Concentration of Credit Risk

12 Months Ended

Dec. 31, 2017

We may incur credit risk to the extent our customers do not fulfill their obligations to us pursuant to contractual terms. Risks of nonpayment and nonperformance by our customers are a major consideration in our business, and our credit procedures and policies may not be adequate to sufficiently eliminate customer credit risk. Managing credit risk involves a number of considerations, such as the financial profile of the customer, the value of collateral held, if any, specific terms and duration of the contractual agreement, and the customer’s sensitivity to economic developments. We have established various procedures to manage credit exposure, including initial credit approval, credit limits, and rights of offset. We also utilize letters of credit and guarantees to limit exposure.

Our largest customers consist of large multinational integrated crude oil companies and independent domestic refiners of crude oil. In addition, we transact business with independent crude oil producers, major chemical concerns, crude oil trading companies and a variety of commercial energy users. Within this group of customers, we derive approximately 50 percent of our revenues from three to five large crude oil refining customers. While we have ongoing established relationships with certain domestic refiners of crude oil, alternative markets are readily available since we supply less than one percent of U.S. domestic refiner demand. As a fungible commodity delivered to major Gulf Coast supply points, our crude oil sales can be readily delivered to alternative end markets.

We believe that a loss of any of those customers where we currently derive more than 10 percent of our revenues would not have a material adverse effect on our operations as shown in the table below:



Individual customer sales						Individual customer receivables in excess
in excess of 10% of revenues						of 10% of total receivables
for the year ended December 31,						at December 31,
2017		2016		2015		2017		2016		2015

22.8	%	18.2	%	24.4	%	19.1	%	20.9	%	20.3	%
17.1	%	16.5	%	13.8	%	15.0	%	14.0	%	16.5	%
10.8	%	15.9	%			11.1	%	10.1	%	12.7	%
10.7	%	10.6	%			10.4	%