PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]


Property, plant and equipment consisted of the following:
	June 30, 2021		December 31, 2020
	(thousands of dollars)
Platinum catalyst metal	$	1,553	$	1,580
Catalyst	4,325		4,325
Land	5,428		5,428
Plant, pipeline and equipment	276,223		270,149
Construction in progress	9,041		6,422
Total property, plant and equipment	$	296,570	$	287,904
Less accumulated depreciation	(108,461)		(100,800)
Total property, plant and equipment, net	$	188,109	$	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 $0.1 million and $0.1 million for the three months and $0.4 million and $0.1 million for the six months ended June 30, 2021 and 2020, respectively.

Construction in progress during the first six months of 2021 included costs for rebuild and restoration of a distillation tower. Construction in progress during the first six 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 $0.2 million and $0.2 million for the three months and $0.5 million and $0.4 million for the six months ended June 30, 2021 and 2020, respectively.