HF Sinclair 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	HollyFrontier Corp
Entity Central Index Key	48039
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		194,702,524

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents (HEP: $5,802 and $2,830, respectively)	$594,092	$567,985
Marketable securities	414,507	474,110
Total cash, cash equivalents and short-term marketable securities	1,008,599	1,042,095
Accounts receivable: Product and transportation (HEP: $39,855 and $40,129, respectively)	504,864	507,040
Crude oil resales	21,989	82,865
Accounts receivable, total	526,853	589,905
Inventories: Crude oil and refined products	998,936	920,104
Materials and supplies (HEP: $1,961 and $1,940, respectively)	116,742	115,027
Inventories, total	1,115,678	1,035,131
Income taxes receivable	0	11,719
Prepayments and other (HEP: $2,428 and $2,443, respectively)	64,648	104,148
Total current assets	2,715,778	2,782,998
Properties, plants and equipment, at cost (HEP: $1,305,065 and $1,269,161, respectively)	5,011,673	4,852,441
Less accumulated depreciation (HEP: $(258,078) and $(244,850), respectively)	-1,230,513	-1,181,902
Property, plants and equipment, net	3,781,160	3,670,539
Other Deferred Costs, Net	254,639	257,153
Goodwill (HEP: $288,991 and $288,991, respectively)	2,331,781	2,331,781
Intangibles and other (HEP: $71,995 and $73,928, respectively)	178,769	188,169
Other assets, total	2,765,189	2,777,103
Total assets	9,262,127	9,230,640
Current liabilities:
Accounts payable (HEP: $28,491 and $17,881, respectively)	930,909	1,108,138
Income taxes payable	112,016	19,642
Accrued liabilities (HEP: $16,771 and $26,321, respectively)	112,975	106,214
Deferred income tax liabilities	16,503	17,409
Total current liabilities	1,172,403	1,251,403
Long-term debt (HEP: $890,742 and $867,579, respectively)	1,077,369	1,054,890
Deferred income taxes (HEP: $420 and $367, respectively)	631,030	646,870
Other long-term liabilities (HEP: $52,322 and $47,170, respectively)	181,822	176,758
HollyFrontier stockholders' equity:
Preferred stock, $1.00 par value - 5,000,000 shares authorized; none issued	0	0
Common stock $.01 par value - 320,000,000 shares authorized; 255,962,866 shares issued as of March 31, 2015 and December 31, 2014	2,560	2,560
Additional capital	4,009,507	4,003,628
Retained earnings	2,942,707	2,778,577
Accumulated other comprehensive income (loss)	16,372	27,894
Common stock held in treasury, at cost - 61,260,342 and 59,876,776 shares as of March 31, 2015 and December 31, 2014, respectively	-1,344,300	-1,289,075
Total HollyFrontier stockholders' equity	5,626,846	5,523,584
Noncontrolling interest	572,657	577,135
Total equity	6,199,503	6,100,719
Total liabilities and equity	9,262,127	9,230,640
HEP [Member]
Current assets:
Cash and cash equivalents (HEP: $5,802 and $2,830, respectively)	5,802	2,830
Total cash, cash equivalents and short-term marketable securities	5,802	2,830
Accounts receivable: Product and transportation (HEP: $39,855 and $40,129, respectively)	39,855	40,129
Materials and supplies (HEP: $1,961 and $1,940, respectively)	1,961	1,940
Prepayments and other (HEP: $2,428 and $2,443, respectively)	2,428	2,443
Properties, plants and equipment, at cost (HEP: $1,305,065 and $1,269,161, respectively)	1,305,065	1,269,161
Less accumulated depreciation (HEP: $(258,078) and $(244,850), respectively)	-258,078	-244,850
Goodwill (HEP: $288,991 and $288,991, respectively)	288,991	288,991
Intangibles and other (HEP: $71,995 and $73,928, respectively)	71,995	73,928
Total assets	1,458,019	1,434,572
Current liabilities:
Accounts payable (HEP: $28,491 and $17,881, respectively)	28,491	17,881
Accrued liabilities (HEP: $16,771 and $26,321, respectively)	16,771	26,321
Long-term debt (HEP: $890,742 and $867,579, respectively)	890,742	867,579
Deferred income taxes (HEP: $420 and $367, respectively)	420	367
Other long-term liabilities (HEP: $52,322 and $47,170, respectively)	$52,322	$47,170

