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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 78,449 $ 68,474 $ 220,522 $ 202,743
Interest and other financing expenses 24,648 17,693 63,957 54,949
Total expenses 46,768 41,589 129,693 125,092
Net investment income before income taxes 32,796 30,637 94,416 88,844
Net realized (losses) gains on investments     35,468 12,692
Net change in unrealized (depreciation) appreciation of investments     (67,634) 52,544
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 11,113 8,080 27,767 23,278
Other income 110 172 463 487
Total investment income 11,223 8,252 28,230 23,765
Interest and other financing expenses 5,468 2,679 11,875 7,954
Other expenses 205 207 641 585
Total expenses 5,673 2,886 12,516 8,539
Net investment income before income taxes 5,550 5,366 15,714 15,226
Net realized (losses) gains on investments (128) (83) (145) 488
Net change in unrealized (depreciation) appreciation of investments (1,566) 887 (37,004) 6,439
Net increase (decrease) in members' capital 3,856 6,170 (21,435) 22,153
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 8,333 5,806 20,749 9,034
Other income 102 143 257 157
Total investment income 8,435 5,949 21,006 9,191
Interest and other financing expenses 3,940 1,649 8,288 2,523
Other expenses 188 206 596 475
Total expenses 4,128 1,855 8,884 2,998
Net investment income before income taxes 4,307 4,094 12,122 6,193
Net realized (losses) gains on investments (85) (85) (77) 139
Net change in unrealized (depreciation) appreciation of investments (1,013) 2,214 (25,142) 4,265
Net increase (decrease) in members' capital $ 3,209 $ 6,223 $ (13,097) $ 10,597