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Investment in DSM Semichem LLC - Investment Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Summary of Investment Holdings          
Total Assets $ 510,122   $ 510,122   $ 538,509
Long-Term Debt 441,292   441,292   437,635
Revenues 168,717 $ 170,934 541,936 $ 536,295  
Net Income (Loss) (7,697) (2,253) (7,936) 7,368  
DSM Semichem LLC          
Summary of Investment Holdings          
Total Assets 105,590   105,590   105,773
Long-Term Debt 28,530   28,530   31,700
Members' Equity/Partners' Capital 60,710   60,710   $ 68,513
Revenues 0 0 0 0  
Net Income (Loss) $ 195 $ (1,369) $ (7,804) $ (3,249)