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Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2016 | Apr. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Issuance of common stock |  |  |  |
Net proceeds from issuance of common shares |  |  | $ 383,525 | $ 276,430
Common stock |  |  |  |
Issuance of common stock |  |  |  |
Shares issued | 6,500,000 | 5,500,000 |  |
Underwriting discounts and offering costs | $ 12,100 | $ 1,400 |  |
Net proceeds from issuance of common shares | $ 383,500 | $ 276,400 |  |

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