v3.26.1
Fair Value Measurements - Summary of Changes in Fair Value of Financial Instruments Level 3 Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period $ 2,383,485 $ 1,191,944
Purchases of investments including capitalized PIK interest and dividends 294,773 185,954
Proceeds from principal repayments and sales of investments (62,431) (15,853)
Accretion of discounts 1,200 858
Net realized gain 1,152 163
Net change in unrealized gain (loss) $ (6,895) $ 4,958
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Fair value, end of period $ 2,611,284 $ 1,368,024
Net change in unrealized gain (loss) included in earnings related to financial instruments still held as of March 31, 2026 included in net change in unrealized gain (loss) on the Consolidated Statements of Operations $ (6,723) $ 5,246
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
First Lien Debt    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period $ 2,168,311 $ 1,107,757
Purchases of investments including capitalized PIK interest and dividends 275,256 185,954
Proceeds from principal repayments and sales of investments (57,274) (15,853)
Accretion of discounts 1,190 858
Net realized gain 1,152 163
Net change in unrealized gain (loss) (13,465) 4,548
Fair value, end of period 2,375,170 1,283,427
Net change in unrealized gain (loss) included in earnings related to financial instruments still held as of March 31, 2026 included in net change in unrealized gain (loss) on the Consolidated Statements of Operations (13,292) 4,836
Second Lien Debt    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 15,437  
Purchases of investments including capitalized PIK interest and dividends 7,900  
Proceeds from principal repayments and sales of investments (5,142)  
Accretion of discounts 10  
Net change in unrealized gain (loss) 6  
Fair value, end of period 18,211  
Net change in unrealized gain (loss) included in earnings related to financial instruments still held as of March 31, 2026 included in net change in unrealized gain (loss) on the Consolidated Statements of Operations 6  
Other Equity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 58,038 7,500
Purchases of investments including capitalized PIK interest and dividends 9,856  
Proceeds from principal repayments and sales of investments (15)  
Net change in unrealized gain (loss) 7,114 242
Fair value, end of period 74,993 7,742
Net change in unrealized gain (loss) included in earnings related to financial instruments still held as of March 31, 2026 included in net change in unrealized gain (loss) on the Consolidated Statements of Operations 7,114 242
Preferred Equity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 141,699 76,687
Purchases of investments including capitalized PIK interest and dividends 1,761  
Net change in unrealized gain (loss) (550) 168
Fair value, end of period 142,910 76,855
Net change in unrealized gain (loss) included in earnings related to financial instruments still held as of March 31, 2026 included in net change in unrealized gain (loss) on the Consolidated Statements of Operations $ (551) $ 168