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Debt Obligations - Convertible Senior Unsecured Notes (Details)
 1 Months Ended 12 Months Ended
Aug. 31, 2021
USD ($)
Jul. 31, 2021
USD ($)
shares
Apr. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
May 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
$ / shares
Debt Obligations                            
Cash paid for the exchange of convertible notes                       $ 22,336,000    
Notes settled with cash                     $ 14,300,000   $ 231,940,000  
Gain (loss) on real estate                     (3,374,000) (3,546,000) (7,439,000)  
Total                     12,132,490,000      
Convertible Senior Unsecured Notes                            
Debt Obligations                            
Junior subordinated notes                     $ 264,000,000 $ 278,300,000    
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed                     100.00%      
Maturity period (in years)                     10 months 2 days 1 year 9 months 7 days    
Unamortized Debt Discount                     $ 2,520,000 $ 5,636,000    
Unamortized Deferred Financing Fees                     2,095,000 4,691,000    
Total                     259,385,000 267,973,000    
Net Carrying Value, Equity Component                     8,684,000 9,962,000    
Interest expense                     18,600,000 20,000,000.0 28,300,000  
Interest expense related to cash coupon                     12,800,000 13,400,000 13,500,000  
Debt discount                     3,200,000 3,000,000.0 6,800,000  
Deferred fees expensed as interest expense                     $ 2,600,000 $ 3,600,000 $ 7,900,000  
Cost of the notes (as a percent)                     6.71% 6.75%    
Senior Unsecured Notes                            
Debt Obligations                            
Junior subordinated notes                     $ 1,295,750,000 $ 670,750,000    
Unamortized Deferred Financing Fees                     15,200,000 7,900,000    
8.00% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes         $ 40,500,000           $ 70,750,000 70,750,000    
Proceeds from issued debt       $ 30,300,000 $ 69,600,000                  
Interest rate (as a percent)         8.00%           8.00%      
4.50% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes $ 270,000,000.0         $ 275,000,000.0         $ 275,000,000 275,000,000    
Proceeds from issued debt $ 265,800,000         $ 271,800,000                
Interest rate (as a percent) 4.50%         4.50%         4.50%      
5.25% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes   $ 14,300,000                        
Interest rate (as a percent)   5.25%                 5.25%      
Notes settled with cash   $ 14,300,000                 $ 228,700,000      
Common stock exchanged (in shares) | shares   386,459                        
4.75% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes             $ 110,000,000.0       $ 1,000 $ 1,000   $ 264,000,000.0
Proceeds from issued debt             $ 108,200,000              
Interest rate (as a percent)             4.75%       4.75%     4.75%
Proceeds received, net of estimated issuance costs                     $ 256,500,000      
Common stock exchanged (in shares) | shares                     56.8560      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes                       56.1695    
Conversion price per share of common stock | $ / shares                     $ 17.59     $ 17.80
4.75% Convertible Notes | Over-Allotment Option                            
Debt Obligations                            
Junior subordinated notes                           $ 34,000,000.0
5.75% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes               $ 90,000,000.0     $ 90,000,000 $ 90,000,000    
Proceeds from issued debt               $ 88,200,000            
Interest rate (as a percent)               5.75%     5.75%      
4.75% and 5.25% Convertible Notes                            
Debt Obligations                            
Notes and accrued interest settled                     $ 233,100,000      
Common stock exchanged (in shares) | shares                     4,478,315      
Gain (loss) on real estate                       7,300,000    
Inducement charge                       1,100,000    
5.625% Notes                            
Debt Obligations                            
Junior subordinated notes                   $ 100,000,000.0 $ 125,000,000 125,000,000    
Proceeds from issued debt                 $ 25,000,000.0 $ 122,300,000        
Interest rate (as a percent)                   5.625% 5.625%      
5.00% Convertible Notes                            
Debt Obligations                            
Junior subordinated notes     $ 175,000,000.0               $ 175,000,000      
Proceeds from issued debt     $ 172,300,000                      
Interest rate (as a percent)     5.00%               5.00%      
Junior subordinated notes                            
Debt Obligations                            
Junior subordinated notes                     $ 154,336,000 154,336,000    
Deferred fees expensed as interest expense                     $ 1,700,000 $ 1,800,000