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Business Segment Information
3 Months Ended
Mar. 31, 2012
Business Segment Information [Abstract]  
Business Segment Information

10. Business Segment Information

Our operations consist of three operating segments: (1) Pipeline Transportation – interstate, intrastate and offshore crude oil, and to a lesser extent, CO2 pipeline transportation; (2) Refinery Services – processing high sulfur (or "sour") gas streams as part of refining operations to remove the sulfur and sale of the related by-product, and (3) Supply and Logistics – purchasing, transporting, storing, blending and marketing of crude oil and petroleum products (primarily fuel oil, asphalt, and other heavy refined products). Substantially all of our revenues are derived from, and substantially all of our assets are located in the United States. We define Segment Margin as revenues less product costs, operating expenses (excluding non-cash charges, such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. In addition, our Segment Margin definition excludes the non-cash effects of our stock appreciation rights plan and includes the non-income portion of payments received under direct financing leases. Our chief operating decision maker (our Chief Executive Officer) evaluates segment performance based on a variety of measures including Segment Margin, segment volumes where relevant, and maintenance capital investment.

 

Segment information for the periods presented below was as follows: