FINANCIAL HIGHLIGHTS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Per share data:
Net asset value per share, beginning balance (in dollars per share)	$ 22.27	$ 21.66
Net investment income (in dollars per share)	0.65	0.68
Net realized gain (loss) on investments / foreign currency transactions / forward currency contracts (in dollars per share)	(0.36)	(0.35)
Net unrealized appreciation (depreciation) on investments / foreign currency transactions / forward currency contracts (in dollars per share)	0.67	0.59
Total increase from investment operations (in dollars per share)	0.96	0.92
Dividends paid to stockholders from net investment income (in dollars per share)	(0.64)	(0.57)
Dividends paid to stockholders from short-term realized gains (in dollars per share)	0	(0.03)
Total dividends declared (in dollars per share)	(0.64)	(0.60)
Net asset value per share, ending balance (in dollars per share)	$ 22.59	$ 21.98
Shares outstanding at end of period (in shares)	29,672,058	28,142,612	29,270,679
Net assets at end of period	$ 670,241	$ 618,439
Average net assets	$ 658,852	$ 609,288
Ratio of total expenses to average net assets (annualized)	11.07%	10.09%
Ratio of net investment income to average net assets (annualized)	11.54%	12.39%
Portfolio turnover ratio (annualized)	3.22%	1.83%
Total return	4.35%	4.29%