Investments - ISLP Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investment Income
Total investment income	$ 62,815	$ 49,545	$ 161,190	$ 145,864
Expenses
Interest and debt financing expenses	14,381	12,265	36,051	37,115
Total expenses before fee waivers	28,712	27,784	78,669	89,370
Net investment income (loss)	34,103	21,761	82,521	65,850
Net realized and unrealized gain (losses)
Net realized gain (loss) on foreign currency transactions	2,254	(72)	4,932	(2,093)
Net gain (loss) on investments	(23,052)	1,581	(20,560)	31,678
Net increase in net assets resulting from operations	11,051	23,342	61,961	97,528
International Senior Loan Program, LLC
Investment Income
Interest Income	11,275	6,055	28,912	14,167
Total investment income	11,275	6,055	28,912	14,167
Expenses
Interest and debt financing expenses	3,485	1,515	7,249	3,423
Interest expense on members subordinated notes	5,745	3,242	14,072	7,686
General and administrative expenses	660	457	1,822	1,215
Total expenses before fee waivers	9,890	5,214	23,143	12,324
Net investment income (loss)	1,385	841	5,769	1,843
Net realized and unrealized gain (losses)
Net realized gain (loss) on investments	(525)	(904)	(2,420)	(924)
Net realized gain (loss) on foreign currency transactions	2,966	843	5,774	3,509
Net realized gain (loss) on forward contracts	4,894	330	7,030	1,524
Net change in unrealized appreciation (depreciation) on foreign currency	21,883	4,279	41,380	9,148
Net change in unrealized appreciation (depreciation) on forward contracts	(587)	1,169	2,168	1,599
Change in unrealized gains (losses)	(31,496)	(5,228)	(64,466)	(9,005)
Net gain (loss) on investments	(2,865)	489	(10,534)	5,851
Net increase in net assets resulting from operations	$ (1,480)	$ 1,330	$ (4,765)	$ 7,694