Debt (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended				9 Months Ended	12 Months Ended
	Apr. 29, 2016	Mar. 31, 2014	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement								$ 1,000,000,000
Proceeds from Lines of Credit								315,000,000
Repayments of Lines of Credit								(315,000,000)
Letters of Credit Outstanding, Amount								$ 4,400,000
Effective interest rate on debt								0.00%	2.572%
Long-term debt								$ 2,235,137,000	$ 1,040,040,000
Gains (Losses) on Extinguishment of Debt		$ (7,700,000)						8,718,000	1,370,000	$ 7,677,000
Repayment of term loan				$ 39,500,000		$ 39,500,000		$ 350,000,000	0	$ 0
Proceeds from Loans	$ 350,000,000
Debt Instrument, Maturity Date								Apr. 01, 2026
Plains [Member] | Lease [Member]
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt							$ (8,700,000)
Proceeds from Sale of Machinery and Equipment							40,000,000
HEP
Debt Instrument [Line Items]
Proceeds from Lines of Credit								$ 554,000,000
Repayments of Lines of Credit								(713,000,000)
Borrowings outstanding under revolving credit agreement				$ 1,200,000,000			$ 1,200,000,000	553,000,000	712,000,000
Senior notes								723,750,000	295,500,000
Gains (Losses) on Extinguishment of Debt						(8,700,000)
Extinguishment of Debt, Amount						$ 30,800,000
Nine Point Eight Seven Five Percentage Senior Notes Due Two Thousand Seventeen Member
Debt Instrument [Line Items]
Stated interest rate, senior notes												9.875%
Letter of Credit [Member] | HEP
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement								50,000,000
Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty-Six [Member] [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes						5.875%
Senior notes								$ 1,022,500,000
6.875% Senior Notes Due 2018
Debt Instrument [Line Items]
Stated interest rate, senior notes					6.875%			6.875%
Gains (Losses) on Extinguishment of Debt					$ (1,400,000)
Redemption premium on early extinguishment of debt					(5,200,000)
Amortization of Debt Discount (Premium)					3,800,000
Extinguishment of Debt, Amount					$ 155,200,000
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date							Apr. 01, 2019
8.25% Senior Notes Due 2018 | HEP
Debt Instrument [Line Items]
Stated interest rate, senior notes								8.25%			8.25%
Redemption premium on early extinguishment of debt		6,200,000
Senior Notes Aggregate Redemption Amount											$ 156,200,000
Amortization of Financing Costs and Discounts		$ 1,500,000
Debt Instrument, Maturity Date		Mar. 01, 2018
6.5% Senior Notes Due 2020
Debt Instrument [Line Items]
Stated interest rate, senior notes						6.50%
6.5% Senior Notes Due 2020 | HEP
Debt Instrument [Line Items]
Stated interest rate, senior notes								6.50%
Long-term debt								$ 297,519,000	$ 296,752,000
Debt Instrument, Maturity Date							Mar. 01, 2020
Six Percent Senior Notes Due Two Thousand Twenty Four [Member] [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes						6.00%
Six Percent Senior Notes Due Two Thousand Twenty Four [Member] [Member] | HEP
Debt Instrument [Line Items]
Stated interest rate, senior notes								6.00%
Subsequent Event [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement			$ 1,350,000,000
Subsequent Event [Member] | 6.5% Senior Notes Due 2020 | HEP
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			(12,200,000)
Senior Notes			300,000,000
Extinguishment of Debt, Amount			$ 316,400,000