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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2015
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 and are reported in “Accrued compensation expense” on the consolidated balance sheets:
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Thousands of Dollars)
September 30, 2015:
 
 
 
 
 
 
 
NuStar Energy restricted units and performance awards
$
8,972

 
$
—

 
$
—

 
$
8,972

 
December 31, 2014:
 
 
 
 
 
 
 
NuStar Energy restricted units and performance awards
$
5,369

 
$
—

 
$
—

 
$
5,369