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Goodwill (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Goodwill  
Beginning balance $ 391,565
Goodwill recognized 37,646
Foreign exchange impact 494
Ending balance 429,705
Ecoservices  
Goodwill  
Beginning balance 311,892
Goodwill recognized 37,646
Foreign exchange impact 0
Ending balance 349,538
Catalyst Technologies  
Goodwill  
Beginning balance 79,673
Goodwill recognized 0
Foreign exchange impact 494
Ending balance $ 80,167