HollyFrontier Corp formerly known as Holly Corporation was incorporated in Delaware in 1947. The Company merged with Frontier Oil Corporation on July 1, 2011, with the merger; the Company changed its name from Holly Corporation to HollyFrontier Corporation. The Company is an independent petroleum refiner that produces high-value refined products such as gasoline, diesel fuel, jet fuel, specialty lubricant products, and specialty and modified asphalt. The Company's operations are currently organized into two reportable segments, Refining and HEP. The Refining segment includes the operations of El Dorado, Tulsa, Navajo, Cheyenne and Woods Cross Refineries and NK Asphalt. Its refining activities involve the purchase and refining of crude oil and wholesale and branded marketing of refined products, such as gasoline, diesel fuel and jet fuel. It also includes specialty lubricant products produced at its Tulsa Refineries that are marketed throughout North America and are distributed in Central and South America. NK Asphalt operates various asphalt terminals in Arizona and New Mexico. The HEP segment involves all of the operations of HEP. It owns and operates logistics assets consisting of petroleum product and crude oil pipelines and terminal, tankage and loading rack facilities in the Mid-Continent, Southwest and Rocky Mountain regions of the United States. The Company owns a 50% joint venture interest in Sabine Biofuels II, LLC, a 30 million gallon per year biodiesel production facility located near Port Arthur, Texas. The Company's products are shipped through HEP's pipelines from Artesia, New Mexico to El Paso, Texas and from El Paso to Albuquerque and to Mexico via products pipeline systems owned by Magellan and from El Paso to Tucson and Phoenix via a products pipeline system owned by Kinder Morgan's subsidiary, SFPP, L.P.; and petroleum products from the Navajo Refinery are transported to markets in northwest New Mexico, to Moriarty, New Mexico, near Albuquerque, via HEP's pipelines running from Artesia to San Juan County, New Mexico, and to Bloomfield, New Mexico. The Company faces competition from refining and marketing companies, including multinational oil companies, and also competes with other industries that provide alternative means to satisfy the energy and fuel requirements of industrial, commercial and individual consumers. The Company's principal products are gasolines, diesel fuels, jet fuels, fuel oil, asphalt, lubricants, gas oil, LPG and others. The Company's operations are subject to laws and regulations relating to occupational health and safety, characteristics and composition of gasoline and diesel fuels and other matters otherwise relating to the protection of the environment.