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PLANT, PIPELINE AND EQUIPMENT
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
PLANT, PIPELINE AND EQUIPMENT PLANT, PIPELINE AND EQUIPMENT
Plant, pipeline and equipment include the following at December 31:
20202019
(thousands of dollars)
Platinum catalyst$1,580 $1,580 
Catalyst4,325 4,095 
Land5,428 5,428 
Plant, pipeline and equipment270,149 258,651 
Construction in progress6,422 5,052 
Total plant, pipeline and equipment287,904 274,806 
Less accumulated depreciation(100,800)(85,887)
Net plant, pipeline and equipment$187,104 $188,919 
Plant, pipeline and equipment serve as collateral for our amended and restated loan agreement with a domestic bank (see Note 13).
Interest capitalized for construction for 2020, 2019 and 2018 was approximately nil, nil and $0.7 million, respectively.
Labor capitalized for construction for 2020, 2019 and 2018 was approximately $0.6 million, $0.0 million and $2.3 million, respectively.
Catalyst amortization relating to the platinum catalyst which is included in cost of sales was approximately $1.2 million, $1.3 million and $0.1 million for 2020, 2019 and 2018, respectively.