Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
Fair Value Measurements - Changes in Level 3 Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
First lien debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 4,882,393 $ 0
Purchases of investments 861,403 896,754
Proceeds from principal repayments and sales of investments (30,581) (55,373)
Transfers into Level 3 0 0
Transfers out of Level 3 (4,714) 0
Ending balance 5,774,333 840,223
Net change in unrealized appreciation (depreciation) related to financial instruments still held 57,176 (1,931)
First lien debt | Accretion (Amortization) of Discounts and Premiums, Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 7,981 759
First lien debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (893) 14
First lien debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 58,744 (1,931)
Second lien debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 8,794  
Purchases of investments 0  
Proceeds from principal repayments and sales of investments 0  
Transfers into Level 3 9,463  
Transfers out of Level 3 0  
Ending balance 18,048  
Net change in unrealized appreciation (depreciation) related to financial instruments still held (242)  
Second lien debt | Accretion (Amortization) of Discounts and Premiums, Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 33  
Second lien debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 0  
Second lien debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (242)  
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,606  
Purchases of investments 377  
Proceeds from principal repayments and sales of investments 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Ending balance 1,915  
Net change in unrealized appreciation (depreciation) related to financial instruments still held (79)  
Unsecured debt | Accretion (Amortization) of Discounts and Premiums, Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 9  
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 0  
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (77)  
Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2,306 0
Purchases of investments 579 67
Proceeds from principal repayments and sales of investments (52) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending balance 2,469 67
Net change in unrealized appreciation (depreciation) related to financial instruments still held (11) 0
Equity investments | Accretion (Amortization) of Discounts and Premiums, Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 0 0
Equity investments | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (353) 0
Equity investments | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (11) 0
Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 4,895,099 0
Purchases of investments 862,359 896,821
Proceeds from principal repayments and sales of investments (30,633) (55,373)
Transfers into Level 3 9,463 0
Transfers out of Level 3 (4,714) 0
Ending balance 5,796,765 840,290
Net change in unrealized appreciation (depreciation) related to financial instruments still held 56,844 (1,931)
Investments | Accretion (Amortization) of Discounts and Premiums, Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings 8,023 759
Investments | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings (1,246) 14
Investments | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (loss) included in earnings $ 58,414 $ (1,931)