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

Reportable Segments - Assets by Geography (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Long-lived assets	$ 1,186,770	$ 1,208,979
United States
Revenues from External Customers and Long-Lived Assets
Long-lived assets	834,229	865,799
Netherlands
Revenues from External Customers and Long-Lived Assets
Long-lived assets	49,559	52,461
United Kingdom
Revenues from External Customers and Long-Lived Assets
Long-lived assets	97,426	90,095
Other foreign countries
Revenues from External Customers and Long-Lived Assets
Long-lived assets	$ 205,556	$ 200,624