Segment Data - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) bbl / pure facility store	Sep. 30, 2018 USD ($)	[1]
Segment Reporting Information [Line Items]
Number of stores	263
Proceeds from sale of retail stores | $	$ 9.9	$ 0.0
Tyler Refinery
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	75,000
El Dorado Refinery
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	80,000
Krotz Springs, Louisiana
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	74,000
Big Spring, Texas
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	73,000
Refining
Segment Reporting Information [Line Items]
Number of biodiesel facilities | facility	2
Refining
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	302,000
Retail Stores | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Number of stores	20

[1] Net income and deferred income taxes for the nine months ended September 30, 2018 reflects a correction made in our 2018 Annual Report on Form 10-K (as originally filed on March 1, 2019) to record additional deferred tax expense totaling $5.5 million related to the recognition of a valuation allowance on deferred tax assets recognized in connection with the Big Spring Logistic Assets Acquisition (see Note 5) not previously reported in our September 30, 2018 Quarterly Report on Form 10-Q filed on November 09, 2018. Such amount is not considered material to the financial statements or the trend of earnings for that period. See Note 23 to our annual audited consolidated financial statements included in Part II, Item 8 of our 2018 Annual Report on Form 10-K, as amended and filed on June 27, 2019, for further discussion.