Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
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)