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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Total investment income $ 294,630 $ 270,959 $ 273,711
Interest and other financing expenses 92,421 73,098 78,047
Total expenses 178,841 165,349 170,080
Net investment income before income taxes 120,429 118,958 117,366
Net realized (losses) gains on investments 52,703 (3,864) (2,802)
Net change in unrealized (depreciation) appreciation of investments (84,134) 92,386 (53,718)
SLP III      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Interest income 41,382 31,240 27,476
Other income 774 573 576
Total investment income 42,156 31,813 28,052
Interest and other financing expenses 19,274 10,624 11,872
Other expenses 863 804 747
Total expenses 20,137 11,428 12,619
Net investment income before income taxes 22,019 20,385 15,433
Net realized (losses) gains on investments (247) 572 262
Net change in unrealized (depreciation) appreciation of investments (42,366) 6,360 (418)
Net (decrease) increase in members' capital (20,594) 27,317 $ 15,277
SLP IV      
Investment Company, Nonconsolidated Subsidiary [Line Items]      
Interest income 31,017 14,821  
Other income 561 234  
Total investment income 31,578 15,055  
Interest and other financing expenses 13,580 4,163  
Other expenses 757 773  
Total expenses 14,337 4,936  
Net investment income before income taxes 17,241 10,119  
Net realized (losses) gains on investments (164) 183  
Net change in unrealized (depreciation) appreciation of investments (31,018) 5,033  
Net (decrease) increase in members' capital $ (13,941) $ 15,335