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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following:
March 31, 2022December 31, 2021
 (thousands of dollars)
Platinum catalyst metal$1,478 $1,478 
Catalyst4,325 4,325 
Land5,400 5,428 
Plant, pipeline and equipment286,491 282,780 
Construction in progress7,901 7,213 
Total property, plant and equipment$305,595 $301,224 
Less accumulated depreciation(119,566)(115,703)
Total property, plant and equipment, net$186,029 $185,521 
Property, plant and equipment serve as collateral for our amended and restated credit agreement. See Note 10.
In the first quarter of 2022, the Company donated approximately $0.5 million of land and other property, plant and equipment to a local municipal organization, which is included in other non-cash items on the condensed consolidated statement of cash flows.
Labor capitalized for construction was approximately $0.1 million and $0.6 million for the three months ended March 31, 2022 and 2021, respectively.
Construction in progress during the first three months of 2022 included pipeline upgrades and costs related to a scheduled plant turnaround late in the first quarter at our Specialty Petrochemicals facility. Construction in progress during the first three months of 2021 included costs for rebuild and restoration of a distillation tower.