Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customer (Details)

v3.8.0.1
Revenue from Contracts with Customer (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue    
Sales $ 366,197 $ 332,931
Environmental Catalysts & Services    
Disaggregation of Revenue    
Sales 116,375  
Performance Materials & Chemicals    
Disaggregation of Revenue    
Sales 249,822  
Operating segments    
Disaggregation of Revenue    
Sales 367,009  
Operating segments | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 92,310  
Operating segments | Fuels & emission control    
Disaggregation of Revenue    
Sales 55,997  
Operating segments | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 60,051  
Operating segments | Highway safety & construction    
Disaggregation of Revenue    
Sales 47,145  
Operating segments | Consumer products    
Disaggregation of Revenue    
Sales 76,730  
Operating segments | Natural resources    
Disaggregation of Revenue    
Sales 34,776  
Operating segments | Environmental Catalysts & Services    
Disaggregation of Revenue    
Sales 117,187  
Operating segments | Environmental Catalysts & Services | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 17,039  
Operating segments | Environmental Catalysts & Services | Fuels & emission control    
Disaggregation of Revenue    
Sales 55,997  
Operating segments | Environmental Catalysts & Services | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 28,243  
Operating segments | Environmental Catalysts & Services | Highway safety & construction    
Disaggregation of Revenue    
Sales 0  
Operating segments | Environmental Catalysts & Services | Consumer products    
Disaggregation of Revenue    
Sales 0  
Operating segments | Environmental Catalysts & Services | Natural resources    
Disaggregation of Revenue    
Sales 15,908  
Operating segments | Performance Materials & Chemicals    
Disaggregation of Revenue    
Sales 249,822  
Operating segments | Performance Materials & Chemicals | Industrial & process chemicals    
Disaggregation of Revenue    
Sales 75,271  
Operating segments | Performance Materials & Chemicals | Fuels & emission control    
Disaggregation of Revenue    
Sales 0  
Operating segments | Performance Materials & Chemicals | Packaging & engineered plastics    
Disaggregation of Revenue    
Sales 31,808  
Operating segments | Performance Materials & Chemicals | Highway safety & construction    
Disaggregation of Revenue    
Sales 47,145  
Operating segments | Performance Materials & Chemicals | Consumer products    
Disaggregation of Revenue    
Sales 76,730  
Operating segments | Performance Materials & Chemicals | Natural resources    
Disaggregation of Revenue    
Sales 18,868  
Inter-segment sales eliminations    
Disaggregation of Revenue    
Sales (812)  
Inter-segment sales eliminations | Environmental Catalysts & Services    
Disaggregation of Revenue    
Sales (812)  
Inter-segment sales eliminations | Performance Materials & Chemicals    
Disaggregation of Revenue    
Sales $ 0