v3.26.3
Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 60,414 $ 80,529 $ 190,683 $ 249,682
Interest and other financing expenses 22,867 31,720 72,845 94,232
Total expenses 38,108 51,002 120,646 155,348
Net investment income 23,693 34,071 78,969 103,286
Net realized losses on investments     (77,526) 51,223
Net change in unrealized appreciation (depreciation) of investments     (22,994) (111,171)
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 18,796 16,172 56,176 46,239
Other income 93 64 526 253
Total investment income 18,889 16,236 56,702 46,492
Interest and other financing expenses 11,895 8,227 35,250 24,444
Other expenses 349 329 1,070 932
Total expenses 12,244 8,556 36,320 25,376
Net investment income 6,645 7,680 20,382 21,116
Net realized losses on investments (913) (1,294) (2,541) (829)
Net change in unrealized appreciation (depreciation) of investments 9,441 (1,122) (32,110) (9,439)
Net increase (decrease) in members' capital 15,173 5,264 (14,269) 10,848
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 13,081 11,308 38,769 31,291
Other income 59 65 360 156
Total investment income 13,140 11,373 39,129 31,447
Interest and other financing expenses 7,986 5,986 23,997 16,171
Other expenses 262 258 872 673
Total expenses 8,248 6,244 24,869 16,844
Net investment income 4,892 5,129 14,260 14,603
Net realized losses on investments (588) (541) (1,613) (681)
Net change in unrealized appreciation (depreciation) of investments 3,290 (1,569) (21,823) (6,675)
Net increase (decrease) in members' capital $ 7,594 $ 3,019 $ (9,176) $ 7,247