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Goodwill (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Carrying Amount of Goodwill
Changes in the carrying amount of goodwill by segment for the year ended December 31, 2020 and 2019 are as follows: 
(in thousands)Specialty Chemicals SegmentMetals SegmentTotal
Balance December 31, 2018$1,355 $8,445 $9,800 
American Stainless Acquisition— 7,758 $7,758 
Balance December 31, 2019$1,355 $16,203 $17,558 
Impairment charges— (16,203)$(16,203)
Balance December 31, 2020$1,355 $— $1,355