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INVESTMENTS - Selected Statement of Operations Information For STRS JV (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Investments [Line Items]        
Total investment income $ 14,369 $ 18,838 $ 30,231 $ 37,639
Administrative service fees 170 170 341 341
Total expenses, before fees waived 9,788 12,090 20,092 23,943
Net investment income after excise tax 4,681 6,562 10,284 13,405
Net increase (decrease) in net assets resulting from operations 10,409 2,250 9,722 6,514
STRS JV        
Schedule of Investments [Line Items]        
Interest and fee income 8,679 9,046 17,105 17,582
Total investment income 8,679 9,046 17,105 17,582
Interest expense on credit facility 3,015 3,192 6,023 6,202
Interest expense on notes to members 3,290 3,476 6,556 6,951
Administrative service fees 169 167 333 322
Other expenses 419 278 790 433
Total expenses, before fees waived 6,893 7,113 13,702 13,908
Net investment income after excise tax 1,786 1,933 3,403 3,674
Net realized gains (losses) on investments and foreign currency transactions 4 (50) (141) 15
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions 816 (1,061) 1,039 (1,435)
Net increase (decrease) in net assets resulting from operations $ 2,606 $ 822 $ 4,301 $ 2,254