CONSOLIDATED FINANCIAL HIGHLIGHTS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment Company, Financial Highlights [Line Items]
Common stock, outstanding (in shares)	93,812,679	76,812,863	56,280,182	58,396,516	57,005,057	49,062,820	35,769,223	14,299,500	4,130,683
Per Share Data:
Net asset value per share, beginning of year (in dollars per share)	$ 19.43	$ 19.60	$ 19.72	$ 20.46	$ 19.63	$ 20.61	$ 20.32	$ 20.03	$ 20.00
Net investment income (loss) (in dollars per share)	1.79	2.22	2.46	2.05	2.02	1.95	2.10	1.78	(0.50)
Net realized gain (loss) and net change in unrealized appreciation (depreciation) on investments, non-investment assets and liabilities and forward currency contracts (in dollars per share)	(0.45)	(0.47)	(0.55)	(0.69)	0.73	(1.00)	0.10	(0.07)	0.27
Net increase (decrease) in net assets resulting from operations (in dollars per share)	1.34	1.75	1.91	1.36	2.75	0.95	2.20	1.71	(0.23)
Dividends declared (in dollars per share)	(1.96)	(2.02)	(2.04)	(2.11)	(1.93)	(1.94)	(1.98)	(1.53)	0
Other (in dollars per share)	0.01	0.10	0.01	0.01	0.01	0.01	0.07	0.11	0.26
Net asset value per share, end of year (in dollars per share)	$ 18.82	$ 19.43	$ 19.60	$ 19.72	$ 20.46	$ 19.63	$ 20.61	$ 20.32	$ 20.03
Number of shares outstanding, end of year	93,812,679	76,812,863	56,280,182	58,396,516	57,005,057	49,062,820	35,769,223	14,299,500	4,130,683
Total return based on net asset value	7.26%	12.64%	10.18%	6.65%	14.06%	4.66%	11.17%	9.09%	0.15%
Net assets, end of year	$ 1,765,624	$ 1,492,462	$ 1,103,212	$ 1,151,501	$ 1,166,241	$ 963,136	$ 737,109	$ 289,214	$ 82,722
Ratio to average net assets:
Expenses before incentive fees	4.89%	6.47%	7.87%	5.16%	4.30%	4.60%	5.06%	5.84%	4.19%
Expenses after incentive fees	6.25%	8.10%	9.67%	6.69%	6.03%	6.34%	6.74%	6.90%	4.19%
Net investment income (loss)	9.48%	11.41%	12.58%	10.15%	9.82%	9.85%	9.54%	7.92%	(1.75%)
Interest expense and credit facility fees	3.34%	4.76%	6.31%	3.49%	2.62%	2.84%	3.41%	3.10%	0.66%
Ratios/Supplemental Data:
Asset coverage, end of year	275.20%	393.37%	246.17%	217.21%	220.61%	209.33%	213.72%	232.85%	236.17%
Portfolio turnover	27.77%	25.03%	8.99%	23.78%	25.67%	15.03%	12.47%	20.41%	8.76%
Total committed capital, end of period					$ 1,227,312	$ 1,227,312	$ 1,227,687	$ 1,227,938	$ 508,928
Ratio of total contributed capital to total committed capital, end of year					94.73%	81.28%	60.09%	23.85%	16.21%
Weighted-average shares outstanding (in shares)	81,573,132	59,200,911	56,551,480	57,991,971	50,982,223	44,300,431	23,431,444	7,907,949	1,421,700
Class S Shares
Investment Company, Financial Highlights [Line Items]
Common stock, outstanding (in shares)	0
Per Share Data:
Net asset value per share, beginning of year (in dollars per share)	$ 0
Net asset value per share, end of year (in dollars per share)	$ 0	$ 0
Number of shares outstanding, end of year	0
Class D Shares
Investment Company, Financial Highlights [Line Items]
Common stock, outstanding (in shares)	0
Per Share Data:
Net asset value per share, beginning of year (in dollars per share)	$ 0
Net asset value per share, end of year (in dollars per share)	$ 0	$ 0
Number of shares outstanding, end of year	0