Tax Information - Schedule of Reconciles Net Increase in Net Assets Resulting from Operations to Taxable Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Net increase in net assets resulting from operations		$ 195,874	$ 55,003	$ 192,427
Adjustments:
Net unrealized loss (gain) on investments and foreign currency forward contracts and translations		21,214	(152,304)	(84,858)
Income not currently taxable		(23,098)	(26,405)	(47,243)
Income for tax but not book		484	351	2,913
Expenses not currently deductible		5,970	4,562	1,202
Expenses for tax but not for book		(1,131)	(613)	(30)
Realized gain(loss) differences		(79,145)	(92,839)	(117,519)
Taxable income net of capital loss carryforward		77,740	92,363	116,608
Capital loss carryforward		150,640	113,240	107,598
Taxable income	[1]	$ 228,380	$ 205,603	$ 224,206

[1] Taxable income is an estimate and is not fully determined until the Company’s tax return is filed.