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Subsequent Events (Notes)	6 Months Ended
Subsequent Events (Notes)	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 7, 2017, we entered into an amendment to the Wyoming Refining Credit Facilities to extend the maturity date from April 30, 2018 until June 30, 2019. Our condensed consolidated balance sheet as of June 30, 2017 has been updated to reflect the revised maturity based on this subsequent event.