v3.25.2
Fair Value of Financial Instruments - Schedule of Investment Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 3,851,424 $ 726,533
Purchases and other adjustments to cost 646,728 3,848,566
Sales and repayments (515,799) (621,664)
Transfers in 51,211  
Transfers out (7,980) (6,933)
Ending balance 3,997,407 3,851,424
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (29,337) (79,786)
Total | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (8,043) (23,165)
Total | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (20,134) (71,913)
Senior Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,886,706 615,704
Purchases and other adjustments to cost 572,974 2,914,625
Sales and repayments (393,520) (554,440)
Transfers in 51,211  
Transfers out 0 (4,572)
Ending balance 3,098,775 2,886,706
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (20,690) (66,259)
Senior Secured First Lien Debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (8,046) (25,740)
Senior Secured First Lien Debt | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (10,550) (58,871)
Senior Secured Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 103,368 39,153
Purchases and other adjustments to cost 3,843 119,997
Sales and repayments 2,483 (53,294)
Transfers in 0  
Transfers out (7,980) (2,361)
Ending balance 100,297 103,368
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (620) (1,542)
Senior Secured Second Lien Debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) 0 280
Senior Secured Second Lien Debt | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (1,417) (407)
Subordinated Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 196,418 35,500
Purchases and other adjustments to cost 63,124 174,933
Sales and repayments (26,729) (8,114)
Transfers in 0  
Transfers out 0 0
Ending balance 232,792 196,418
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (21) (5,888)
Subordinated Debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) 0 (13)
Subordinated Debt | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (21) (5,888)
Collateralized Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 10,893 0
Purchases and other adjustments to cost 57 21,680
Sales and repayments (2,949) (11,872)
Transfers in 0  
Transfers out 0 0
Ending balance 6,564 10,893
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (1,469) 262
Collateralized Securities | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) 172 823
Collateralized Securities | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (1,609) 262
Equity/Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 654,039 36,176
Purchases and other adjustments to cost 6,730 617,331
Sales and repayments (95,084) 6,056
Transfers in 0  
Transfers out 0 0
Ending balance 558,979 654,039
Net change in unrealized appreciation (depreciation) for the period relating to those Level 3 assets that were still held by the Company at the end of the year: (6,537) (6,359)
Equity/Other | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) (169) 1,485
Equity/Other | Net change in unrealized appreciation (depreciation) on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gain (loss) $ (6,537) $ (7,009)