v3.25.2
Fair Value Measurements - Summary of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Total Investments                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value, beginning of period $ 13,036,526 $ 11,127,846 $ 13,036,526 $ 11,127,846 $ 12,602,272 $ 12,976,765 $ 10,330,365 $ 9,710,582
Purchases of investments 549,363 906,931 1,267,152 1,644,649        
Proceeds from principal repayments and sales of investments (164,206) (87,920) (1,162,200) (272,398)        
Accretion of discount (amortization of premium) 10,523 9,261 26,607 18,606        
Transfers into level 3 0 0 225 0        
Transfers out of level 3 0 (51,434) (102,175) (802)        
Fair value, end of period 13,036,526 11,127,846 13,036,526 11,127,846        
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations 40,119 20,059 29,549 29,126        
Investments, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) (1,232) 195 7,103 623        
Investments, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 39,806 20,448 23,049 26,586        
First lien debt                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value, beginning of period 12,800,357 10,975,967 12,800,357 10,975,967 12,370,969 12,714,636 10,178,311 9,564,203
Purchases of investments 546,760 906,014 1,262,249 1,639,580        
Proceeds from principal repayments and sales of investments (163,314) (87,920) (1,128,141) (272,398)        
Accretion of discount (amortization of premium) 10,437 9,227 26,437 18,538        
Transfers into level 3 0 0 225 0        
Transfers out of level 3 0 (51,434) (102,175) (802)        
Fair value, end of period 12,800,357 10,975,967 12,800,357 10,975,967        
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations 37,050 21,185 30,042 28,769        
Debt Securities, First Lien, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) (1,232) 195 (212) 623        
Debt Securities, First Lien, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 36,737 21,574 27,338 26,223        
Second lien debt                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value, beginning of period 122,942 41,985 122,942 41,985 118,482 119,184 41,515 41,515
Purchases of investments 2,123 501 3,787 681        
Proceeds from principal repayments and sales of investments (662) 0 (3,010) 0        
Accretion of discount (amortization of premium) 75 23 149 48        
Transfers into level 3 0 0 0 0        
Transfers out of level 3 0 0 0 0        
Fair value, end of period 122,942 41,985 122,942 41,985        
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations 2,924 (54) 2,347 (259)        
Debt Securities, Second Lien, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 0 0 (1) 0        
Debt Securities, Second Lien, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 2,924 (54) 2,833 (259)        
Unsecured debt                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value, beginning of period 13,721 12,278 13,721 12,278 13,658 33,521 11,859 9,924
Purchases of investments 471 413 939 2,198        
Proceeds from principal repayments and sales of investments 0 0 (20,595) 0        
Accretion of discount (amortization of premium) 11 11 21 20        
Transfers into level 3 0 0 0 0        
Transfers out of level 3 0 0 0 0        
Fair value, end of period 13,721 12,278 13,721 12,278        
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations (419) (5) (435) 130        
Unsecured Debt, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 0 0 0 0        
Unsecured Debt, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) (419) (5) (165) 136        
Investments in equity                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair value, beginning of period 99,506 97,616 99,506 97,616 $ 99,163 $ 109,424 $ 98,680 $ 94,940
Purchases of investments 9 3 177 2,190        
Proceeds from principal repayments and sales of investments (230) 0 (10,454) 0        
Accretion of discount (amortization of premium) 0 0 0 0        
Transfers into level 3 0 0 0 0        
Transfers out of level 3 0 0 0 0        
Fair value, end of period 99,506 97,616 99,506 97,616        
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations 564 (1,067) (2,405) 486        
Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) 0 0 7,316 0        
Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Net realized gain (loss) $ 564 $ (1,067) $ (6,957) $ 486