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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 59,266 $ 73,640 $ 200,099 $ 237,222
Fiberglass and steel liquid storage tanks and separation equipment        
Disaggregation of Revenue [Line Items]        
Net sales 538 5,552 4,994 25,628
Heavy wall seamless carbon steel pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 5,436 7,963 18,408 23,252
Stainless steel pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 37,231 40,993 120,265 128,299
Galvanized pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 3,875 5,613 16,094 18,549
Specialty chemicals        
Disaggregation of Revenue [Line Items]        
Net sales $ 12,186 $ 13,519 $ 40,338 $ 41,494