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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 10, 2019 | Aug. 02, 2018 | Jun. 10, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 450,000,000 |  |  | 450,000,000 | 450,000,000
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) |  |  |  |  | 50,000,000 |  |  | 50,000,000 | 50,000,000
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01
Common stock, shares issued (in shares) |  |  |  |  | 153,531,597 |  |  | 153,531,597 | 133,853,565
Proceeds from issuance of common stock net of offering costs |  |  |  |  | $ 314,800 |  | $ 275,900 |  |
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  |  |  | $ 33,778 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  | 6,770,393 |  |  | 6,770,393 | 6,770,393
Preferred stock, shares outstanding (in shares) |  |  |  |  | 6,770,393 |  |  | 6,770,393 | 6,770,393
Preferred stock dividend percentage |  |  |  |  |  |  |  | 8.00% |
Unpaid dividends (in USD per share) |  |  |  |  | $ 0.50 | $ 0.50 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  | 0 |  |  | 0 | 6,900,000
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 |  |  | 0 | 6,900,000
Redemption of preferred stock (in shares) | 6,900,000 |  |  |  |  |  |  |  |
Preferred stock dividend percentage | 8.00% |  |  |  |  |  |  |  |
Redemption price (in USD per share) | $ 25.00 |  | $ 25.00 |  |  |  |  |  |
Unpaid dividends (in USD per share) |  |  | $ 0.2223 |  | $ 0.2223 | $ 0.50 |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 17,250,000 |  | 15,525,000 |  |
Conversions of convertible senior notes for common stock (in shares) |  |  |  |  |  | 1,967,361 |  |  |
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  |  |  | $ 20 |  |  |
2019 Notes | Convertible Debt | Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) |  |  |  |  |  | $ 17.17 |  |  |
Conversions of convertible senior notes for common stock (in shares) |  | 10,020,328 |  | 2,775,509 |  | 1,967,361 |  |  |
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  |  |  | $ 33,800 |  |  |
Follow On Public Offering | Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 17,250,000 |  | 15,525,000 |  |
Shares issued, price per share (in dollars per share) |  |  |  |  | $ 18.27 |  | $ 17.77 | $ 18.27 |

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