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Significant Customers	12 Months Ended
Significant Customers	Dec. 31, 2012
Significant Customers [Abstract]
Significant Customers	Significant Customers All revenues are domestic revenues, except for refining segment sales of gasoline and diesel fuel for export into Mexico. We have two significant customers (Sinclair and Shell Oil), each accounting for 10% or more of our annual revenues. Sinclair accounted for $2,106.6 million (10%), $2,035.1 million (13%) and $1,616.0 million (19%) of our revenues for the years ended December 31, 2012, 2011 and 2010, respectively, and Shell Oil accounted for $2,323.6 million (12%) and $1,540.6 million (10%) for the years ended December 31, 2012 and 2011, respectively. Our export sales were to an affiliate of PEMEX and accounted for $429.4 million (2%), $370.0 million (2%) and $323.2 million (4%) of our revenues for the years ended December 31, 2012, 2011 and 2010, respectively.