v3.26.1
Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 61,475 $ 83,490 $ 130,269 $ 169,153
Interest and other financing expenses 22,454 31,138 49,978 62,512
Total expenses 38,276 51,483 82,538 104,346
Net investment income 24,641 34,593 55,276 69,215
Net realized (losses) gains on investments     (76,994) 51,214
Net change in unrealized depreciation of investments     (3,735) (89,607)
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 19,164 14,936 37,380 30,067
Other income 158 113 433 189
Total investment income 19,322 15,049 37,813 30,256
Interest and other financing expenses 12,104 8,037 23,355 16,217
Other expenses 322 297 721 603
Total expenses 12,426 8,334 24,076 16,820
Net investment income 6,896 6,715 13,737 13,436
Net realized (losses) gains on investments (974) 144 (1,628) 465
Net change in unrealized depreciation of investments (8,593) (170) (41,551) (8,317)
Net (decrease) increase in members' capital (2,671) 6,689 (29,442) 5,584
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 13,109 9,906 25,688 19,983
Other income 137 61 301 91
Total investment income 13,246 9,967 25,989 20,074
Interest and other financing expenses 8,223 5,053 16,011 10,185
Other expenses 319 193 610 415
Total expenses 8,542 5,246 16,621 10,600
Net investment income 4,704 4,721 9,368 9,474
Net realized (losses) gains on investments (604) 89 (1,025) (140)
Net change in unrealized depreciation of investments (4,907) (1,343) (25,113) (5,106)
Net (decrease) increase in members' capital $ (807) $ 3,467 $ (16,770) $ 4,228