Supplemental Guarantor/Non-Guarantor Financial Information Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 246,892	$ 394,929
Additions to properties, plants and equipment	(134,186)	(103,677)
Purchases of marketable securities	(118,816)	(244,030)
Sales and maturities of marketable securities	178,524	253,676
Other, net	814	1,586
Net Advances to Parent	0hfc_NetIntercompanyInvestingActivities	0hfc_NetIntercompanyInvestingActivities
Net cash used for investing activities	(112,097)	(113,049)
Net repayments under credit agreement – HEP		(174,700)us-gaap_RepaymentsOfLinesOfCredit
Net borrowings under credit agreement – HEP	(23,000)us-gaap_ProceedsFromLinesOfCredit
Redemption of Senior Notes - HEP		(156,188)us-gaap_EarlyRepaymentOfSeniorDebt
Proceeds from product financing arrangement	7,434	21,126
Purchase of treasury stock	(55,065)	(13,988)
Dividends	(62,335)us-gaap_PaymentsOfDividendsCommonStock	(158,614)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit from equity based compensation	0	5,156
Other, net	(1,250)	(659)
Net advances from subsidiaries	0hfc_NetIntercompanyFinancingActivities	0hfc_NetIntercompanyFinancingActivities
Net cash provided by (used for) financing activities	(108,688)	(147,348)
Increase (decrease) for the period	26,107	134,532
Beginning of period	567,985	940,103
End of period	594,092	1,074,635
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(68,504)	(23,564)
Additions to properties, plants and equipment	(3,124)	(3,163)
Proceeds from sale of assets	0
Purchases of marketable securities	(118,816)	(244,030)
Sales and maturities of marketable securities	178,524	253,676
Other, net		0
Net Advances to Parent	0	0
Net cash used for investing activities	56,584	6,483
Net borrowings under credit agreement – HEP	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement	0
Purchase of treasury stock	(55,065)	(13,988)
Dividends	(62,335)	(158,614)
Payments to Noncontrolling Interests	0	0
Excess tax benefit from equity based compensation		5,156
Other, net	(570)	0
Net advances from subsidiaries	153,056	320,185
Net cash provided by (used for) financing activities	35,086	152,739
Increase (decrease) for the period	23,166	135,658
Beginning of period	565,080	931,920
End of period	588,246	1,067,578
Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from sale of assets	814
Proceeds from product financing arrangement	7,434
Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	258,441	381,180
Additions to properties, plants and equipment	(131,006)	(100,483)
Purchases of marketable securities	0	0
Sales and maturities of marketable securities	0	0
Other, net		1,586
Net Advances to Parent	(135,235)	(302,773)
Net cash used for investing activities	(265,427)	(401,670)
Net borrowings under credit agreement – HEP	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement		(21,126)
Purchase of treasury stock	0	0
Dividends	0	0
Payments to Noncontrolling Interests	0	0
Excess tax benefit from equity based compensation		0
Other, net	(448)	(398)
Net advances from subsidiaries	0	0
Net cash provided by (used for) financing activities	6,986	20,728
Increase (decrease) for the period	0	238
Beginning of period	0	1,817
End of period	0	2,055
Non Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	17,831	17,477
Additions to properties, plants and equipment	(56)	(31)
Proceeds from sale of assets	0
Purchases of marketable securities	0	0
Sales and maturities of marketable securities	0	0
Other, net		0
Net Advances to Parent	(17,821)	(17,412)
Net cash used for investing activities	(17,877)	(17,443)
Net borrowings under credit agreement – HEP	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement	0
Purchase of treasury stock	0	0
Dividends	0	0
Payments to Noncontrolling Interests	0	0
Excess tax benefit from equity based compensation		0
Other, net	15	75
Net advances from subsidiaries	0	0
Net cash provided by (used for) financing activities	15	75
Increase (decrease) for the period	(31)	109
Beginning of period	75	14
End of period	44	123
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	0
Additions to properties, plants and equipment	0	0
Proceeds from sale of assets	0
Purchases of marketable securities	0	0
Sales and maturities of marketable securities	0	0
Other, net		0
Net Advances to Parent	153,056	320,185
Net cash used for investing activities	153,056	320,185
Net repayments under credit agreement – HEP		0
