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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 10, 2019 | Aug. 02, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 15, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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) |  |  |  |  |  |  | 139,295,867 | 153,537,296 |
Common stock, shares, outstanding (in shares) |  |  |  |  |  |  | 139,295,867 | 153,537,296 |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  | 6,770,393 | 6,770,393 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 6,770,393 | 6,770,393 |
Unpaid dividends (in dollars per share) |  |  |  |  |  |  | $ 2.00 | $ 2.72 | $ 4.00
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  |  |  |  |  | $ 33,778 | $ 108
Proceeds from issuance of common stock net of offering costs |  |  | $ 314,800 |  | $ 275,900 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock (in shares) |  |  |  |  |  |  |  | 1,967,361 | 10,828,475
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  |  |  |  |  | $ 20 | $ 108
Issuance of common stock (in shares) |  |  |  |  |  |  |  | 17,250,000 | 15,525,000
Common Stock | Follow On Public Offering |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) |  |  | $ 18.27 |  | $ 17.77 |  |  |  |
Issuance of common stock (in shares) |  |  | 17,250,000 |  | 15,525,000 |  |  |  |
2019 Notes | Convertible Debt | Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversions of convertible senior notes for common stock (in shares) |  | 10,020,328 |  | 1,967,361 |  | 2,775,509 |  |  | 10,828,475
Shares issued, price per share (in dollars per share) |  |  |  | $ 17.17 |  |  |  |  |
Increase to additional paid in capital as a result of conversion of 2019 Notes |  |  |  | $ 33,800 |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Unpaid dividends (in dollars per share) |  |  |  |  |  |  | $ 2.00 | $ 2.00 | $ 2.00
Series C Preferred Stock(2) |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Redemption of preferred stock (in shares) | 6,900,000 |  |  |  |  |  |  |  |
Redemption price (in dollars per share) | $ 25.00 |  |  |  |  |  |  |  |
Unpaid dividends (in dollars per share) | $ 0.2223 |  |  |  |  |  |  | $ 0.7223 | $ 2.00

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