NET INCOME (LOSS) PER UNIT

9 Months Ended

Sep. 30, 2013

Earnings Per Share [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 nine months ended September 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. The weighted-average outstanding options to purchase NuStar GP Holdings units totaled 289,100 and 300,766for the three months ended September 30, 2013 and 2012, respectively and totaled 293,715 and 301,107 for the nine months ended September 30, 2013 and 2012, respectively.