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Investment in DSM Semichem LLC - Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Summary of Investment Holdings
Total Assets	$ 533,410		$ 538,509
Long-Term Debt	451,449		437,635
Revenues	192,543	$ 180,830
Net Income (Loss)	84	4,069
DSM Semichem LLC
Summary of Investment Holdings
Total Assets	103,352		105,773
Long-Term Debt	31,734		31,700
Members' Equity/Partners' Capital	66,677		$ 68,513
Revenues	0	0
Net Income (Loss)	$ (2,090)	$ (6,240)

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