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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, 2024
Mar. 31, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income $ 90,556 $ 91,953
Interest and other financing expenses 31,016 30,796
Total expenses 53,902 54,532
Net investment income 37,555 38,484
Net realized losses on investments (11,827) 665
Net change in unrealized appreciation of investments 3,017 5,852
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Interest income 16,789 15,086
Other income 27 91
Total investment income 16,816 15,177
Interest and other financing expenses 8,790 8,406
Other expenses 241 243
Total expenses 9,031 8,649
Net investment income 7,785 6,528
Net realized losses on investments (5,669) (1,867)
Net change in unrealized appreciation of investments 10,723 9,039
Net increase in members' capital 12,839 13,700
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Interest income 11,962 11,258
Other income 21 116
Total investment income 11,983 11,374
Interest and other financing expenses 6,100 5,832
Other expenses 224 205
Total expenses 6,324 6,037
Net investment income 5,659 5,337
Net realized losses on investments (4,698) (1,669)
Net change in unrealized appreciation of investments 6,928 5,478
Net increase in members' capital $ 7,889 $ 9,146