Commitments and Contingencies Commitment and Contingencies - Narrative (Details)			1 Months Ended	12 Months Ended				29 Months Ended
	Mar. 22, 2018 USD ($)	Mar. 17, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2018 USD ($) claim	Jun. 17, 2013 USD ($)	Aug. 03, 2011 USD ($)
Long-term Purchase Commitment [Line Items]
Loss contingency, damages sought		$ 4,500,000
Multiplier for earnout payment before EBITDA										4
Minimum EBITDA benchmark for earnout										$ 3,500,000.0
Maximum earnout payment amount										$ 4,500,000.0
RINs benefit (expense)				$ 1,100,000
Site contingency reimbursement								$ 12,200,000
Bankruptcy claims number of claims to be settled | claim				2				2
Bankruptcy claims amount of claims to be settled				$ 22,400,000				$ 22,400,000
Settlement liabilities, current				500,000				500,000
Maximum bankruptcy claims remaining				$ 22,400,000				$ 22,400,000
Predecessor working ownership percentage				3.40%				3.40%
Allowed claims, settlement ratio					0.0544
Wyoming Refinery One
Long-term Purchase Commitment [Line Items]
Environmental costs recognized, period for recognition of one third costs				5 years
Environmental costs recognized, period for recognition				30 years
Accrual for environmental loss contingencies				$ 17,300,000				$ 17,300,000
Wyoming Refinery Two | Waste Water Treatment System
Long-term Purchase Commitment [Line Items]
Accrual for environmental loss contingencies				11,600,000				11,600,000
Wyoming Refinery
Long-term Purchase Commitment [Line Items]
Loss contingency, range of possible loss, portion not accrued				100,000				100,000
Maximum | Tesoro Corporation
Long-term Purchase Commitment [Line Items]
Contingent consideration, liability									$ 40,000,000
Barbatas Earnout
Long-term Purchase Commitment [Line Items]
Loss contingency, damages paid			$ 350,000
Site contingency, loss exposure not accrued, best estimate			$ 300,000
Tesoro Corporation
Long-term Purchase Commitment [Line Items]
Contingent consideration, liability									$ 20,000,000
Loss contingency, damages paid	$ 10,500,000					$ 16,800,000
Loss contingency, damages sought						$ 8,300,000	$ 4,300,000
Tesoro Corporation | Indemnification Agreement
Long-term Purchase Commitment [Line Items]
Guarantor obligations, deductible				1,000,000				1,000,000
Guarantor obligations, maximum exposure, undiscounted				$ 15,000,000				$ 15,000,000