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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Aug. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 29, 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) |  |  |  | 91,422,676 | 107,121,235 |  |
Common shares outstanding (in shares) |  |  |  | 91,422,676 | 107,121,235 |  |
Value of stock repurchased |  |  |  |  |  | $ 1,741 |
Share price (in dollars per share) |  |  |  |  |  |  | $ 18.45
Proceeds from issuance of common stock, net of offering costs |  |  | $ 248,900 | $ 177,796 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 3,450,000 |  | 3,450,000 | 0 |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 3,450,000 | 0 |  |
Preferred stock dividend percentage |  | 8.625% |  |  |  |  |
Preferred stock, unpaid dividends (in dollars per share) |  | $ 0.1079 |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 8,000,000 | 6,770,393 |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 8,000,000 | 6,770,393 |  |
Preferred stock dividend percentage |  |  |  |  | 8.00% |  |
Value of stock repurchased | $ 30,795 |  |  |  |  |  |
Share price (in dollars per share) | $ 25.04 |  |  |  |  |  |
Preferred stock, liquidation value (in dollars per share) | 25 |  |  |  |  |  |
Preferred stock, unpaid dividends (in dollars per share) | $ 0.04 |  |  |  |  |  |
Repurchases of common stock (in shares) | 1,229,607 |  |  |  |  |  |
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] |  |  |  |  |  |  |
Value of stock repurchased |  |  |  |  |  | $ 1 |
Repurchases of common stock (in shares) |  |  |  |  |  | 107,432 |
Common Stock [Member] | Follow-on public offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  | 13,800,000 | 10,500,000 |  |  |
Price per share of issued stock (in dollars per share) |  |  | $ 18.05 | $ 16.97 |  |  |
QHREAC [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Value of stock repurchased | $ 30,795 |  |  |  |  |  |
Share price (in dollars per share) | $ 18.44 |  |  |  |  |  |
Repurchases of common stock (in shares) | 1,670,000 |  |  |  |  |  |

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