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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 |

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