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Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | May 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Issuance of Common Stock |  |  |  |  |  |  |
Net proceeds from issuance of common shares |  |  |  |  | $ 704,938 | $ 383,572 | $ 793,559
Common stock |  |  |  |  |  |  |
Issuance of Common Stock |  |  |  |  |  |  |
Shares issued | 11,850,000 | 6,500,000 | 11,500,000 | 5,500,000 |  |  |
Underwriting discounts and offering costs | $ 29,800 | $ 12,100 | $ 22,000 | $ 1,400 |  |  |
Net proceeds from issuance of common shares | $ 704,900 | $ 383,600 | $ 517,100 | $ 276,400 |  |  |

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