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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue        
Sales $ 427,203 $ 391,829 $ 1,228,113 $ 1,114,027
Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales 138,884   383,811  
Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales 288,319   844,302  
Operating segments        
Disaggregation of Revenue        
Sales 428,035   1,230,623  
Operating segments | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 86,097   271,553  
Operating segments | Fuels & emission control        
Disaggregation of Revenue        
Sales 66,095   182,304  
Operating segments | Packaging & engineered plastics        
Disaggregation of Revenue        
Sales 64,831   192,767  
Operating segments | Highway safety & construction        
Disaggregation of Revenue        
Sales 105,204   263,095  
Operating segments | Consumer products        
Disaggregation of Revenue        
Sales 67,138   209,256  
Operating segments | Natural resources        
Disaggregation of Revenue        
Sales 38,670   111,648  
Operating segments | Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales 139,716   386,321  
Operating segments | Environmental Catalysts & Services | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 21,027   55,401  
Operating segments | Environmental Catalysts & Services | Fuels & emission control        
Disaggregation of Revenue        
Sales 66,095   182,304  
Operating segments | Environmental Catalysts & Services | Packaging & engineered plastics        
Disaggregation of Revenue        
Sales 32,983   95,145  
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 19,611   53,471  
Operating segments | Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales 288,319   844,302  
Operating segments | Performance Materials & Chemicals | Industrial & process chemicals        
Disaggregation of Revenue        
Sales 65,070   216,152  
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 31,848   97,622  
Operating segments | Performance Materials & Chemicals | Highway safety & construction        
Disaggregation of Revenue        
Sales 105,204   263,095  
Operating segments | Performance Materials & Chemicals | Consumer products        
Disaggregation of Revenue        
Sales 67,138   209,256  
Operating segments | Performance Materials & Chemicals | Natural resources        
Disaggregation of Revenue        
Sales 19,059   58,177  
Inter-segment sales eliminations        
Disaggregation of Revenue        
Sales (832)   (2,510)  
Inter-segment sales eliminations | Environmental Catalysts & Services        
Disaggregation of Revenue        
Sales (832)   (2,510)  
Inter-segment sales eliminations | Performance Materials & Chemicals        
Disaggregation of Revenue        
Sales $ 0   $ 0