Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investment income:
Total interest income	$ 54,533	$ 51,890
Total dividend income	8,477	7,874
Total fee and other income	3,474	3,300
Total payment-in-kind interest income	3,124	3,942
Total investment income	69,807	67,204
Operating expenses:
Interest and other financing fees	21,082	19,316
Base management fee (Note 2)	8,279	7,853
Incentive management fees (Note 2)	8,167	9,604
General and administrative expenses (Note 2)	2,676	2,736
Total operating expenses	40,204	39,509
Net investment income before taxes	29,603	27,695
Income taxes, including excise tax expense	250	195
Net investment income after taxes	29,353	27,500
Net realized gains (losses):
Net realized gains (losses) on investments	(12,608)	771
Foreign currency transactions	241	3,701
Forward currency contracts	(9,086)	(14,218)
Net realized gains (losses)	(21,453)	(9,746)
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	23,102	11,009
Credit support agreements	(6,350)	5,586
Foreign currency transactions	3,516	(8,127)
Forward currency contracts	15,833	13,502
Net unrealized appreciation (depreciation)	36,101	21,970
Net realized gains (losses) and unrealized appreciation (depreciation) on investments, credit support agreements, foreign currency transactions and forward currency contracts	14,648	12,224
Benefit from (provision for) income taxes	0	(73)
Net increase (decrease) in net assets resulting from operations	$ 44,001	$ 39,651
Net investment income per share—basic (in dollars per share)	$ 0.28	$ 0.25
Net investment income per share—diluted (in dollars per share)	0.28	0.25
Net increase (decrease) in net assets resulting from operations per share—basic and diluted (in dollars per share)	0.41	0.37
Dividends/distributions per share:
Total dividends/distributions per share, declared (in dollars per share)	0.26	0.25
Total dividends/distributions per share, paid (in dollars per share)	$ 0.26	$ 0.25
Weighted average shares outstanding—basic (in shares)	106,038,873	107,916,166
Weighted average shares outstanding—diluted (in shares)	106,038,873	107,916,166
Cash
Investment income:
Interest income from cash	$ 199	$ 198
Non-Control / Non-Affiliate investments
Investment income:
Total interest income	53,190	51,168
Total dividend income	1,322	826
Total fee and other income	3,388	3,082
Total payment-in-kind interest income	2,482	3,535
Net realized gains (losses):
Net realized gains (losses) on investments	(12,608)	771
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	8,502	7,437
Affiliate investments
Investment income:
Total interest income	957	380
Total dividend income	7,155	7,048
Total fee and other income	69	167
Total payment-in-kind interest income	251	203
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	2,795	10,841
Control investments
Investment income:
Total interest income	386	342
Total fee and other income	17	51
Total payment-in-kind interest income	391	204
Net unrealized appreciation (depreciation):
Net unrealized appreciation (depreciation) on investments	$ 11,805	$ (7,269)