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Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 170,197 | $ 167,428 | $ 146,952 | $ 126,624 | $ 124,050 | $ 130,675 | $ 115,641 | $ 125,554 | $ 611,201 | $ 495,920 | $ 532,747
Equity in net income from affiliated companies |  |  |  |  |  |  |  |  | 27,737 | 21,065 | 45,808
Amortization of investment in affiliate step-up |  |  |  |  |  |  |  |  | (6,480) | (6,634) |
Ecoservices |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 500,513 | 401,913 | 447,080
Catalyst Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 110,688 | 94,007 | 85,667
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | 227,611 | 192,615 | 240,185
Operating segments | Ecoservices |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 500,513 | 401,913 | 447,080
Adjusted EBITDA |  |  |  |  |  |  |  |  | 177,672 | 157,198 | 175,640
Operating segments | Catalyst Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 110,688 | 94,007 | 85,667
Adjusted EBITDA |  |  |  |  |  |  |  |  | 88,028 | 74,504 | 107,808
Operating segments | Unallocated corporate expenses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | (38,089) | (39,087) | (43,263)
Zeolyst Joint Venture | Catalyst Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 131,332 | 128,623 | 170,338
Adjusted EBITDA |  |  |  |  |  |  |  |  | 49,872 | 42,515 | 68,138
Equity in net income from affiliated companies |  |  |  |  |  |  |  |  | 27,827 | 21,157 | 45,899
Amortization of investment in affiliate step-up |  |  |  |  |  |  |  |  | 6,480 | 6,634 | 7,534
Joint venture depreciation, amortization and interest |  |  |  |  |  |  |  |  | $ 15,565 | $ 14,724 | $ 14,705

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