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Investment in DSM Semichem LLC - Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Summary of Investment Holdings
Total Assets	$ 515,632		$ 515,632		$ 538,509
Long-Term Debt	427,821		427,821		437,635
Revenues	180,676	$ 184,531	373,219	$ 365,361
Net Income (Loss)	(323)	5,552	(239)	9,621
DSM Semichem LLC
Summary of Investment Holdings
Total Assets	105,437		105,437		105,773
Long-Term Debt	28,530		28,530		31,700
Members' Equity/Partners' Capital	60,515		60,515		$ 68,513
Revenues	0	0	0	0
Net Income (Loss)	$ (5,909)	$ (672)	$ (7,999)	$ (1,880)

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