Major Customers and Concentration Of Risks	12 Months Ended
Dec. 31, 2013
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 10% or more of our consolidated total revenue in 2013. However, one customer accounted for 21% and 14% of our consolidated total revenue in 2011 and 2012, respectively. The majority of revenue from this customer resulted from sale of refined products that were generated in connection with our butane blending and fractionation activities and from sales associated with the management of our linefill for the Houston-to-El Paso pipeline section, all of which are or were activities conducted by our refined products segment. Concentration of Risks. We transport, store and distribute refined products for refiners, marketers, traders and end users of those products. We derive the major concentration of our revenue from activities conducted in the central U.S. 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, 2013, we had 1,459 employees. At December 31, 2013, the labor force of 842 employees assigned to our refined products segment was concentrated in the central U.S. Approximately 26% of these employees were represented by the United Steel Workers (“USW”) and covered by a collective bargaining agreement that expires January 31, 2015. At December 31, 2013, the labor force of 51 employees assigned to our crude oil segment was concentrated in the central U.S. and none of these employees were covered by a collective bargaining agreement. The labor force of 171 employees assigned to our marine storage segment at December 31, 2013 was primarily located in the Gulf and East Coast regions of the U.S. Approximately 16% of these employees were represented by the International Union of Operating Engineers (“IUOE”) and covered by a collective bargaining agreement that expires October 31, 2016.

Major Customers and Concentration Of Risks

12 Months Ended

Dec. 31, 2013

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 10% or more of our consolidated total revenue in 2013. However, one customer accounted for 21% and 14% of our consolidated total revenue in 2011 and 2012, respectively. The majority of revenue from this customer resulted from sale of refined products that were generated in connection with our butane blending and fractionation activities and from sales associated with the management of our linefill for the Houston-to-El Paso pipeline section, all of which are or were activities conducted by our refined products segment.

Concentration of Risks. We transport, store and distribute refined products for refiners, marketers, traders and end users of those products. We derive the major concentration of our revenue from activities conducted in the central U.S. 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, 2013, we had 1,459 employees. At December 31, 2013, the labor force of 842 employees assigned to our refined products segment was concentrated in the central U.S. Approximately 26% of these employees were represented by the United Steel Workers (“USW”) and covered by a collective bargaining agreement that expires January 31, 2015. At December 31, 2013, the labor force of 51 employees assigned to our crude oil segment was concentrated in the central U.S. and none of these employees were covered by a collective bargaining agreement. The labor force of 171 employees assigned to our marine storage segment at December 31, 2013 was primarily located in the Gulf and East Coast regions of the U.S. Approximately 16% of these employees were represented by the International Union of Operating Engineers (“IUOE”) and covered by a collective bargaining agreement that expires October 31, 2016.