v3.25.4
Fair Value Measurements - Reconciliation of Investment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 692,929,000 $ 192,754,000
Purchases of investments and other adjustments to cost 1,149,512,000 573,346,000
Paid-in-kind interest income 12,337,000 1,919,000
Net accretion of discounts (amortization of premiums) 3,173,000 1,286,000
Principal repayments and sales of investments (272,478,000) (77,497,000)
Net change in unrealized appreciation on investments 16,065,000 135,000
Net realized gain on investments 1,155,000 986,000
Reclassifications 0 0
Ending Balance 1,602,693,000 692,929,000
Change in unrealized appreciation attributable to investments still held 16,301,000 159,000
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 692,929,000  
Ending Balance 1,602,693,000 692,929,000
First Lien Senior Secured Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 661,476,000 188,789,000
Purchases of investments and other adjustments to cost 994,124,000 534,738,000
Paid-in-kind interest income 3,000,000 503,000
Net accretion of discounts (amortization of premiums) 3,000,000 1,286,000
Principal repayments and sales of investments (271,451,000) (62,497,000)
Net change in unrealized appreciation on investments 4,950,000 (2,029,000)
Net realized gain on investments 1,155,000 686,000
Ending Balance 1,396,254,000 661,476,000
Change in unrealized appreciation attributable to investments still held 5,186,000 (2,006,000)
Second Lien Senior Secured Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases of investments and other adjustments to cost 18,749,000  
Net accretion of discounts (amortization of premiums) 8,000  
Net change in unrealized appreciation on investments (8,000)  
Ending Balance 18,749,000  
Change in unrealized appreciation attributable to investments still held (8,000)  
Equity Interests    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 10,984,000 90,000
Purchases of investments and other adjustments to cost 18,937,000 9,439,000
Principal repayments and sales of investments (277,000)  
Net change in unrealized appreciation on investments 8,250,000 1,455,000
Ending Balance 37,894,000 10,984,000
Change in unrealized appreciation attributable to investments still held 8,250,000 1,456,000
Preferred Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 14,694,000 3,875,000
Purchases of investments and other adjustments to cost 13,466,000 23,772,000
Paid-in-kind interest income 923,000 1,414,000
Net accretion of discounts (amortization of premiums) 2,000  
Principal repayments and sales of investments (750,000) (15,000,000)
Net change in unrealized appreciation on investments 1,095,000 333,000
Net realized gain on investments   300,000
Reclassifications (5,068,000)  
Ending Balance 24,362,000 14,694,000
Change in unrealized appreciation attributable to investments still held 1,095,000 333,000
Subordinated Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 5,147,000  
Purchases of investments and other adjustments to cost 83,996,000 5,397,000
Paid-in-kind interest income 8,414,000 2,000
Net accretion of discounts (amortization of premiums) 163,000  
Net change in unrealized appreciation on investments 1,173,000 (252,000)
Net realized gain on investments 0  
Reclassifications 5,068,000  
Ending Balance 103,961,000 5,147,000
Change in unrealized appreciation attributable to investments still held 1,173,000 (252,000)
Warrants    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 628,000  
Net change in unrealized appreciation on investments 605,000 628,000
Ending Balance 1,233,000 628,000
Change in unrealized appreciation attributable to investments still held 605,000 $ 628,000
Subordinated Notes in Investment Vehicles    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases of investments and other adjustments to cost [1] 20,240,000  
Ending Balance [1] $ 20,240,000  
[1] Represents debt investment in SLP II.