Major Customers and Concentration Of Risks

12 Months Ended

Dec. 31, 2017

Major Customers and Concentration Of Risks [Abstract]

Major Customers and Concentration Of Risks

Major Customers and Concentration of Risks

Major Customers. No customer accounted for more than 10% of our consolidated revenues during 2015, 2016 or 2017.

Concentration of Risks.We transport, store and distribute refined products for refiners, marketers, traders and end users of those products. Our revenue producing activities are concentrated in the central U.S. Concentrations of customers may affect our overall credit risk as our customers may be similarly affected by changes in economic, regulatory or other factors. We generally secure transportation and storage revenue with warehouseman’s liens. We periodically evaluate the financial condition and creditworthiness of our customers and require additional security as we deem necessary.

As of December 31, 2017, we had 1,802 employees, 940 of which were assigned to our refined products segment and concentrated in the central U.S.  Approximately 24% of the 940 employees are represented by the United Steel Workers (“USW”) and covered by a collective bargaining agreement that expires in January 2019. At December 31, 2017, 151 of our employees were assigned to our crude oil segment and were concentrated in the central U.S., and none of these employees were covered by a collective bargaining agreement.  177 employees were assigned to our marine storage segment at December 31, 2017, primarily in the Gulf and East Coast regions of the U.S.  Approximately 16% of these employees are represented by the International Union of Operating Engineers (“IUOE”) and covered by a collective bargaining agreement that expires in October 2020.