Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Goodwill - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Line Items]
Impairment expense	$ 0	$ 0	$ 67,922	$ 0
Refining
Goodwill [Line Items]
Impairment expense			38,100
Retail
Goodwill [Line Items]
Impairment expense			$ 29,800