Quarterly report pursuant to Section 13 or 15(d)

Revenues - Schedule of Disaggregated Revenues by Source (Details)

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Revenues - Schedule of Disaggregated Revenues by Source (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Net sales $ 74,697 $ 84,804
Fiberglass and steel liquid storage tanks and separation equipment    
Disaggregation of Revenue [Line Items]    
Net sales 3,419 9,829
Heavy wall seamless carbon steel pipe and tube    
Disaggregation of Revenue [Line Items]    
Net sales 7,314 8,587
Stainless steel pipe and tube    
Disaggregation of Revenue [Line Items]    
Net sales 43,728 45,995
Galvanized pipe and tube    
Disaggregation of Revenue [Line Items]    
Net sales 6,203 6,692
Specialty chemicals    
Disaggregation of Revenue [Line Items]    
Net sales $ 14,033 $ 13,701