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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Liabilities measured at fair value on a recurring basis
The following liabilities are measured at fair value on a recurring basis:
 
December 31, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Thousands of Dollars)
Accrued compensation expense:
 
 
 
 
 
 
 
NuStar Energy restricted units
$
6,224

 
$

 
$

 
$
6,224

Total
$
6,224

 
$

 
$

 
$
6,224


 
 
December 31, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Thousands of Dollars)
Accrued compensation expense:
 
 
 
 
 
 
 
NuStar Energy restricted units
$
10,376

 
$

 
$

 
$
10,376

Total
$
10,376

 
$

 
$

 
$
10,376