Delek US Holdings, Inc. is an integrated downstream energy business focused on petroleum refining and the transportation, storage and wholesale of crude oil, intermediate and refined products. The Company operates through two segments: Refining and Logistics. The Company's refining segment operates independent refineries in Tyler, Texas (the Tyler refinery) and El Dorado, Arkansas (the El Dorado refinery). The Company's logistics segment gathers, transports and stores crude oil and markets, distributes, transports and stores refined products in select regions of the southeastern United States and west Texas for both its refining segment and third parties. As of December 31, 2016, the Company's refineries located in Tyler, Texas and El Dorado, Arkansas, represented a combined 155,000 barrels per day (bpd) of crude throughput capacity. Its refining system produces a range of petroleum-based products used in transportation and industrial markets.