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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [line Items]
Net sales	$ 111,839	$ 136,584
Graphite Electrodes
Disaggregation of Revenue [line Items]
Net sales	101,262	123,987
By-products and other
Disaggregation of Revenue [line Items]
Net sales	$ 10,577	$ 12,597

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