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Fair Value - Level III Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 2,938,849 $ 3,136,291
Purchases, including capitalized PIK and revolver fundings 848,075 349,003
Proceeds from sales and paydowns of investments (785,213) (582,011)
Transfers into Level III 28,440 63,087
Transfers out of Level III (24,996) (11,490)
Ending balance 2,987,078 2,938,849
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (23,320) (34,144)
Total | Net realized (losses) gains on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (46,487) (33,048)
Total | Net change in unrealized appreciation (depreciation) of investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 28,410 17,017
First lien    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,637,889 1,753,967
Purchases, including capitalized PIK and revolver fundings 750,811 302,949
Proceeds from sales and paydowns of investments (516,980) (407,081)
Transfers into Level III 28,440 0
Transfers out of Level III 0 (11,490)
Ending balance 1,902,610 1,637,889
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 1,670 12,890
First lien | Net realized (losses) gains on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (13,477) (41,767)
First lien | Net change in unrealized appreciation (depreciation) of investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 15,927 41,311
Second lien    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 406,180 480,068
Purchases, including capitalized PIK and revolver fundings 5,555 4,484
Proceeds from sales and paydowns of investments (242,523) (140,837)
Transfers into Level III 0 63,087
Transfers out of Level III (24,996) 0
Ending balance 150,334 406,180
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: 1,135 1,625
Second lien | Net realized (losses) gains on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (35,085) (24,627)
Second lien | Net change in unrealized appreciation (depreciation) of investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 41,203 24,005
Subordinated    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 82,871 72,842
Purchases, including capitalized PIK and revolver fundings 21,059 10,141
Proceeds from sales and paydowns of investments (292) 0
Transfers into Level III 0 0
Transfers out of Level III 0 0
Ending balance 102,034 82,871
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (1,607) (4)
Subordinated | Net realized (losses) gains on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 3 0
Subordinated | Net change in unrealized appreciation (depreciation) of investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings (1,607) (112)
Equity and other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 811,909 829,414
Purchases, including capitalized PIK and revolver fundings 70,650 31,429
Proceeds from sales and paydowns of investments (25,418) (34,093)
Transfers into Level III 0 0
Transfers out of Level III 0 0
Ending balance 832,100 811,909
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: (24,518) (48,655)
Equity and other | Net realized (losses) gains on investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings 2,072 33,346
Equity and other | Net change in unrealized appreciation (depreciation) of investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gains or losses included in earnings $ (27,113) $ (48,187)