Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers (Details)

v3.10.0.1
Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Sales $ 380,041 $ 427,203 $ 434,713 $ 366,197 $ 358,074 $ 391,829 $ 389,267 $ 332,931 $ 1,608,154 $ 1,472,101 $ 1,064,177
Operating segments                      
Disaggregation of Revenue [Line Items]                      
Sales                 1,611,477    
Operating segments | Industrial & chemical process                      
Disaggregation of Revenue [Line Items]                      
Sales                 357,630    
Operating segments | Fuels & emission control                      
Disaggregation of Revenue [Line Items]                      
Sales                 246,452    
Operating segments | Packaging & engineered plastics                      
Disaggregation of Revenue [Line Items]                      
Sales                 262,177    
Operating segments | Highway safety & construction                      
Disaggregation of Revenue [Line Items]                      
Sales                 320,134    
Operating segments | Consumer products                      
Disaggregation of Revenue [Line Items]                      
Sales                 272,576    
Operating segments | Natural resources                      
Disaggregation of Revenue [Line Items]                      
Sales                 152,508    
Inter-segment sales eliminations                      
Disaggregation of Revenue [Line Items]                      
Sales                 (3,323) (3,423) (1,521)
Environmental Catalysts & Services                      
Disaggregation of Revenue [Line Items]                      
Sales                 524,338    
Environmental Catalysts & Services | Operating segments                      
Disaggregation of Revenue [Line Items]                      
Sales                 527,661 473,675 426,747
Environmental Catalysts & Services | Operating segments | Industrial & chemical process                      
Disaggregation of Revenue [Line Items]                      
Sales                 77,952    
Environmental Catalysts & Services | Operating segments | Fuels & emission control                      
Disaggregation of Revenue [Line Items]                      
Sales                 246,452    
Environmental Catalysts & Services | Operating segments | Packaging & engineered plastics                      
Disaggregation of Revenue [Line Items]                      
Sales                 131,181    
Environmental Catalysts & Services | Operating segments | Highway safety & construction                      
Disaggregation of Revenue [Line Items]                      
Sales                 0    
Environmental Catalysts & Services | Operating segments | Consumer products                      
Disaggregation of Revenue [Line Items]                      
Sales                 0    
Environmental Catalysts & Services | Operating segments | Natural resources                      
Disaggregation of Revenue [Line Items]                      
Sales                 72,076    
Environmental Catalysts & Services | Inter-segment sales eliminations                      
Disaggregation of Revenue [Line Items]                      
Sales                 (3,323)    
Performance Materials & Chemicals                      
Disaggregation of Revenue [Line Items]                      
Sales                 1,083,816    
Performance Materials & Chemicals | Operating segments                      
Disaggregation of Revenue [Line Items]                      
Sales                 1,083,816 $ 1,001,849 $ 638,951
Performance Materials & Chemicals | Operating segments | Industrial & chemical process                      
Disaggregation of Revenue [Line Items]                      
Sales                 279,678    
Performance Materials & Chemicals | Operating segments | Fuels & emission control                      
Disaggregation of Revenue [Line Items]                      
Sales                 0    
Performance Materials & Chemicals | Operating segments | Packaging & engineered plastics                      
Disaggregation of Revenue [Line Items]                      
Sales                 130,996    
Performance Materials & Chemicals | Operating segments | Highway safety & construction                      
Disaggregation of Revenue [Line Items]                      
Sales                 320,134    
Performance Materials & Chemicals | Operating segments | Consumer products                      
Disaggregation of Revenue [Line Items]                      
Sales                 272,576    
Performance Materials & Chemicals | Operating segments | Natural resources                      
Disaggregation of Revenue [Line Items]                      
Sales                 80,432    
Performance Materials & Chemicals | Inter-segment sales eliminations                      
Disaggregation of Revenue [Line Items]                      
Sales                 $ 0