Overview

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Overview

OVERVIEW

SemGroup Corporation is a Delaware corporation headquartered in Tulsa, Oklahoma that provides diversified services for end-users and consumers of crude oil, natural gas, natural gas liquids and refined products.

The accompanying consolidated financial statements include the activities of SemGroup Corporation and its subsidiaries. The terms “we,” “our,” “us,” “the Company” and similar language used in these notes to consolidated financial statements refer to SemGroup Corporation and its subsidiaries.

At December 31, 2018, our operating and reportable segments include the following:

• our U.S. Liquids segment operates crude oil pipelines, truck transportation, storage, terminals and marketing businesses in the U.S. Additionally, we store, blend and transport refinery products and refinery feedstocks via pipeline, barge, rail, truck and ship and operate a residual fuel oil storage terminal in the U.S. Gulf Coast;

• our U.S. Gas segment provides natural gas gathering, processing and marketing services. U.S. Gas aggregates gas supplies from the wellhead and provides various services to producers that condition the wellhead gas production for downstream markets; and

• our Canada segment provides natural gas gathering and processing services in Alberta, Canada and owns working interests in, and operates, a network of natural gas gathering and transportation pipelines and natural gas processing plants.

Additionally, we own an 11.78% interest in the general partner of NGL Energy Partners LP ("NGL Energy") (NYSE: NGL). See Note 4 for discussion of the disposal of our Mexican asphalt business and our U.K. operations during the year ended December 31, 2018.