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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