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Related-Party Transactions - Management Agreement (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
d
qtr
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Related-Party Transactions      
Trading days period | d 5    
Granted (in shares) | shares 3,753,212    
Share-based expense $ 60,967,000 $ 59,448,000 $ 52,949,000
Manager Equity Plan      
Related-Party Transactions      
Granted (in shares) | shares 1,350,000    
S P T Management L L C      
Related-Party Transactions      
Base management fee 1.50%    
Management fee expense $ 97,200,000 89,800,000 87,300,000
Base management fee payable $ 25,300,000 23,500,000  
Core earnings period threshold 12 months    
Core earnings threshold percentage 8.00%    
Core earnings threshold, number of quarters | qtr 12    
Core earnings threshold amount $ 0    
Incentive fee calculation amount $ 0    
Incentive fee calculation multiplication factor 20.00%    
Rolling period 12 months    
Stock value factor 8.00%    
Incentive fee quarters period | qtr 3    
Percentage of installment payable in shares 50.00%    
Stock ownership limit 9.80%    
Accrued incentive fee $ 13,700,000 35,300,000 35,700,000
Unpaid incentive fee 3,500,000 12,700,000  
Executive compensation expense 6,300,000 5,600,000 $ 8,000,000.0
Unpaid reimbursable compensation $ 2,800,000 $ 2,700,000  
Percentage of votes needed to terminate agreement 66.67%    
Termination period notice 180 days    
Termination fee multiplier 3    
Termination fee period quarters | qtr 8    
Termination fee payable $ 0    
Termination period without notice 30 days    
S P T Management L L C | Restricted Stock Awards      
Related-Party Transactions      
Granted (in shares) | shares 416,780 924,092 226,955
Grant date values $ 8,400,000 $ 18,800,000 $ 4,300,000
Share-based expense $ 9,500,000 8,300,000 8,700,000
S P T Management L L C | Restricted Stock Awards | Manager Equity Plan      
Related-Party Transactions      
Vesting Period 3 years    
S P T Management L L C | Employee Stock      
Related-Party Transactions      
Share-based expense $ 0 $ 0 $ 0