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Borrowings - 2028 Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Nov. 15, 2023
Borrowings      
Principal amount $ 3,780,439 $ 2,656,207  
Debt 2,775,533 2,151,713  
Private Placement Bonds | Series A Notes      
Borrowings      
Principal amount     $ 100,000
Interest rate     9.42%
Debt $ 100,000 $ 100,000  
Weighted average interest rate 9.40% 9.40%  
Private Placement Bonds | Series B Notes      
Borrowings      
Principal amount     $ 100,000
Interest rate     9.42%
Debt $ 100,000 $ 100,000  
Weighted average interest rate 9.40% 9.40%  
Private Placement Bonds | 2028 Notes      
Borrowings      
Minimum net worth     $ 660,865
Asset coverage ratio     1.50
Private Placement Bonds | 2028 Notes | Below Investment Grade Event      
Borrowings      
Additional interest rate     1.00%
Private Placement Bonds | 2028 Notes | Secured Debt Ratio Event      
Borrowings      
Additional interest rate     1.50%
Private Placement Bonds | 2028 Notes | Below Investment Grade Event and a Secured Debt Ratio Event      
Borrowings      
Additional interest rate     2.00%