PLANT, PIPELINE AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2017

PLANT, PIPELINE AND EQUIPMENT [Abstract]

Plant, Pipeline and Equipment

Plant, pipeline and equipment include the following at December 31:

	2017			2016
	(thousands of dollars)
Platinum catalyst	$	1,612		$	1,612
Land		5,428			5,376
Plant, pipeline and equipment		186,946			154,107
Construction in progress		50,996			33,391
Total plant, pipeline and equipment		244,982			194,486
Less accumulated depreciation		(63,240	)		(54,477	)
Net plant, pipeline and equipment	$	181,742		$	140,009