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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill for the years ended December 31, 2021 and 2020 were as follows:
(in thousands)Specialty Chemicals SegmentMetals
Segment		Total
Balance December 31, 2019$1,355 $16,203 $17,558 
Impairment charges— (16,203)(16,203)
Balance December 31, 20201,355 — 1,355 
Acquisitions11,282 — 11,282 
Balance December 31, 2021$12,637 $— $12,637 
Schedule of Amortization Expense for Finite-lived Intangible Assets
Estimated amortization expense for the next five fiscal years based on existing intangible assets is as follows:
(in thousands)
2022$2,884 
20231,433 
20241,336 
20251,238 
20261,141 
Thereafter6,350 
Total$14,382