Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers (Details)

v3.10.0.1
Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue        
Sales $ 434,713 $ 389,267 $ 800,910 $ 722,198
Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales 128,552   244,927  
Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales 306,161   555,983  
Operating segments        
Disaggregation of Revenue        
Sales 435,579   802,588  
Operating segments | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 93,146   185,456  
Operating segments | Fuels & emission control        
Disaggregation of Revenue        
Sales 60,212   116,209  
Operating segments | Packaging & engineered plastics        
Disaggregation of Revenue        
Sales 67,885   127,936  
Operating segments | Highway safety & construction        
Disaggregation of Revenue        
Sales 110,746   157,891  
Operating segments | Consumer products        
Disaggregation of Revenue        
Sales 65,388   142,118  
Operating segments | Natural resources        
Disaggregation of Revenue        
Sales 38,202   72,978  
Operating segments | Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales 129,418   246,605  
Operating segments | Environmental Catalysts & Services | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 17,335   34,374  
Operating segments | Environmental Catalysts & Services | Fuels & emission control        
Disaggregation of Revenue        
Sales 60,212   116,209  
Operating segments | Environmental Catalysts & Services | Packaging & engineered plastics        
Disaggregation of Revenue        
Sales 33,919   62,162  
Operating segments | Environmental Catalysts & Services | Highway safety & construction        
Disaggregation of Revenue        
Sales 0   0  
Operating segments | Environmental Catalysts & Services | Consumer products        
Disaggregation of Revenue        
Sales 0   0  
Operating segments | Environmental Catalysts & Services | Natural resources        
Disaggregation of Revenue        
Sales 17,952   33,860  
Operating segments | Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales 306,161   555,983  
Operating segments | Performance Materials & Chemicals | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 75,811   151,082  
Operating segments | Performance Materials & Chemicals | Fuels & emission control        
Disaggregation of Revenue        
Sales 0   0  
Operating segments | Performance Materials & Chemicals | Packaging & engineered plastics        
Disaggregation of Revenue        
Sales 33,966   65,774  
Operating segments | Performance Materials & Chemicals | Highway safety & construction        
Disaggregation of Revenue        
Sales 110,746   157,891  
Operating segments | Performance Materials & Chemicals | Consumer products        
Disaggregation of Revenue        
Sales 65,388   142,118  
Operating segments | Performance Materials & Chemicals | Natural resources        
Disaggregation of Revenue        
Sales 20,250   39,118  
Inter-segment sales eliminations        
Disaggregation of Revenue        
Sales (866)   (1,678)  
Inter-segment sales eliminations | Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales (866)   (1,678)  
Inter-segment sales eliminations | Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales $ 0   $ 0