Derivatives Derivatives - Schedule of Derivative Positions (2/1/1 Crack Spread sales) (Details) - Dec. 31, 2019 - 2-1-1- Crack Spread Swap - Not Designated as Hedging Instrument [Member] - Fuel Product [Member]	$ / bbl	bbl	MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		394,000	0
Average Swap ($/Bbl) | $ / bbl	17.58
Second Quarter 2020
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		30,000
Barrels per Day Purchased		330
Average Swap ($/Bbl) | $ / bbl	19.50
First Quarter 2020
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		364,000
Barrels per Day Purchased		4,000
Average Swap ($/Bbl) | $ / bbl	17.43