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Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | $ 427,203 | $ 391,829 | $ 1,228,113 | $ 1,114,027
Equity in net income from affiliated companies | 5,605 | 10,257 | 31,123 | 24,879
Environmental Catalysts & Services | Zeolyst Joint Venture |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Segment Adjusted EBITDA | 10,513 | 14,398 | 45,194 | 39,690
Equity in net income from affiliated companies | 5,563 | 10,151 | 31,005 | 24,594
Investment in affiliate and inventory step-up amortization | 1,658 | 1,658 | 4,975 | 6,941
Joint venture depreciation, amortization, and interest | 3,292 | 2,563 | 9,214 | 8,073
Operating segments |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Segment Adjusted EBITDA | 128,397 | 127,785 | 382,223 | 367,319
Operating segments | Environmental Catalysts & Services |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 139,716 | 115,541 | 386,321 | 350,814
Segment Adjusted EBITDA | 65,309 | 61,900 | 188,594 | 182,578
Operating segments | Environmental Catalysts & Services | Zeolyst Joint Venture |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 32,297 | 37,622 | 120,159 | 100,991
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Silica Catalysts |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 16,347 | 15,117 | 50,167 | 52,302
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Refining Services |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 123,369 | 100,424 | 336,154 | 298,512
Operating segments | Performance Materials & Chemicals |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 288,319 | 277,072 | 844,302 | 765,781
Segment Adjusted EBITDA | 63,088 | 65,885 | 193,629 | 184,741
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Chemicals |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 174,722 | 175,467 | 548,446 | 515,454
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Materials |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | 115,380 | 104,433 | 304,660 | 257,676
Operating segments | Performance Materials & Chemicals | Intersubsegment Eliminations |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | (1,783) | (2,828) | (8,804) | (7,349)
Eliminations |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |
Net sales | $ (832) | $ (784) | $ (2,510) | $ (2,568)

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