INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of income tax benefit (expense)

Components of income tax (expense) benefit were as follows:

	Year Ended December 31,
	2017			2016			2015
	(Thousands of Dollars)
Current:
U.S. federal	$	—		$	—		$	—
U.S. state	(1		)	(9		)	51
Total current	(1		)	(9		)	51
Deferred:
U.S. federal	(1,858		)	76			(940		)
U.S. state	21			(1		)	(12		)
Total deferred	(1,837		)	75			(952		)
Total income tax (expense) benefit	$	(1,838	)	$	66		$	(901	)

The tax effects of significant temporary differences representing deferred income tax assets and liabilities

The tax effects of significant temporary differences representing deferred income tax assets and liabilities were as follows:

	December 31,
	2017			2016
	(Thousands of Dollars)
Deferred income tax assets:
Capital loss	$	807		$	1,344
Net operating loss	3,131			5,239
Foreign tax credits	74			74
Other	137			80
Total deferred income tax assets	4,149			6,737
Less: Valuation allowance	(881		)	(1,418		)
Net deferred income tax assets	3,268			5,319
Deferred income tax liabilities:
Investment in Riverwalk Logistics, L.P. and NuStar Energy	(19		)	(233		)
Total net deferred income tax assets	$	3,249		$	5,086