Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net increase in net assets resulting from operations			$ 167,584	$ 139,041
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Repayments received / sales of portfolio investments			676,028	486,293
Loan origination and other fees received			23,358	16,202
Net realized (gain) loss on investments, before taxes			(11,506)	13,063
Net realized (gain) loss on foreign currency transactions	$ 406	$ (2,303)	(885)	(1,988)
Net realized (gain) loss on forward currency contracts			12,258	11,645
Net unrealized (appreciation) depreciation on investments	20,669	(17,679)	(24,819)	(14,581)
Net unrealized (appreciation) depreciation on foreign currency transactions	(430)	6,023	14,426	3,453
Net unrealized (appreciation) depreciation on forward currency contracts	(14,360)	14,110	30,037	(6,794)
Payment-in-kind interest / dividends			(24,118)	(18,993)
Amortization of deferred financing fees			2,685	1,869
Accretion of loan origination and other fees			(11,701)	(10,941)
Amortization / accretion of purchased loan premium / discount			(4,090)	(986)
Payments for derivative contracts			(50,642)	(26,282)
Proceeds from derivative contracts			38,384	14,637
Changes in operating assets and liabilities:
Interest and fees receivable			(8,327)	(2,295)
Prepaid expenses and other assets			(2,013)	(2,800)
Accounts payable and accrued liabilities			1,945	904
Interest payable			9,777	(10,974)
Net cash provided by (used in) operating activities			(1,112,162)	(280,909)
Cash flows from financing activities:
Borrowings under credit facilities			1,057,781	224,510
Repayments under credit facilities			(841,552)	(353,035)
Proceeds from debt securitization			0	410,000
Repayments of debt securitization			0	(402,500)
Proceeds from notes payable			400,000	0
Financing fees paid			(10,788)	(8,112)
Issuance of common stock			799,322	597,096
Cash dividends / distributions paid			(180,495)	(133,607)
Purchases of shares in repurchase plan			(76,898)	(36,045)
Net cash provided by (used in) financing activities			1,147,370	298,307
Net increase (decrease) in cash and foreign currencies			35,208	17,398
Cash and foreign currencies, beginning of period			131,066	83,563	$ 83,563
Cash and foreign currencies, end of period	166,274	100,961	166,274	100,961	131,066
Supplemental disclosure of cash flow information:
Cash paid for interest			61,105	70,377
Excise taxes paid during the period			2,447	1,269
Summary of non-cash financing transactions:
Dividends / distributions paid through DRIP share issuances			19,282	11,834
Share repurchases payable	$ 46,178	$ 14,511	46,178	14,511	$ 5,847
Investments Excluding Money Market Funds
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of portfolio investments			(1,950,041)	(861,181)
Short-term investments
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of portfolio investments			$ (502)	$ (10,201)