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
Jun. 30, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill $ 17,558 $ 17,558
Metals Segment    
Goodwill [Line Items]    
Goodwill 16,203 16,203
Specialty Chemicals Segment    
Goodwill [Line Items]    
Goodwill $ 1,355 $ 1,355