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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |
Total investment income | $ 91,953 | $ 68,963
Interest and other financing expenses | 30,796 | 18,637
Total expenses | 54,532 | 40,290
Net investment income before income taxes | 38,484 | 30,003
Net realized losses on investments | 665 | 19,172
Net change in unrealized appreciation (depreciation) of investments | 5,852 | (9,933)
Net increase (decrease) in net assets resulting from operations/ members capital | 44,573 | 36,192
SLP III |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |
Interest income | 15,086 | 7,930
Other income | 91 | 130
Total investment income | 15,177 | 8,060
Interest and other financing expenses | 8,406 | 2,751
Other expenses | 243 | 219
Total expenses | 8,649 | 2,970
Net investment income before income taxes | 6,528 | 5,090
Net realized losses on investments | (1,867) | (13)
Net change in unrealized appreciation (depreciation) of investments | 9,039 | (5,495)
Net increase (decrease) in net assets resulting from operations/ members capital | 13,700 | (418)
SLP IV |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |
Interest income | 11,258 | 5,936
Other income | 116 | 103
Total investment income | 11,374 | 6,039
Interest and other financing expenses | 5,832 | 1,803
Other expenses | 205 | 221
Total expenses | 6,037 | 2,024
Net investment income before income taxes | 5,337 | 4,015
Net realized losses on investments | (1,669) | (2)
Net change in unrealized appreciation (depreciation) of investments | 5,478 | (3,710)
Net increase (decrease) in net assets resulting from operations/ members capital | $ 9,146 | $ 303

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