Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Summary Financial Information by Reportable Segment (Details)

v3.10.0.1
Reportable Segments - Summary Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item        
Net sales $ 434,713 $ 389,267 $ 800,910 $ 722,198
Equity in net income from affiliated companies 13,666 8,745 25,518 14,622
Environmental Catalysts & Services | Zeolyst Joint Venture        
Segment Reporting, Revenue Reconciling Item        
Segment Adjusted EBITDA 17,874 13,205 34,681 25,292
Equity in net income from affiliated companies 13,616 8,675 25,442 14,499
Investment in affiliate and inventory step-up amortization 1,659 1,659 3,317 5,283
Joint venture depreciation, amortization, and interest 2,599 2,871 5,922 5,510
Operating segments        
Segment Reporting, Revenue Reconciling Item        
Segment Adjusted EBITDA 138,253 130,644 253,826 239,534
Operating segments | Environmental Catalysts & Services        
Segment Reporting, Revenue Reconciling Item        
Net sales 129,418 123,992 246,605 235,273
Segment Adjusted EBITDA 64,864 64,311 123,285 120,678
Operating segments | Environmental Catalysts & Services | Zeolyst Joint Venture        
Segment Reporting, Revenue Reconciling Item        
Net sales 49,513 30,661 87,862 63,369
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Silica Catalysts        
Segment Reporting, Revenue Reconciling Item        
Net sales 17,347 20,045 33,820 37,185
Operating segments | Environmental Catalysts & Services | Reportable Subsegments | Environmental Catalysts & Services        
Segment Reporting, Revenue Reconciling Item        
Net sales 112,071 103,947 212,785 198,088
Operating segments | Performance Materials & Chemicals        
Segment Reporting, Revenue Reconciling Item        
Net sales 306,161 266,104 555,983 488,709
Segment Adjusted EBITDA 73,389 66,333 130,541 118,856
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Chemicals        
Segment Reporting, Revenue Reconciling Item        
Net sales 183,761 169,038 373,724 339,987
Operating segments | Performance Materials & Chemicals | Reportable Subsegments | Performance Materials        
Segment Reporting, Revenue Reconciling Item        
Net sales 126,538 99,470 189,280 153,243
Operating segments | Performance Materials & Chemicals | Intersubsegment Eliminations        
Segment Reporting, Revenue Reconciling Item        
Net sales (4,138) (2,404) (7,021) (4,521)
Eliminations        
Segment Reporting, Revenue Reconciling Item        
Net sales $ (866) $ (829) $ (1,678) $ (1,784)