INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2012

INCOME TAXES [Abstract]

Components of income tax benefit

	Year Ended December 31,
	2012			2011		2010
	(Thousands of Dollars)
Current:
U.S. federal	$	465		$	129	$	(1,906	)
U.S. state	(42		)	8		(158		)
Total current	423			137		(2,064		)
Deferred:
U.S. federal	433			251		2,302
U.S. state	10			13		181
Total deferred	443			264		2,483
Total income tax benefit	$	866		$	401	$	419

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

	December 31,
	2012			2011
	(Thousands of Dollars)
Deferred income tax assets:
Share/option compensation	$	4,444		$	6,226
Pension	15,815			8,658
Capital loss	270			—
Other state	1,263			1,027
Net operating loss	1,104			—
Foreign tax credits	20			3
Other employee benefits	—			379
Deferred income tax assets	22,916			16,293
Deferred income tax liabilities:
Investment in Riverwalk Logistics, L.P. and NuStar Energy	(213		)	(212		)
Other employee benefits	(1,351		)	—
Total net deferred income tax assets	$	21,352		$	16,081