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Revenue Recognition
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Revenues are recognized when control of the promised goods is transferred to our customers or when a service is rendered, in an amount that reflects the consideration we are to receive in exchange for those goods or services.
The following table presents the Company's revenues, disaggregated by product group. Substantially all of the Company's revenues are derived from contracts with customers where performance obligations are satisfied at a point-in-time.
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2021202020212020
Fiberglass and steel liquid storage tanks and separation equipment$550 $1,038 691 4,456 
Heavy wall seamless carbon steel pipe and tube11,131 5,658 18,949 12,972 
Stainless steel pipe and tube46,360 39,306 86,301 83,034 
Galvanized pipe and tube10,056 6,016 17,370 12,219 
Specialty chemicals14,990 14,118 29,554 28,152 
Net sales$83,087 $66,136 $152,865 $140,833 
Arrangements with Multiple Performance Obligations
Our contracts with customers may include multiple performance obligations. For such arrangements, revenue for each performance obligation is based on its stand-alone selling price and revenue is recognized as each performance obligation is satisfied. The Company generally determines stand-alone selling prices based on the prices charged to customers using the adjusted market assessment approach or expected cost plus margin.