Segment Data Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) bbl	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Combined Capcity of Tyler and El Dorado Refineries | bbl	155,000
Capcity of Tyler Refinery | bbl	75,000
Capcity of El Dorado Refinery | bbl	80,000
Number of Stores	358
Revenue from Related Parties	$ 0.0	$ 0.0	$ 0.0
Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	358
Number of Stores, Dealer Locations	66
TENNESSEE | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	191
ALABAMA | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	92
GEORGIA | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	45
ARKANSAS | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	12
VIRGINIA | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	8
Kentucky and Mississippi [Member] | Retail [Member]
Segment Reporting Information [Line Items]
Number of Stores	10
Refining Marketing Services [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	$ 15.2	14.4	13.6
Crude Transportation and Storage Fees [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	121.6	95.0	57.8
RIN Sales [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	5.8	4.4	6.2
Operating Segments [Member] | Retail [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	0.0	0.0	0.0
Operating Segments [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	142.7	114.6	77.6
Operating Segments [Member] | Refining [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	$ 619.4	$ 622.1	$ 430.7