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Fair Value of Investments - Schedule of Fair Value of Financial Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period $ 580,251 $ 71,758
Purchases of investments 325,491 834,513
Proceeds from principal repayments and sales of investments (8,507) (9,893)
Accretion of discount/amortization of premium 674 800
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, end of period 905,378 905,378
Net change in unrealized appreciation (depreciation) related to financial instruments still held 7,324 8,007
Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings 145 167
Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings 7,324 8,033
First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 541,085 66,971
Purchases of investments 300,575 775,285
Proceeds from principal repayments and sales of investments (7,634) (9,020)
Accretion of discount/amortization of premium 615 734
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, end of period 841,486 841,486
Net change in unrealized appreciation (depreciation) related to financial instruments still held 6,704 7,327
First Lien Debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings 141 163
First Lien Debt | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings 6,704 7,353
Second Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning of period 39,166 4,787
Purchases of investments 24,916 59,228
Proceeds from principal repayments and sales of investments (873) (873)
Accretion of discount/amortization of premium 59 66
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, end of period 63,892 63,892
Net change in unrealized appreciation (depreciation) related to financial instruments still held 620 680
Second Lien Debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings 4 4
Second Lien Debt | Net change in unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net gains (losses) included in earnings $ 620 $ 680