Significant Customers

12 Months Ended

Dec. 31, 2016

Significant Customers [Abstract]

Significant Customers

Significant Customers

All revenues are domestic revenues, except for sales of refined products for export into Mexico. We have two significant customers (Shell Oil and Sinclair), each of which has historically accounted for 10% or more of our annual Refining segment revenues. Shell Oil accounted for $1,048.2 million (10%), $1,252.6 million (9%) and $2,097.4 million (11%) for the years ended December 31, 2016, 2015 and 2014, respectively, and Sinclair accounted for $927.0 million (9%), $1,104.9 million (8%) and $2,018.8 million (10%) of our revenues for the years ended December 31, 2016, 2015 and 2014, respectively. Our export sales were less than 3% of our revenues for the years ended December 31, 2016, 2015 and 2014.