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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income attributable to Ecovyst Inc.	$ (1,471)	$ 7,875
Other comprehensive income (loss), net of tax:
Pension and postretirement benefits	(24)	(39)
Net (loss) gain from hedging activities	(7,920)	13,722
Foreign currency translation	2,185	(2,305)
Total other comprehensive (loss) income	(5,759)	11,378
Comprehensive (loss) income attributable to Ecovyst Inc.	$ (7,230)	$ 19,253

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