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Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting |  |
Sales | $ 160,537 | $ 160,874
Adjusted EBITDA from reportable segments | 52,623 | 49,776
Equity in net income from affiliated companies | 2,072 | 223
Amortization of investment in affiliate step-up | 1,601 | 1,601
Joint venture depreciation, amortization and interest | 3,254 | 3,609
Ecoservices |  |
Segment Reporting |  |
Sales | 141,602 | 137,740
Adjusted EBITDA from reportable segments | 41,494 | 36,787
Advanced Materials & Catalysts |  |
Segment Reporting |  |
Sales | 18,935 | 23,134
Adjusted EBITDA from reportable segments | 11,129 | 12,989
Advanced Materials & Catalysts | Zeolyst Joint Venture |  |
Segment Reporting |  |
Sales | 23,481 | 22,074
Adjusted EBITDA from reportable segments | $ 6,927 | 5,436
Percent ownership | 50.00% |
Equity in net income from affiliated companies | $ 2,072 | 226
Amortization of investment in affiliate step-up | 1,601 | 1,601
Joint venture depreciation, amortization and interest | $ 3,254 | $ 3,609

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