Ecovyst, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Summary Financial Information by Reportable Segment (Details)

Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 352,375	$ 423,801	$ 431,675	$ 359,221	$ 380,041	$ 427,203	$ 434,713	$ 366,197	$ 1,567,072	$ 1,608,154	$ 1,472,101
Equity in net income from affiliated companies									46,034	37,611	38,772
Charges related to purchase accounting fair value adjustments									(7,534)	(6,634)
Refining Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									443,683	452,325
Catalysts
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									85,558	72,013
Performance Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									362,740	377,979
Performance Chemicals
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									675,091	705,837
Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									1,580,850	1,623,275
Segment Adjusted EBITDA									514,424	500,923	483,715
Operating segments \| Refining Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									447,081	455,562	398,342
Segment Adjusted EBITDA									175,640	176,499	154,191
Operating segments \| Catalysts
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									85,667	72,099	75,333
Segment Adjusted EBITDA									107,808	81,067	89,396
Operating segments \| Performance Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									362,965	378,279	324,225
Segment Adjusted EBITDA									76,712	72,471	69,661
Operating segments \| Performance Chemicals
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									685,137	717,335	687,645
Segment Adjusted EBITDA									154,264	170,886	170,467
Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									(13,778)	(15,121)	(13,444)
Zeolyst Joint Venture \| Catalysts
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									170,338	156,687	143,774
Segment Adjusted EBITDA									68,138	56,663	58,156
Equity in net income from affiliated companies									45,899	37,437	38,486
Charges related to purchase accounting fair value adjustments									7,534	6,634	8,600
Joint venture depreciation, amortization, and interest									$ 14,705	$ 12,592	$ 11,070