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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 83,490 $ 94,588 $ 169,153 $ 185,144
Interest and other financing expenses 31,138 33,113 62,512 64,129
Total expenses 51,483 56,776 104,346 110,678
Net investment income 34,593 38,673 69,215 76,228
Net realized gains (losses) on investments     51,214 (42,993)
Net change in unrealized (depreciation) appreciation of investments     (89,607) 33,529
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 14,936 16,596 30,067 33,385
Other income 113 58 189 85
Total investment income 15,049 16,654 30,256 33,470
Interest and other financing expenses 8,037 8,921 16,217 17,711
Other expenses 297 267 603 508
Total expenses 8,334 9,188 16,820 18,219
Net investment income 6,715 7,466 13,436 15,251
Net realized gains (losses) on investments 144 (238) 465 (5,907)
Net change in unrealized (depreciation) appreciation of investments (170) (4,225) (8,317) 6,498
Net increase in members' capital 6,689 3,003 5,584 15,842
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 9,906 12,157 19,983 24,119
Other income 61 46 91 67
Total investment income 9,967 12,203 20,074 24,186
Interest and other financing expenses 5,053 6,642 10,185 12,742
Other expenses 193 225 415 449
Total expenses 5,246 6,867 10,600 13,191
Net investment income 4,721 5,336 9,474 10,995
Net realized gains (losses) on investments 89 (176) (140) (4,874)
Net change in unrealized (depreciation) appreciation of investments (1,343) (3,384) (5,106) 3,544
Net increase in members' capital $ 3,467 $ 1,776 $ 4,228 $ 9,665