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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Common stock, shares authorized (in shares) |  | 450,000,000 | 450,000,000
Common stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) |  | 50,000,000 | 50,000,000
Preferred stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01
Common stock, shares issued (in shares) |  | 123,020,301 | 107,121,235
Common shares outstanding (in shares) |  | 123,020,301 | 107,121,235
Proceeds from issuance of common stock, net of offering costs | $ 275.9 |  |
Series B Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) |  | 6,770,393 | 6,770,393
Preferred stock, shares outstanding (in shares) |  | 6,770,393 | 6,770,393
Preferred stock dividend percentage |  | 8.00% |
Series C Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) |  | 6,900,000 | 6,900,000
Preferred stock, shares outstanding (in shares) |  | 6,900,000 | 6,900,000
Preferred stock dividend percentage |  | 8.00% |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of stock (in shares) |  | 15,525,000 |
Common Stock [Member] | Follow-on public offering [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of stock (in shares) | 15,525,000 |  |
Price per share of issued stock (in dollars per share) | $ 17.77 |  |

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