Description of Business and Presentation of Financial Statements - Impact of Adoption, Cumulative Effect on Financials (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable: Product and transportation	$ 828,629	$ 651,332	$ 659,530
Inventories: Crude oil and refined products	1,635,861	1,414,662	1,409,538
Accounts payable	1,176,417	1,228,131	1,220,795
Deferred income taxes (HEP: $558 and $525, respectively)	755,561	644,822	647,785
Retained earnings	$ 4,112,629	$ 3,339,168	3,346,615
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable: Product and transportation			(8,198)
Inventories: Crude oil and refined products			5,124
Accounts payable			7,336
Deferred income taxes (HEP: $558 and $525, respectively)			(2,963)
Retained earnings			(7,447)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable: Product and transportation			659,530
Inventories: Crude oil and refined products			1,409,538
Accounts payable			1,220,795
Deferred income taxes (HEP: $558 and $525, respectively)			647,785
Retained earnings			$ 3,346,615

Accounts receivable Product and transportation.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Carrying amount as of the balance sheet date of finished goods inventories for petroleum products, crude oil, petrochemical products, and other oil and gas inventories.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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