Operating Segments (Notes) |
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| Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Disclosures | OPERATING SEGMENTS We changed our operating segment presentation in the first quarter of 2017 to reflect our expanded gathering and processing assets and operations and how our chief operating decision maker (“CODM”) manages our business. With the completion of the North Dakota Gathering and Processing Assets acquisition on January 1, 2017, our gathering and processing assets and operations expanded significantly and enhanced our ability to offer integrated gathering and processing services to our customers. Given the business’s focus on providing integrated services along with the revised reporting structure implemented by management to assess performance and make resource allocation decisions, we have determined our operating segments, which are the same for reporting purposes, are the (i) Gathering and Processing segment and (ii) Terminalling and Transportation segment. Comparable prior period information for the newly presented Gathering and Processing segment has been recast to reflect our current presentation. No changes were deemed necessary to our Terminalling and Transportation segment. In addition, as part of the CODM’s reevaluation of how it monitors and evaluates the business and allocates resources, management revised its methodology for the allocation of corporate general and administrative expenses which resulted in additional corporate costs being allocated to our Gathering and Processing segment for certain administrative activities associated with our gathering and processing business in the Rockies region. The change to our Terminalling and Transportation segment was nominal. Comparable prior period segment information has been recast to reflect our revised allocation methodology. Our Gathering and Processing segment consists of crude oil and natural gas gathering systems in the Bakken Shale/Williston Basin area of North Dakota and Montana and the Green River Basin, Uinta Basin and Vermillion Basin in the states of Utah, Colorado and Wyoming as well as gas processing complexes and fractionation facilities. Our Terminalling and Transportation segment consists of crude oil and refined products terminals and marine terminals, storage facilities for crude oil, refined products and petroleum coke handling, rail-car unloading facilities and pipelines, which transport products and crude oil. Our revenues are generated from commercial contracts we have entered into with Tesoro, under which Tesoro pays us fees, and from third-party contracts for gathering crude oil, natural gas and produced water, processing natural gas and distributing, transporting and storing crude oil, refined products, natural gas and natural gas liquids. The commercial agreements with Tesoro are described in Note 3 to our Annual Report on Form 10-K for the year ended December 31, 2016. We do not have any foreign operations. Our operating segments are strategic business units that offer different services in various geographical locations. We evaluate the performance of each segment based on its respective operating income. Certain general and administrative expenses and interest and financing costs are excluded from segment operating income as they are not directly attributable to a specific operating segment. Identifiable assets are those used by the segment, whereas other assets are principally cash, deposits and other assets that are not associated with a specific operating segment. SEGMENT INFORMATION (in millions)
TOTAL IDENTIFIABLE ASSETS BY OPERATING SEGMENT (in millions)
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