Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Level 3 Portfolio (Details)

v3.24.3
Fair Value Measurements - Changes in Level 3 Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 9,705,173 $ 6,130,906 $ 8,028,268 $ 4,895,099
Purchases of investments 2,146,604 787,370 4,721,789 2,085,491
Proceeds from principal repayments and sales of investments (436,007) (96,893) (1,403,602) (266,628)
Transfers into Level 3 0 2,272 0 11,735
Transfers out of Level 3 (19,600) (136,235) (26,336) (140,949)
Ending balance 11,482,834 6,716,578 11,482,834 6,716,578
Net change in unrealized appreciation (depreciation) related to financial instruments still held 75,932 18,855 124,347 98,796
Investments | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 15,977 8,634 54,260 24,284
Investments | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 918 50 (7,509) 608
Investments | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 69,769 20,474 115,964 106,938
First lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 9,543,295 6,104,163 7,956,235 4,882,393
Purchases of investments 2,118,632 778,508 4,604,971 2,071,394
Proceeds from principal repayments and sales of investments (423,012) (96,696) (1,390,222) (266,254)
Transfers into Level 3 0 2,272 0 2,272
Transfers out of Level 3 (19,600) (136,235) (26,336) (140,949)
Ending balance 11,308,563 6,681,145 11,308,563 6,681,145
Net change in unrealized appreciation (depreciation) related to financial instruments still held 78,992 18,897 126,239 98,971
First lien debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 15,723 8,596 53,794 24,198
First lien debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 696 21 (7,791) 981
First lien debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 72,829 20,516 117,912 107,110
Second lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 19,071 20,039 19,441 8,794
Purchases of investments 24,750 0 24,750 1,879
Proceeds from principal repayments and sales of investments (6,676) 0 (6,676) 0
Transfers into Level 3 0 0 0 9,463
Transfers out of Level 3 0 0 0 0
Ending balance 34,361 20,382 34,361 20,382
Net change in unrealized appreciation (depreciation) related to financial instruments still held (3,041) 306 (3,489) 151
Second lien debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 35 37 113 95
Second lien debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 222 0 222 0
Second lien debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (3,041) 306 (3,489) 151
Other secured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 64,304   0  
Purchases of investments 0   63,700  
Proceeds from principal repayments and sales of investments (6,319)   (6,319)  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Ending balance 57,803   57,803  
Net change in unrealized appreciation (depreciation) related to financial instruments still held (395)   81  
Other secured debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 213   341  
Other secured debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0   0  
Other secured debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings (395)   81  
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 30,568 1,975 15,936 1,606
Purchases of investments 1,140 329 15,731 772
Proceeds from principal repayments and sales of investments 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 31,832 2,342 31,832 2,342
Net change in unrealized appreciation (depreciation) related to financial instruments still held 118 37 153 (30)
Unsecured debt | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 6 1 12 (9)
Unsecured debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 0 0 0
Unsecured debt | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 118 37 153 (27)
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 47,935 4,729 36,656 2,306
Purchases of investments 2,082 8,533 12,637 11,446
Proceeds from principal repayments and sales of investments 0 (197) (385) (374)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 50,275 12,709 50,275 12,709
Net change in unrealized appreciation (depreciation) related to financial instruments still held 258 (385) 1,363 (296)
Equity investments | Accretion of discount/amortization of premium        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 0 0 0
Equity investments | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings 0 29 60 (373)
Equity investments | Net change in unrealized appreciation (depreciation)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Gain (loss) included in earnings $ 258 $ (385) $ 1,307 $ (296)