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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 7 Months Ended
Jun. 10, 2019
Aug. 02, 2018
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 15, 2019
Dec. 31, 2019
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)     148,326,806       148,326,806     153,537,296
Common stock, shares, outstanding (in shares)     148,326,806       148,326,806     153,537,296
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
Unpaid dividends (in dollars per share)     $ 0.50 $ 0.50 $ 0.50 $ 0.50        
Increase to additional paid in capital as a result of conversion of 2019 Notes           $ 33,778        
Proceeds from issuance of common stock net of offering costs         $ 314,800          
Shares repurchased (in shares)     5,495,976 300,000     5,795,976      
Share repurchase, average price per share (in dollars per share)     $ 7.96 $ 8.11     $ 7.96      
Common Stock                    
Class of Stock [Line Items]                    
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        
Issuance of common stock (in shares)         17,250,000          
Common Stock | Follow On Public Offering                    
Class of Stock [Line Items]                    
Shares issued, price per share (in dollars per share)         $ 18.27     $ 18.27    
Issuance of common stock (in shares)         17,250,000          
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  
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]                    
Preferred stock, shares issued (in shares)     6,770,393       6,770,393      
Preferred stock, shares outstanding (in shares)     6,770,393       6,770,393      
Preferred stock dividend percentage             8.00%      
Unpaid dividends (in dollars per share)     $ 0.50   $ 0.50   $ 1.00 1.00    
Series C Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock dividend percentage 8.00%                  
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       $ 0.2223     $ 0.7223