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Debt Obligations - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
extension
$ / shares
Jan. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Obligations            
Junior subordinated notes to subsidiary trust issuing preferred securities $ 144,096,000 $ 144,096,000   $ 144,096,000   $ 143,896,000
Debt, Wtd. Avg. Rate 7.72% 7.72%   7.72%    
5.75% Notes            
Debt Obligations            
Interest rate 5.75% 5.75%   5.75%    
Debt, Wtd. Avg. Rate 5.75% 5.75%   5.75%   5.75%
7.50% convertible notes            
Debt Obligations            
Interest rate 7.50% 7.50%   7.50%    
Convertible senior unsecured notes            
Debt Obligations            
Percentage of notes required to be repurchased if the agreement is fundamentally changed       100.00%    
Interest expense       $ 6,100,000 $ 6,100,000  
Interest expense related to cash coupon       5,400,000 5,400,000  
Deferred fees expensed as interest expense       $ 700,000 $ 700,000  
Weighted average cost of notes, percentage 8.43% 8.43%   8.43%   8.42%
7.50% convertible notes            
Debt Obligations            
Interest rate 7.50% 7.50%   7.50%    
Conversion rate of the notes to common stock, per $1,000 principal amount of notes 0.0605723          
Conversion price per share of common stock (in dollars per share) | $ / shares $ 16.51 $ 16.51   $ 16.51    
Junior subordinated notes            
Debt Obligations            
Weighted average note rate including certain fees and costs, percentage 8.56% 8.56%   8.56%   8.56%
Deferred fees expensed as interest expense       $ 1,400,000   $ 1,500,000
Junior subordinated notes to subsidiary trust issuing preferred securities $ 144,100,000 $ 144,100,000   144,100,000   143,900,000
Deferred amount due at maturity $ 8,800,000 $ 8,800,000   $ 8,800,000   $ 9,000,000
Debt, Wtd. Avg. Rate 8.48% 8.48%   8.48%   8.48%
Amount payable on default of senior debt $ 0 $ 0   $ 0    
CLO 14            
Debt Obligations            
Debt paid down       $ 122,100,000    
Debt, Wtd. Avg. Rate 6.90% 6.90%   6.90%   6.82%
CLO 15            
Debt Obligations            
Debt paid down       $ 92,200,000    
Debt, Wtd. Avg. Rate 6.84% 6.84%   6.84%   6.82%
Q Series securitization            
Debt Obligations            
Weighted average note rate including certain fees and costs, percentage 8.06% 8.06%   8.06%   7.99%
Debt paid down       $ 31,800,000    
Debt, Wtd. Avg. Rate 7.34% 7.34%   7.34%   7.38%
Structured Business            
Debt Obligations            
Weighted average note rate including certain fees and costs, percentage 8.33% 8.33%   8.33%   8.26%
Leverage on loans and investment portfolio financed through credit and repurchase facilities, excluding securities repurchase facility and working capital facility 67.00% 67.00%   67.00%   69.00%
Debt, Wtd. Avg. Rate 7.84% 7.84%   7.84%    
Structured Business | Minimum            
Debt Obligations            
Weighted average loan spread     0.0550      
Structured Business | $200M credit facility            
Debt Obligations            
Maximum borrowing capacity           $ 225,000,000
Structured Business | $25M credit facility            
Debt Obligations            
Maximum borrowing capacity           $ 25,000,000
Structured Business | $150M credit facility            
Debt Obligations            
Maximum borrowing capacity     $ 150,000,000      
Length of extension option     1 year      
Structured Business | $150M credit facility | SOFR            
Debt Obligations            
Variable rate, spread     3.00%      
Structured Business | $450M repurchase facility            
Debt Obligations            
Maximum borrowing capacity $ 450,000,000 $ 450,000,000   $ 450,000,000    
Structured Business | $350M repurchase facility            
Debt Obligations            
Maximum borrowing capacity $ 350,000,000 $ 350,000,000   $ 350,000,000    
Maturity extensions exercised | extension   1        
Number of extension options | extension   2        
Length of extension option 1 year 1 year   1 year    
Debt, Wtd. Avg. Rate 7.54% 7.54%   7.54%    
Structured Business | $250M credit facility            
Debt Obligations            
Maximum borrowing capacity $ 250,000,000 $ 250,000,000   $ 250,000,000    
Variable rate, spread   3.25%        
Length of extension option 1 year 1 year   1 year    
SOFR floor, percentage   2.50%        
Debt, Wtd. Avg. Rate 8.71% 8.71%   8.71%    
Structured Business | $1B repurchase facility            
Debt Obligations            
Maximum borrowing capacity $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000    
Debt, Wtd. Avg. Rate 8.39% 8.39%   8.39%    
Structured Business | $1B repurchase facility | SOFR            
Debt Obligations            
Maximum borrowing capacity $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000