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Debt (Narrative) (Details) (USD $)	3 Months Ended
Debt (Narrative) (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Apr. 28, 2015
Debt Instrument [Line Items]
Capitalized Interest Costs, Including Allowance for Funds Used During Construction	$ 2,900,000	$ 3,000,000
Maximum borrowing capacity under revolving credit agreement	1,000,000,000
Letters of Credit Outstanding, Amount	4,700,000
Gains (Losses) on Extinguishment of Debt	0	7,677,000
6.875% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes	6.875%
Senior notes	150,000,000		150,000,000
Plains [Member] \| Lease [Member]
Debt Instrument [Line Items]
Proceeds from sale of storage assets	40,000,000
Term of lease, years	15 years
HEP [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement	650,000,000
Borrowings outstanding under revolving credit agreement	594,000,000
HEP [Member] \| 8.25% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes		8.25%
Extinguishment of Debt, Amount		156,200,000
Gains (Losses) on Extinguishment of Debt		7,700,000
Redemption Premium		6,200,000
Amortization of Financing Costs and Discounts		1,500,000
Debt Instrument, Face Amount		150,000,000
HEP [Member] \| 6.5% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes	6.50%
Senior notes	300,000,000		300,000,000
HEP [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement	50,000,000
HEP [Member] \| Holly Energy Partners Credit Agreement [Member]
Debt Instrument [Line Items]
Borrowings outstanding under revolving credit agreement	594,000,000		571,000,000
Subsequent Event [Member] \| HEP [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement				$ 850,000,000