Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Apr. 28, 2015	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Capitalized Interest Costs, Including Allowance for Funds Used During Construction	$ 2,500	$ 3,100		$ 5,400	$ 6,000
Maximum borrowing capacity under revolving credit agreement	1,000,000			1,000,000
Letters of Credit Outstanding, Amount	4,600			4,600
Gains (Losses) on Extinguishment of Debt	$ (1,368)	$ 0		$ (1,368)	(7,677)
6.875% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes	6.875%			6.875%
Extinguishment of Debt, Amount	$ 155,200
Gains (Losses) on Extinguishment of Debt	(1,400)
Redemption Premium	5,200
Amortization of Financing Costs and Discounts	(3,800)
Senior notes	150,000			$ 150,000				$ 150,000
Plains [Member] | Lease [Member]
Debt Instrument [Line Items]
Proceeds from sale of storage assets				$ 40,000
Term of lease, years				15 years
HEP [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement	850,000			$ 850,000		$ 850,000	$ 650,000
Borrowings outstanding under revolving credit agreement	$ 604,000			$ 604,000
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
Gains (Losses) on Extinguishment of Debt					$ (7,677)
Redemption Premium			6,200
Amortization of Financing Costs and Discounts			1,500
Debt Instrument, Face Amount			$ 150,000
HEP [Member] | 6.5% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes	6.50%			6.50%
Senior notes	$ 300,000			$ 300,000				300,000
HEP [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement	50,000			50,000
HEP [Member] | Holly Energy Partners Credit Agreement [Member]
Debt Instrument [Line Items]
Borrowings outstanding under revolving credit agreement	$ 604,000			$ 604,000				$ 571,000