NuStar Energy L.P. provides terminalling services for crude oil and refined petroleum products to the producers of crude oil, integrated oil companies, chemical companies, oil traders and refiners. The Company's operations are managed by NuStar GP, LLC, the general partner of Riverwalk Logistics, L.P., its general partner. NuStar GP, LLC is a wholly owned subsidiary of NuStar GP Holdings, LLC (NuStar GP Holdings). The Company conducts its operations through its wholly owned subsidiaries, primarily NuStar Logistics, L.P. (NuStar Logistics) and Kaneb Pipe Line Operating Partnership, L.P. (KPOP). The Company has five business segments: refined product terminals, refined product pipelines, crude oil pipelines, crude oil storage tanks and marketing. In March 2008, NuStar Energy, L.P. announced that it has completed its acquisition of CITGO Asphalt Refining Company's asphalt operations and assets.