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v3.3.1.900

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 21, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 450,000,000 | 450,000,000 |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.01 | $ 0.01 |
Preferred stock, shares authorized |  |  |  |  | 50,000,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  |
Common stock shares issued |  |  |  |  | 67,195,252 | 46,900,442 |
Common stock, shares outstanding |  |  |  |  | 67,195,252 | 46,900,442 |
Proceeds from issuance of common stock, net of offering costs |  |  | $ 193,148 | $ 158,439 |  |  |
Payments of stock offering costs |  |  |  |  | $ 987 | $ 389 | $ 824
Repurchase of common stock |  |  |  |  | $ 1,741 | $ 0 | $ 0
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend percentage |  |  |  |  | 8.625% |  |
Preferred stock shares issued |  |  |  |  | 3,450,000 | 3,450,000 |
Preferred stock, shares outstanding |  |  |  |  | 3,450,000 | 3,450,000 |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock dividend percentage |  |  |  |  | 8.00% |  |
Preferred stock shares issued |  |  |  |  | 8,000,000 |  |
Preferred stock, shares outstanding |  |  |  |  | 8,000,000 |  |
Series B Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of stock (shares) | 8,000,000 |  |  |  |  |  |
Price per share of issued stock (in USD per share) | $ 24.71 |  |  |  |  |  |
Proceeds from private placement issuance | $ 346,855 |  |  |  |  |  |
Payments of stock offering costs | $ 500 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchases of common stock (shares) |  | 107,432 |  |  | 107,432 |  |
Stock repurchases during period, price per share (in USD per share) |  | $ 16.20 |  |  |  |  |
Repurchase of common stock |  | $ 1,741 |  |  |  |  |
Common Stock [Member] | Follow-on public offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of stock (shares) |  |  | 11,500,000 | 9,706,000 |  |  |
Price per share of issued stock (in USD per share) |  |  | $ 16.82 | $ 16.35 |  |  |
Common Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of stock (shares) | 8,823,529 |  |  |  |  |  |
Price per share of issued stock (in USD per share) | $ 17.00 |  |  |  |  |  |

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