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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 |

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