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						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
After-tax amount
Pre-tax amount	$ 508			$ 18,832			$ 7,821	$ (18,155)
Tax benefit/ (expense)	3,994			(4,335)			6,076	(1,826)
Total other comprehensive income (loss)	4,502	$ 12,534	$ (3,139)	14,497	$ 12,421	$ (46,899)	13,897	(19,981)
Amortization of net gains
After-tax amount
Pre-tax amount	1			28			4	93
Tax benefit/ (expense)	0			(9)			(1)	(25)
Total other comprehensive income (loss)	1			19			3	68
Amortization of prior service cost
After-tax amount
Pre-tax amount	(58)			(52)			(174)	(155)
Tax benefit/ (expense)	14			13			43	39
Total other comprehensive income (loss)	(44)			(39)			(131)	(116)
Settlement gain
After-tax amount
Pre-tax amount	1,507			0			1,507	0
Tax benefit/ (expense)	(374)			0			(374)	0
Total other comprehensive income (loss)	1,133			0			1,133	0
Benefit plans, net
After-tax amount
Pre-tax amount	1,450			(24)			1,337	(62)
Tax benefit/ (expense)	(360)			4			(332)	14
Total other comprehensive income (loss)	1,090			(20)			1,005	(48)
Net gain from hedging activities
After-tax amount
Pre-tax amount	613			1,260			2,184	1,215
Tax benefit/ (expense)	(153)			(315)			(546)	(304)
Total other comprehensive income (loss)	460			945			1,638	911
Foreign currency translation
After-tax amount
Pre-tax amount	(1,555)			17,596			4,300	(19,308)
Tax benefit/ (expense)	4,507			(4,024)			6,954	(1,536)
Total other comprehensive income (loss)	$ 2,952			$ 13,572			$ 11,254	$ (20,844)