Holly Energy Partners (Narrative) (Details) $ / shares in Units, $ in Thousands					3 Months Ended				12 Months Ended			32 Months Ended
	Aug. 01, 2018 USD ($)	Feb. 06, 2018 USD ($)	Jan. 25, 2018 $ / shares shares	Feb. 01, 2017 USD ($)	Dec. 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) mi	Dec. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) Customers mi shares bbl	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) shares	Oct. 31, 2017 USD ($)	Feb. 22, 2016
Schedule of Equity Method Investments [Line Items]
Number of significant customers									0
Concentration risk, precentage of total revenues									79.00%
Payments to Acquire Businesses, Gross	$ 54,200			$ 862,100			$ 250,000		$ 54,179	$ 0	$ 0
Acquisition, Cash Consideration Paid				906,700			363,800
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value							112,000
Remeasurement gain on pipeline interest acquisition									0	36,254	0
Working Capital Adjustment							$ 1,800			1,800
Assets Acquired and Liabilities Assumed, Cash and Cash Equivalents				21,600									$ 4,600
Assets Acquired and Liabilities Assumed, Current Assets	14,400			333,400									5,200
Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	21,300			438,000									275,000
Assets Acquired and Liabilities Assumed, Intangible Assets	9,700			124,300									70,200
Assets Acquired and Liabilities Assumed, Goodwill	10,800			194,800									13,800
Assets Acquired and Liabilities Assumed, Current Liabilities	$ 2,000			$ 87,400									$ 5,000
Investment in Equity Company					$ 83,800				83,800			$ 83,800
Repayment of term loan - HFC						$ 39,500		$ 39,500	0	0	350,000
Loss on early extinguishment of debt								$ 8,700	0	$ (12,225)	$ (8,718)
Deferred Credits and Other Liabilities, Noncurrent						38,900
Partners' Capital Account, Units, Sold in Private Placement | shares			3,700,000		37,250,000
Limited Partners' Cumulative Cash Distributions					$ 2,500				2,500			$ 2,500
Shares Issued, Price Per Share | $ / shares			$ 29.73
Proceeds from Issuance of Private Placement		$ 110,000
Common Unit Issuance Program									$ 200,000
Limited Partners' Capital Account, Units Issued | shares					171,246				171,246			171,246
Stock Issued During Period, Shares, Period Increase (Decrease) | shares												2,413,153
Proceeds from Issuance of Common Stock									$ 5,200			$ 82,300
UNEV Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					75.00%				75.00%			75.00%
Frontier Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					50.00%				50.00%			50.00%
HEP
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					50.00%				50.00%			50.00%
Percentage of ownership in variable interest entity									57.00%
Number of significant customers | Customers									2
Payments to Acquire Other Productive Assets					$ 278,000
Length of pipeline | mi									87
Pipeline Throughput Capacity | bbl									80,000
Extinguishment of Debt, Amount						30,800
Loss on early extinguishment of debt						$ 8,700
Long-term Purchase Commitment, Amount									$ 314,200
Osage Pipeline [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage														50.00%
Length of pipeline | mi						135