Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash Flows from Operating Activities
Net Increase (Decrease) in Net Assets Resulting from Operations	$ 119,538	$ 56,804	$ 218,527	$ 267,545
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of investments, net			(1,430,018)	(434,155)
Proceeds from investments and investment repayments, net			1,235,677	741,160
Net amortization/accretion of premium/discount on investments			(31,814)	(24,588)
Net change in unrealized (gain) loss on investments			(37,754)	6,190
Net change in unrealized (gains) losses on translation of assets and liabilities in foreign currencies			(793)	162
Net realized (gain) loss on investments			105,320	(8,037)
Net realized (gain) loss on foreign currency transactions relating to investments			14,377	22
Paid-in-kind interest			(82,120)	(87,848)
Paid-in-kind dividend			(18,803)	(25,021)
Amortization of debt issuance costs	2,108	3,147	6,528	7,349
Changes in operating assets and liabilities:
(Increase) decrease in interest receivable			(8,818)	881
(Increase) decrease in dividend income receivable			540	(999)
(Increase) decrease in paid-in-kind interest receivable			(5,384)	(6,449)
(Increase) decrease in prepaid expenses and other assets			(36,841)	(186)
Increase (decrease) in management fee payable			(182)	403
Increase (decrease) in incentive fee payable			(7,664)	1,828
Increase (decrease) in payables to affiliates			127	(872)
Increase (decrease) in payable for investments purchased			(24,163)	0
Increase (decrease) in accrued expenses and other liabilities			5,666	18,502
Net cash provided by (used in) operating activities			(97,592)	455,887
Cash Flows from Financing Activities
Borrowings on debt			156,829	552,153
Payments on debt			(167,700)	(788,154)
Debt issuance costs			(731)	(10,174)
Distributions paid			(173,348)	(152,107)
Net cash provided by (used in) financing activities			(184,950)	(398,282)
Net increase (decrease) in cash			(282,542)	57,605
Cash, beginning of period			469,017	203,293	$ 203,293
Cash, end of period	186,475	260,898	186,475	260,898	$ 469,017
Supplemental and Non-Cash Information
Interest paid during the period			131,689	123,394
Distributions declared during the period			236,029	223,426
Reinvestment of distributions during the period			63,019	53,406
Distribution payable	$ 76,545	$ 77,028	76,545	77,028
Taxes, including excise tax, paid during the period			$ 10,155	$ 7,900