Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Summary of Goodwill (Details)

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Goodwill and Intangible Assets - Summary of Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill [Line Items]        
Balance at December 31, 2019     $ 17,558  
Goodwill impairment $ (10,748) $ 0 (10,748) $ 0
Balance at September 30, 2020 6,810   6,810  
Metals Segment        
Goodwill [Line Items]        
Balance at December 31, 2019     16,203  
Goodwill impairment     (10,748)  
Balance at September 30, 2020 5,455   5,455  
Specialty Chemicals Segment        
Goodwill [Line Items]        
Balance at December 31, 2019     1,355  
Goodwill impairment     0  
Balance at September 30, 2020 $ 1,355   $ 1,355