v3.25.1
Fair Value - Level III Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Transfers into Level III $ 14,363  
Total | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,446,945 $ 1,958,982
Purchases, including capitalized PIK and revolver fundings 144,188 30,439
Proceeds from sales and paydowns of investments (101,671) (83,019)
Transfers into Level III   6,404
Ending balance 1,496,892 1,920,858
Net change in unrealized appreciation (depreciation) for the period relating to those Level III assets that were still held by the Company at the end of the period 1,455 6,011
Total | Net realized gains (losses) on investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (8,417) (3,249)
Total | Net change in unrealized appreciation (depreciation) of investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 1,484 11,301
First lien    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Transfers into Level III 0  
First lien | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,248,992 1,555,234
Purchases, including capitalized PIK and revolver fundings 124,862 26,418
Proceeds from sales and paydowns of investments (95,243) (60,519)
Transfers into Level III   0
Ending balance 1,273,379 1,524,092
Net change in unrealized appreciation (depreciation) for the period relating to those Level III assets that were still held by the Company at the end of the period 3,261 2,924
First lien | Net realized gains (losses) on investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (8,490) (3,249)
First lien | Net change in unrealized appreciation (depreciation) of investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 3,258 6,208
Second lien    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Transfers into Level III 14,363  
Second lien | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 72,312 269,766
Purchases, including capitalized PIK and revolver fundings 0 0
Proceeds from sales and paydowns of investments 0 (22,500)
Transfers into Level III   6,404
Ending balance 85,543 257,741
Net change in unrealized appreciation (depreciation) for the period relating to those Level III assets that were still held by the Company at the end of the period (1,133) 2,065
Second lien | Net realized gains (losses) on investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 0 0
Second lien | Net change in unrealized appreciation (depreciation) of investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (1,132) 4,071
Subordinated    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Transfers into Level III 0  
Subordinated | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 37,360 35,080
Purchases, including capitalized PIK and revolver fundings 7,329 650
Proceeds from sales and paydowns of investments 0 0
Transfers into Level III   0
Ending balance 44,773 35,669
Net change in unrealized appreciation (depreciation) for the period relating to those Level III assets that were still held by the Company at the end of the period 84 (61)
Subordinated | Net realized gains (losses) on investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 0 0
Subordinated | Net change in unrealized appreciation (depreciation) of investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 84 (61)
Equity and other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Transfers into Level III 0  
Equity and other | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 88,281 98,902
Purchases, including capitalized PIK and revolver fundings 11,997 3,371
Proceeds from sales and paydowns of investments (6,428) 0
Transfers into Level III   0
Ending balance 93,197 103,356
Net change in unrealized appreciation (depreciation) for the period relating to those Level III assets that were still held by the Company at the end of the period (757) 1,083
Equity and other | Net realized gains (losses) on investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 73 0
Equity and other | Net change in unrealized appreciation (depreciation) of investments | Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings $ (726) $ 1,083