Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Capital Expenditures (Details)

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Reportable Segments - Capital Expenditures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets      
Capital expenditures $ 65,335 $ 58,870 $ 60,045
Operating segments | Ecoservices      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures 53,705 47,770 43,561
Operating segments | Advanced Materials & Catalysts      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures 8,441 8,194 15,997
Operating segments | Corporate      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures $ 3,189 $ 2,906 $ 487