NET INCOME (LOSS) PER UNIT

6 Months Ended

Jun. 30, 2013

NET INCOME (LOSS) PER UNIT [Abstract]

NET INCOME (LOSS) PER UNIT

NET INCOME (LOSS) PER UNIT

We treat restricted units granted under our long-term incentive plan as participating securities in computing net income (loss) per unit pursuant to the two-class method. The computation of diluted net income (loss) per unit for the three and six months ended June 30, 2013 and 2012 excludes the outstanding options to purchase NuStar GP Holdings units, as the exercise price exceeded the average market price and their effect would have been anti-dilutive. Outstanding options to purchase NuStar GP Holdings units totaled 289,100 and 300,766for the three and six months ended June 30, 2013 and 2012.