FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2014

Liabilities measured at fair value on a recurring basis

The following liabilities are measured at fair value on a recurring basis:



	June 30, 2014
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Accrued compensation expense:
NuStar Energy restricted units and performance awards	$	11,899	$	—	$	—	$	11,899
NuStar Energy unit options	—		1,198		—		1,198
Total	$	11,899	$	1,198	$	—	$	13,097

	December 31, 2013
	Level 1		Level 2		Level 3		Total
	(Thousands of Dollars)
Accrued compensation expense:
NuStar Energy restricted units and performance awards	$	6,224	$	—	$	—	$	6,224
NuStar Energy unit options	—		29		—		29
Total	$	6,224	$	29	$	—	$	6,253

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

The fair value of our accrued compensation expense for NuStar Energy unit options is determined using the Black-Scholes option-pricing model on the reporting date based on the following weighted average assumptions:



	June 30, 2014		December 31, 2013
Expected life in years	5.9		5.8
Expected volatility	26.7	%	26.4	%
Expected distribution yield	7.1	%	8.6	%
Risk-free interest rate	0.1	%	0.1	%

- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

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