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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income   $ 374,836 $ 294,630 $ 270,959
Interest and other financing expenses   124,784 92,421 73,098
Total expenses   218,637 178,841 165,349
Net investment income before income taxes   160,316 120,429 118,958
Net realized (losses) gains on investments   (32,854) 52,703 (3,864)
Net change in unrealized (depreciation) appreciation of investments   10,316 (84,134) 92,386
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income   64,921 41,382 31,240
Other income   502 774 573
Total investment income   65,423 42,156 31,813
Interest and other financing expenses   35,336 19,274 10,624
Other expenses   1,143 863 804
Total expenses   36,479 20,137 11,428
Net investment income before income taxes   28,944 22,019 20,385
Net realized (losses) gains on investments   (2,663) (247) 572
Net change in unrealized (depreciation) appreciation of investments   32,206 (42,366) 6,360
Net (decrease) increase in members' capital   58,487 (20,594) $ 27,317
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income $ 14,821 48,082 31,017  
Other income 234 498 561  
Total investment income 15,055 48,580 31,578  
Interest and other financing expenses 4,163 24,860 13,580  
Other expenses 773 958 757  
Total expenses 4,936 25,818 14,337  
Net investment income before income taxes 10,119 22,762 17,241  
Net realized (losses) gains on investments 183 (1,857) (164)  
Net change in unrealized (depreciation) appreciation of investments 5,033 22,982 (31,018)  
Net (decrease) increase in members' capital $ 15,335 $ 43,887 $ (13,941)