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, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets      
Capital expenditure $ 127,642 $ 131,688 $ 140,482
Operating segments | Refining Services      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 42,310 46,617 42,876
Operating segments | Catalysts      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 8,984 8,390 10,269
Operating segments | Performance Materials      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 16,074 18,001 20,394
Operating segments | Performance Chemicals      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross 54,683 57,475 64,389
Operating segments | Corporate      
Revenues from External Customers and Long-Lived Assets      
Capital expenditures gross $ 5,591 $ 1,205 $ 2,554