Net borrowings under credit agreement – HEP	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement	0
Purchase of treasury stock	0	0
Dividends	0	0
Payments to Noncontrolling Interests	0	0
Excess tax benefit from equity based compensation		0
Other, net	0	0
Net advances from subsidiaries	153,056	320,185
Net cash provided by (used for) financing activities	(153,056)	(320,185)
Increase (decrease) for the period	0	0
Beginning of period	0	0
End of period	0	0
Holly Frontier Corp. Before Consolidation Of HEP [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	207,768	375,093
Additions to properties, plants and equipment	(134,186)	(103,677)
Proceeds from sale of assets	814
Purchases of marketable securities	(118,816)	(244,030)
Sales and maturities of marketable securities	178,524	253,676
Other, net		1,586
Net Advances to Parent	0	0
Net cash used for investing activities	(73,664)	(92,445)
Net borrowings under credit agreement – HEP	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement	7,434	(21,126)
Purchase of treasury stock	(55,065)	(13,988)
Dividends	(62,335)	(158,614)
Payments to Noncontrolling Interests	0	0
Excess tax benefit from equity based compensation		5,156
Other, net	(1,003)	(323)
Net advances from subsidiaries	0	0
Net cash provided by (used for) financing activities	(110,969)	(146,643)
Increase (decrease) for the period	23,135	136,005
Beginning of period	565,155	933,751
End of period	588,290	1,069,756
Non-Guarantor Non-Restricted Subsidiaries (HEP Segment) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	60,767	39,047
Additions to properties, plants and equipment	0	(20,604)
Proceeds from sale of assets	0
Purchases of marketable securities	0	0
Sales and maturities of marketable securities	0	0
Other, net		0
Net Advances to Parent	0	0
Net cash used for investing activities	(38,433)	(20,604)
Net repayments under credit agreement – HEP		(174,700)
Net borrowings under credit agreement – HEP	23,000
Redemption of Senior Notes - HEP		(156,188)
Proceeds from product financing arrangement	0	0
Purchase of treasury stock	0	0
Dividends	0	0
Payments to Noncontrolling Interests	42,115	38,092
Excess tax benefit from equity based compensation		0
Other, net		(336)
Net advances from subsidiaries	0	0
Net cash provided by (used for) financing activities	(19,362)	(19,916)
Increase (decrease) for the period	2,972	(1,473)
Beginning of period	2,830	6,352
End of period	5,802	4,879
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(21,643)	(19,211)
Additions to properties, plants and equipment	0	0
Purchases of marketable securities	0	0
Sales and maturities of marketable securities	0	0
Other, net		0
Net Advances to Parent	0	0
Net cash used for investing activities	0	0
Redemption of Senior Notes - HEP		0
Proceeds from product financing arrangement	0	0
Purchase of treasury stock	0	0
Dividends	0	0
Payments to Noncontrolling Interests	(21,643)	(19,211)
Excess tax benefit from equity based compensation		0
Other, net	0	0
Net advances from subsidiaries	0	0
Net cash provided by (used for) financing activities	21,643	19,211
Increase (decrease) for the period	0	0
Beginning of period	0	0
End of period	0	0
HEP [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	(38,433)	(20,604)
Proceeds from sale of assets	814
Principal tender on senior notes - HEP	0	(156,188)
Payments to Noncontrolling Interests	20,472	18,881
Other, net	(247)
Beginning of period	2,830
End of period	5,802
HEP [Member] \| Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0	0
Net repayments under credit agreement – HEP		0
HEP [Member] \| Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0	0
Net repayments under credit agreement – HEP		0
HEP [Member] \| Non Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0	0
Net repayments under credit agreement – HEP		0
HEP [Member] \| Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0
HEP [Member] \| Holly Frontier Corp. Before Consolidation Of HEP [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0	0
Net repayments under credit agreement – HEP		0
HEP [Member] \| Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Additions to properties, plants and equipment	0	0
Proceeds from sale of assets	0
Net repayments under credit agreement – HEP		0
Net borrowings under credit agreement – HEP	$ 0

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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