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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 95,327 $ 94,349 $ 280,471 $ 281,794
Interest and other financing expenses 37,661 31,425 101,790 93,921
Total expenses 60,791 55,315 171,469 165,575
Net investment income 35,506 40,047 111,734 119,391
Net realized gains (losses) on investments     (43,524) 7,904
Net change in unrealized (depreciation) appreciation of investments     23,368 (18,340)
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 17,860 16,848 51,245 48,083
Other income 49 295 134 452
Total investment income 17,909 17,143 51,379 48,535
Interest and other financing expenses 8,888 9,061 26,599 26,336
Other expenses 229 317 737 853
Total expenses 9,117 9,378 27,336 27,189
Net investment income 8,792 7,765 24,043 21,346
Net realized gains (losses) on investments 74 (545) (5,833) (2,400)
Net change in unrealized (depreciation) appreciation of investments (1,493) 11,856 5,005 27,810
Net increase in members' capital 7,373 19,076 23,215 46,756
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 12,906 12,476 37,025 35,669
Other income 10 100 77 258
Total investment income 12,916 12,576 37,102 35,927
Interest and other financing expenses 6,694 6,447 19,436 18,455
Other expenses 202 221 651 653
Total expenses 6,896 6,668 20,087 19,108
Net investment income 6,020 5,908 17,015 16,819
Net realized gains (losses) on investments 133 (97) (4,741) (1,751)
Net change in unrealized (depreciation) appreciation of investments (2,076) 10,361 1,468 19,942
Net increase in members' capital $ 4,077 $ 16,172 $ 13,742 $ 35,010