Magellan Midstream Partners, L.P. is engaged in the transportation, storage, and distribution of refined petroleum products and crude oil in the United States. It operates in three segments: Refined Products, Crude Oil, and Marine Storage. The company operates refined products pipeline that transports gasoline, distillates, aviation fuels, and liquefied petroleum gases for independent and integrated oil companies, wholesalers, retailers, railroads, airlines, and regional farm cooperatives; and provides ancillary services, including ethanol and biodiesel loading and unloading, additive injection, custom blending, terminalling, laboratory testing, and data services. It also owns and operates crude oil pipelines and storage facilities; and marine terminals located along coastal waterways that provide distribution, storage, blending, inventory management, and additive injection services for refiners and other end-users of petroleum products. As of December 31, 2013, the company had interest 9,500-mile refined products pipeline system with 53 terminals, 27 independent terminals not connected to its pipeline system, and 1,100-mile ammonia pipeline system that transports and distributes ammonia from Texas and Oklahoma to various distribution points; approximately 1,100 miles of crude oil pipelines and storage facilities with an aggregate storage capacity of approximately 18 million barrels; and marine terminals with an aggregate storage capacity of approximately 27 million barrels. Magellan GP, LLC serves as the general partner of Magellan Midstream Partners, L.P. The company was founded in 2000 and is headquartered in Tulsa, Oklahoma.