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Fair Value of Financial Instruments - Summary of Changes In Fair Value of Company's Level 3 Debt (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance $ 1,270,869 $ 1,095,504
Purchases, net of deferred fees 1,207,496 627,199
Non-cash conversions   21
Transfers into/(out of) of Level 3 (28,315) (7)
Proceeds from sales and paydowns (765,025) (471,926)
Accretion of OID, EOT, and PIK payments 39,574 32,953
Net realized gain/(loss) $ (23,430) $ (28,071)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized Investment Gains (Losses) Realized Investment Gains (Losses)
Net change in unrealized appreciation/(depreciation) $ 9,000 $ 15,196
Fair Value, Ending balance 1,710,169 1,270,869
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held (17,478) (17,908)
Debt    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 1,222,077 1,048,829
Purchases, net of deferred fees 1,180,013 613,853
Non-cash conversions (25,674) (500)
Transfers into/(out of) of Level 3 (28,315)  
Proceeds from sales and paydowns (759,113) (468,760)
Accretion of OID, EOT, and PIK payments 39,574 32,953
Net realized gain/(loss) (21,294) (15,292)
Net change in unrealized appreciation/(depreciation) (5,137) 10,994
Fair Value, Ending balance 1,602,131 1,222,077
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held (24,105) (8,420)
Equity    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 15,150 13,245
Purchases, net of deferred fees 6,709 4,676
Non-cash conversions 31,802 538
Proceeds from sales and paydowns (11,477) (461)
Net realized gain/(loss) 7,826 (13,546)
Net change in unrealized appreciation/(depreciation) 6,574 10,698
Fair Value, Ending balance 56,584 15,150
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held 4,631 (2,501)
Warrants    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 31,201 30,989
Purchases, net of deferred fees 20,774 8,670
Non-cash conversions (6,128) (17)
Transfers into/(out of) of Level 3   (7)
Proceeds from sales and paydowns 8,006 (2,705)
Net realized gain/(loss) (9,962) 767
Net change in unrealized appreciation/(depreciation) 7,563 (6,496)
Fair Value, Ending balance 51,454 31,201
Net change in unrealized appreciation/(depreciation) on Level 3 investments still held 1,996 (6,987)
Escrow Receivables    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning balance 2,441 2,441
Proceeds from sales and paydowns $ (2,441)  
Fair Value, Ending balance   $ 2,441