000 | 6,500,000 |  |
Underwriting discounts and offering costs | $ 29,700 | $ 12,100 |  |
Net proceeds from issuance of common shares | $ 704,900 | $ 383,600 |  |

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