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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 94,588 $ 95,492 $ 185,144 $ 187,445
Interest and other financing expenses 33,113 31,700 64,129 62,496
Total expenses 56,776 55,728 110,678 110,260
Net investment income 38,673 40,860 76,228 79,344
Net realized (losses) gains on investments     (42,993) 3,231
Net change in unrealized (depreciation) appreciation of investments     33,529 (1,461)
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 16,596 16,149 33,385 31,235
Other income 58 66 85 157
Total investment income 16,654 16,215 33,470 31,392
Interest and other financing expenses 8,921 8,869 17,711 17,275
Other expenses 267 293 508 536
Total expenses 9,188 9,162 18,219 17,811
Net investment income 7,466 7,053 15,251 13,581
Net realized (losses) gains on investments (238) 12 (5,907) (1,855)
Net change in unrealized (depreciation) appreciation of investments (4,225) 6,915 6,498 15,954
Net increase in members' capital 3,003 13,980 15,842 27,680
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 12,157 11,991 24,119 23,249
Other income 46 42 67 158
Total investment income 12,203 12,033 24,186 23,407
Interest and other financing expenses 6,642 6,176 12,742 12,008
Other expenses 225 227 449 432
Total expenses 6,867 6,403 13,191 12,440
Net investment income 5,336 5,630 10,995 10,967
Net realized (losses) gains on investments (176) 15 (4,874) (1,654)
Net change in unrealized (depreciation) appreciation of investments (3,384) 4,160 3,544 9,638
Net increase in members' capital $ 1,776 $ 9,805 $ 9,665 $ 18,951