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Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregated Revenue |  |  |  |
Sales | $ 146,952 | $ 115,641 | $ 273,576 | $ 241,195
Ecoservices |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 120,737 |  | 220,959 |
Catalyst Technologies |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 26,215 |  | 52,617 |
Operating segments |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 146,956 | 115,641 | 273,580 | 241,195
Operating segments | Industrial & process chemicals |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 18,341 | 16,715 | 35,288 | 36,121
Operating segments | Fuels & emission control |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 68,794 | 50,682 | 123,987 | 106,393
Operating segments | Packaging & engineered plastics |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 41,194 | 32,679 | 78,217 | 68,229
Operating segments | Natural resources |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 18,627 | 15,565 | 36,088 | 30,452
Operating segments | Ecoservices |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 120,741 | 90,433 | 220,963 | 191,123
Operating segments | Ecoservices | Industrial & process chemicals |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 18,341 | 16,713 | 35,288 | 36,072
Operating segments | Ecoservices | Fuels & emission control |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 68,794 | 50,682 | 123,987 | 106,393
Operating segments | Ecoservices | Packaging & engineered plastics |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 14,979 | 7,473 | 25,600 | 18,206
Operating segments | Ecoservices | Natural resources |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 18,627 | 15,565 | 36,088 | 30,452
Operating segments | Catalyst Technologies |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 26,215 | 25,208 | 52,617 | 50,072
Operating segments | Catalyst Technologies | Industrial & process chemicals |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 0 | 2 | 0 | 49
Operating segments | Catalyst Technologies | Fuels & emission control |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 0 | 0 | 0 | 0
Operating segments | Catalyst Technologies | Packaging & engineered plastics |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 26,215 | 25,206 | 52,617 | 50,023
Operating segments | Catalyst Technologies | Natural resources |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | 0 | $ 0 | 0 | $ 0
Eliminations |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | (4) |  | (4) |
Eliminations | Ecoservices |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | (4) |  | (4) |
Eliminations | Catalyst Technologies |  |  |  |
Disaggregated Revenue |  |  |  |
Sales | $ 0 |  | $ 0 |

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