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Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Apr. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Issuance of common stock |  |  |  |  |  |  |
Net proceeds from issuance of common shares |  |  |  |  | $ 383,572 | $ 793,559 | $ 528,615
Common stock |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |
Shares issued | 6,500,000 | 11,500,000 | 5,500,000 | 13,800,000 |  |  |
Underwriting discounts and offering costs | $ 12,100 | $ 22,000 | $ 1,400 | $ 22,800 |  |  |
Net proceeds from issuance of common shares | $ 383,600 | $ 517,100 | $ 276,400 | $ 528,600 |  |  |

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