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PLANT, PIPELINE AND EQUIPMENT
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following:
March 31, 2021December 31, 2020
 (thousands of dollars)
Platinum catalyst metal$1,580 $1,580 
Catalyst4,298 4,325 
Land5,428 5,428 
Plant, pipeline and equipment271,960 270,149 
Construction in progress9,335 6,422 
Total property, plant and equipment$292,601 $287,904 
Less accumulated depreciation(104,678)(100,800)
Total property, plant and equipment, net$187,923 $187,104 
Property, plant and equipment serve as collateral for our amended and restated credit agreement. See Note 11.
Labor capitalized for construction was approximately $0.3 million and $0.6 million for the three months ended March 31, 2021 and 2020, respectively.
Construction in progress during the first three months of 2021 included costs for rebuild and restoration of a distillation tower. Construction in progress during the first three months of 2020 included Advanced Reformer unit improvements and pipeline maintenance at SHR and equipment modifications at TC.
Amortization relating to the catalyst, which is included in cost of sales, was approximately $0.3 million and $0.2 million for the three months ended March 31, 2021 and 2020, respectively.