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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income $ 85,663 $ 90,556
Interest and other financing expenses 31,374 31,016
Total expenses 52,863 53,902
Net investment income 34,622 37,555
Net realized gains (losses) on investments 37,825 (11,827)
Net change in unrealized (depreciation) appreciation of investments (49,077) 3,017
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Interest income 15,131 16,789
Other income 76 27
Total investment income 15,207 16,816
Interest and other financing expenses 8,180 8,790
Other expenses 306 241
Total expenses 8,486 9,031
Net investment income 6,721 7,785
Net realized gains (losses) on investments 321 (5,669)
Net change in unrealized (depreciation) appreciation of investments (8,147) 10,723
Net (decrease) increase in members' capital (1,105) 12,839
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Interest income 10,077 11,962
Other income 30 21
Total investment income 10,107 11,983
Interest and other financing expenses 5,132 6,100
Other expenses 222 224
Total expenses 5,354 6,324
Net investment income 4,753 5,659
Net realized gains (losses) on investments (229) (4,698)
Net change in unrealized (depreciation) appreciation of investments (3,763) 6,928
Net (decrease) increase in members' capital $ 761 $ 7,889