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Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item |  |
Net sales | $ 366,197 | $ 332,931
Equity in net income from affiliated companies | 11,852 | 5,877
Environmental Catalysts & Services | Zeolyst Joint Venture |  |
Segment Reporting, Revenue Reconciling Item |  |
Segment Adjusted EBITDA | 16,807 | 12,087
Equity in net income from affiliated companies | 11,826 | 5,824
Investment in affiliate and inventory step-up amortization | 1,658 | 3,624
Joint venture depreciation, amortization, and interest | 3,323 | 2,639
Operating segments |  |
Segment Reporting, Revenue Reconciling Item |  |
Segment Adjusted EBITDA | 115,573 | 108,890
Operating segments | Environmental Catalysts & Services |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 117,187 | 111,281
Segment Adjusted EBITDA | 58,421 | 56,367
Operating segments | Environmental Catalysts & Services | Zeolyst Joint Venture |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 38,349 | 32,708
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Silica Catalysts |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 16,473 | 17,140
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Environmental Catalysts & Services |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 100,714 | 94,141
Operating segments | Performance Materials & Chemicals |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 249,822 | 222,605
Segment Adjusted EBITDA | 57,152 | 52,523
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Chemicals |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 189,963 | 170,949
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Materials |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | 62,742 | 53,773
Operating segments | Performance Materials & Chemicals | Intersubsegment Eliminations |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | (2,883) | (2,117)
Eliminations |  |
Segment Reporting, Revenue Reconciling Item |  |
Net sales | $ (812) | $ (955)

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