HollyFrontier Corporation (HollyFrontier), formerly Holly Corporation, is a petroleum refiner, which produces light products, such as gasoline, diesel fuel, jet fuel, specialty lubricant products, and specialty and modified asphalt. HollyFrontier operates in two segments: Refining and Holly Energy Partners, L.P. (HEP). The Refining segment includes the operations of its El Dorado, Tulsa, Navajo, Cheyenne and Woods Cross Refineries and NK Asphalt. The HEP segment involves all of the operations of HEP. As of December 31, 2011, it operated five refineries having a combined crude oil processing capacity of 443,000 barrels per day that serve markets throughout the Mid-Continent, Southwest and Rocky Mountain regions of the United States. The Company merged with Frontier Oil Corporation (Frontier), on July 1, 2011. On November 9, 2011, HEP acquired from the Company certain tankage, loading rack and crude receiving assets located at its El Dorado and Cheyenne Refineries.