Investments - Schedule of Investment Interest Income and Fee Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Schedule Of Investments [Line Items]
Total PIK interest income	$ 134,226	$ 131,157	$ 408,671	$ 376,300
Total fee income	5,889	6,936	22,094	18,763
Income Statement Location [Axis]: us-gaap:FeeIncome
Schedule Of Investments [Line Items]
Total PIK interest income	12,294	14,246	43,237	39,264
Income Statement Location [Axis]: us-gaap:FeeIncome \| Recurring fee income
Schedule Of Investments [Line Items]
Total fee income	3,395	2,945	9,582	8,379
Income Statement Location [Axis]: us-gaap:FeeIncome \| Expired commitments
Schedule Of Investments [Line Items]
Total fee income	338	454	1,648	1,486
Income Statement Location [Axis]: us-gaap:FeeIncome \| Early repayments
Schedule Of Investments [Line Items]
Total fee income	2,156	3,537	10,864	8,898
Income Statement Location [Axis]: us-gaap:GrossInvestmentIncomeOperating
Schedule Of Investments [Line Items]
Total PIK interest income	106,863	97,533	315,080	280,771
Income Statement Location [Axis]: us-gaap:InterestAndDividendIncomeOperating
Schedule Of Investments [Line Items]
Total PIK interest income	2,406	2,803	8,235	8,082
Income Statement Location [Axis]: us-gaap:InterestAndDividendIncomeOperatingPaidInCash
Schedule Of Investments [Line Items]
Total PIK interest income	2,100	2,100	6,300	6,600
Income Statement Location [Axis]: us-gaap:InterestIncomeOperatingPaidInKind
Schedule Of Investments [Line Items]
Total PIK interest income	$ 10,563	$ 14,475	$ 35,819	$ 41,583