Quarterly report pursuant to Section 13 or 15(d)

Disaggregated Revenue (Details)

v3.21.1
Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregated Revenue    
Sales $ 126,624 $ 125,554
Operating segments    
Disaggregated Revenue    
Sales 126,624 125,554
Operating segments | Industrial & process chemicals    
Disaggregated Revenue    
Sales 16,947 19,406
Operating segments | Fuels & emission control    
Disaggregated Revenue    
Sales 55,192 55,710
Operating segments | Packaging & engineered plastics    
Disaggregated Revenue    
Sales 37,024 35,551
Operating segments | Natural resources    
Disaggregated Revenue    
Sales 17,461 14,887
Operating segments | Refining Services    
Disaggregated Revenue    
Sales 100,222 100,690
Operating segments | Refining Services | Industrial & process chemicals    
Disaggregated Revenue    
Sales 16,947 19,359
Operating segments | Refining Services | Fuels & emission control    
Disaggregated Revenue    
Sales 55,192 55,710
Operating segments | Refining Services | Packaging & engineered plastics    
Disaggregated Revenue    
Sales 10,622 10,734
Operating segments | Refining Services | Natural resources    
Disaggregated Revenue    
Sales 17,461 14,887
Operating segments | Catalysts    
Disaggregated Revenue    
Sales 26,402 24,864
Operating segments | Catalysts | Industrial & process chemicals    
Disaggregated Revenue    
Sales 0 47
Operating segments | Catalysts | Fuels & emission control    
Disaggregated Revenue    
Sales 0 0
Operating segments | Catalysts | Packaging & engineered plastics    
Disaggregated Revenue    
Sales 26,402 24,817
Operating segments | Catalysts | Natural resources    
Disaggregated Revenue    
Sales $ 0 $ 0