Derivatives - Effect of transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivative [Line Items]
Net change in unrealized appreciation (depreciation) on forward currency exchange contracts	$ (2,210)	$ 6,080	$ 7,565	$ 26,685	$ 5,321
Total net realized and unrealized gains (losses) on forward currency exchange contracts	17,633	(2,085)	20,894	(23,773)
Foreign Exchange Forward
Derivative [Line Items]
Net realized gains (losses) on forward currency exchange contracts	17,633	(2,085)	20,894	(23,773)
Net change in unrealized appreciation (depreciation) on forward currency exchange contracts	(2,210)	6,080	7,565	26,685
Total net realized and unrealized gains (losses) on forward currency exchange contracts	15,423	3,995	28,459	2,912
Realized and unrealized gains and losses	13,500	4,100	25,700	6,000
Impact of foreign currency on total net gains (losses)	$ 2,000	$ (100)	$ 2,800	$ (3,100)