Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers (Details)

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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax $ 182,820 $ 184,110 $ 343,357 $ 344,984
Clean fuels, emission control & other        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 8,614 8,426 16,003 13,166
Polyethylene, polymers & engineered plastics        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 28,862 26,045 47,797 49,179
Regeneration and treatment services        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 95,365 98,494 178,684 186,838
Industrial, mining & automotive        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 49,979 51,145 100,873 95,801
Ecoservices        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 153,958 158,065 295,560 295,805
Ecoservices | Clean fuels, emission control & other        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 8,614 8,426 16,003 13,166
Ecoservices | Polyethylene, polymers & engineered plastics        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Ecoservices | Regeneration and treatment services        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 95,365 98,494 178,684 186,838
Ecoservices | Industrial, mining & automotive        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 49,979 51,145 100,873 95,801
Advanced Materials & Catalysts        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 28,862 26,045 47,797 49,179
Advanced Materials & Catalysts | Clean fuels, emission control & other        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Advanced Materials & Catalysts | Polyethylene, polymers & engineered plastics        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 28,862 26,045 47,797 49,179
Advanced Materials & Catalysts | Regeneration and treatment services        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Advanced Materials & Catalysts | Industrial, mining & automotive        
Disaggregated Revenue        
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 0 $ 0 $ 0