Ecovyst, Inc. Quarterly report pursuant to Section 13 or 15(d)

Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
After-tax amount
Pre-tax amount	$ (50,782)	$ 7,172
Tax benefit/(expense)	3,883	(1,587)
Total other comprehensive income (loss)	(46,899)	5,585
Amortization of net gains and (losses)
After-tax amount
Pre-tax amount	44	(8)
Tax benefit/(expense)	(8)	2
Total other comprehensive income (loss)	36	(6)
Amortization of prior service cost
After-tax amount
Pre-tax amount	(64)	(32)
Tax benefit/(expense)	13	8
Total other comprehensive income (loss)	(51)	(24)
Benefit plans, net
After-tax amount
Pre-tax amount	(20)	(40)
Tax benefit/(expense)	5	10
Total other comprehensive income (loss)	(15)	(30)
Net loss from hedging activities
After-tax amount
Pre-tax amount	(705)	(2,070)
Tax benefit/(expense)	176	518
Total other comprehensive income (loss)	(529)	(1,552)
Foreign currency translation
After-tax amount
Pre-tax amount	(50,057)	9,282
Tax benefit/(expense)	3,702	(2,115)
Total other comprehensive income (loss)	$ (46,355)	$ 7,167