Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Capital Expenditures (Details)

v3.20.4
Reportable Segments - Capital Expenditures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets      
Capital expenditure $ 97,135 $ 111,102 $ 111,795
Operating segments | Refining Services      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 31,799 42,310 46,617
Operating segments | Catalysts      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 11,177 8,984 8,390
Operating segments | Performance Chemicals      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 40,864 53,910 56,759
Operating segments | Corporate      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross $ 13,295 $ 5,898 $ 29