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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 66,136 $ 78,778 $ 140,833 $ 163,582
Fiberglass and steel liquid storage tanks and separation equipment        
Disaggregation of Revenue [Line Items]        
Net sales 1,038 10,247 4,456 20,076
Heavy wall seamless carbon steel pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 5,658 6,703 12,972 15,289
Stainless steel pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 39,306 41,310 83,034 87,305
Galvanized pipe and tube        
Disaggregation of Revenue [Line Items]        
Net sales 6,016 6,243 12,219 12,936
Specialty chemicals        
Disaggregation of Revenue [Line Items]        
Net sales $ 14,118 $ 14,275 $ 28,152 $ 27,976