Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended							9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 6.875% Senior Notes Due 2018 [Member]	Dec. 31, 2013 6.875% Senior Notes Due 2018 [Member]	Sep. 30, 2014 Holly Frontier Credit Agreement [Member]	Jul. 01, 2014 Holly Frontier Credit Agreement [Member]	Jun. 30, 2014 Holly Frontier Credit Agreement [Member]	Sep. 30, 2014 Plains [Member] Lease [Member]	Sep. 30, 2014 HEP [Member] 8.25% Senior Notes Due 2018 [Member]	Dec. 31, 2013 HEP [Member] 8.25% Senior Notes Due 2018 [Member]	Sep. 30, 2014 HEP [Member] 6.5% Senior Notes Due 2020 [Member]	Dec. 31, 2013 HEP [Member] 6.5% Senior Notes Due 2020 [Member]	Sep. 30, 2014 HEP [Member] Letter of Credit [Member]	Sep. 30, 2014 HEP [Member] Holly Energy Partners Credit Agreement [Member]	Dec. 31, 2013 HEP [Member] Holly Energy Partners Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement								$ 1,000,000,000	$ 1,000,000,000						$ 50,000,000	$ 650,000,000
Letters of Credit Outstanding, Amount							4,700,000
Borrowings outstanding under revolving credit agreement																555,000,000	363,000,000
Stated interest rate, senior notes		9.875%		9.875%	6.875%						8.25%		6.50%
Extinguishment of Debt, Amount				301,000,000							156,200,000
Gains (Losses) on Extinguishment of Debt	0	0	7,677,000	22,109,000
Redemption Premium				14,200,000							6,200,000
Amortization of Financing Costs and Discounts				7,900,000							1,500,000
Senior notes					150,000,000	150,000,000					0	150,000,000	300,000,000	300,000,000
Debt Instrument, Face Amount		286,800,000		286,800,000							150,000,000
Proceeds from sale of storage assets										40,000,000
Term of lease, years										15 years
Interest Costs Capitalized	$ 2,900,000	$ 2,800,000	$ 9,000,000	$ 9,200,000