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Cash and cash equivalents (HEP: $5,802 and $2,830, respectively)	$594,092	$567,985
Accounts receivable Product and transportation	504,864	507,040
Materials and supplies (HEP: $1,961 and $1,940, respectively)	116,742	115,027
Prepayments and other (HEP: $2,428 and $2,443, respectively)	64,648	104,148
Property, Plant and Equipment, Gross	5,011,673	4,852,441
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,230,513	1,181,902
Goodwill	2,331,781	2,331,781
Intangibles and other	178,769	188,169
Accounts payable (HEP: $28,491 and $17,881, respectively)	930,909	1,108,138
Accrued liabilities (HEP: $16,771 and $26,321, respectively)	112,975	106,214
Long-term debt (HEP: $890,742 and $867,579, respectively)	1,077,369	1,054,890
Deferred income taxes (HEP: $420 and $367, respectively)	631,030	646,870
Other long-term liabilities (HEP: $52,322 and $47,170, respectively)	181,822	176,758
HollyFrontier Stockholders' Equity:
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	320,000,000	320,000,000
Common stock, shares issued	255,962,866	255,962,866
Preferred stock, par value	$1	$1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Treasury stock, shares	61,260,342	59,876,776
HEP [Member]
Cash and cash equivalents (HEP: $5,802 and $2,830, respectively)	5,802	2,830
Accounts receivable Product and transportation	39,855	40,129
Materials and supplies (HEP: $1,961 and $1,940, respectively)	1,961	1,940
Prepayments and other (HEP: $2,428 and $2,443, respectively)	2,428	2,443
Property, Plant and Equipment, Gross	1,305,065	1,269,161
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	258,078	244,850
Goodwill	288,991	288,991
Intangibles and other	71,995	73,928
Accounts payable (HEP: $28,491 and $17,881, respectively)	28,491	17,881
Accrued liabilities (HEP: $16,771 and $26,321, respectively)	16,771	26,321
Long-term debt (HEP: $890,742 and $867,579, respectively)	890,742	867,579
Deferred income taxes (HEP: $420 and $367, respectively)	420	367
Other long-term liabilities (HEP: $52,322 and $47,170, respectively)	$52,322	$47,170

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Sales and other revenues	$3,006,626	$4,791,053
Operating costs and expenses:
Cost of products sold (exclusive of depreciation and amortization)	2,251,373	4,138,620
Lower of cost or market inventory valuation adjustment	-6,546	0
Refining and Marketing Costs, net	2,244,827	4,138,620
Operating expenses (exclusive of depreciation and amortization)	263,596	273,966
General and administrative expenses (exclusive of depreciation and amortization)	29,569	26,923
Depreciation and amortization	80,012	80,548
Total operating costs and expenses	2,618,004	4,520,057
Income from operations	388,622	270,996
Other income (expense):
Earnings (loss) of equity method investments	-7,807	-801
Interest income	962	1,405
Interest expense	-10,154	-12,347
Gain on sale of assets	766	0
Loss on early extinguishment of debt	0	-7,677
Other income (expense) total	-16,233	-19,420
Income before income taxes	372,389	251,576
Income tax provision:
Current	139,198	93,293
Deferred	-9,470	-5,679
Income tax provision total	129,728	87,614
Net income	242,661	163,962
Less net income attributable to noncontrolling interest	15,785	11,901
Net income attributable to HollyFrontier stockholders	$226,876	$152,061
Earnings per share attributable to HollyFrontier stockholders:
Basic	$1.16	$0.76
Diluted	$1.16	$0.76
Cash dividends declared per common share	$0.32	$0.80
Average number of common shares outstanding:
Basic	195,069	198,297
Diluted	195,121	198,924

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$242,661	$163,962
Other comprehensive income (loss)
Unrealized gain (loss) on marketable securities	108	12
Reclassification adjustments to net income on sale or maturity of marketable securities	-40	-1
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	68	11
Change in fair value of cash flow hedging instruments	-15,428	92,035
Reclassification adjustments to net income on settlement of cash flow hedging instruments	-4,161	-5,222
Amortization of unrealized loss attributable to discontinued cash flow hedges	270	270
Net unrealized gain (loss) on hedging instruments	-19,319	87,083
Loss on post-retirement healthcare plan	0	-89
Net change in post-retirement benefit obligation	0	-89
Other comprehensive income (loss) before income taxes	-19,251	87,005
Income tax expense (benefit)	-7,275	33,705
Other comprehensive income (loss)	-11,976	53,300
Total comprehensive income	230,685	217,262
Less noncontrolling interest in comprehensive income	15,331	11,959
Comprehensive income attributable to HollyFrontier stockholders	$215,354	$205,303

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$242,661	$163,962
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	80,012	80,548
Lower of cost or market inventory valuation adjustment	-6,546	0
Net loss of equity method investments, inclusive of distributions	8,557	1,363
Loss on early extinguishment of debt attributable to unamortized discount	0	1,489
Gain on sale of assets	766	0
Deferred income taxes	-9,470	-5,679
Equity based compensation expense	7,225	6,186
Change in fair value - derivative instruments	2,223	-10,546
(Increase) decrease in current assets:
Accounts receivable	63,517	17,878
Inventories	-74,001	-236,045
Income taxes receivable	11,719	96,945
Prepayments and other	22,203	10,010
Increase (decrease) in current liabilities:
Accounts payable	-165,839	260,834
Income taxes payable	92,374	0
Accrued liabilities	-3,059	3,060
Turnaround expenditures	-29,100	-4,292
Other, net	5,182	9,216
Net cash provided by operating activities	246,892	394,929
Cash flows from investing activities:
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 cash used for investing activities	-112,097	-113,049
Cash flows from financing activities:
Early Repayment of Senior Debt		-156,188
Proceeds from product financing arrangement	7,434	21,126
Purchase of treasury stock	-55,065	-13,988
Dividends	-62,335	-158,614
Excess tax benefit from equity based compensation	0	5,156
Other, net	-1,250	-659
Net cash used for financing activities	-108,688	-147,348
Cash and cash equivalents:
Increase for the period	26,107	134,532
Beginning of period	567,985	940,103
End of period	594,092	1,074,635
Cash paid during the period for:
Interest	14,522	20,469
Income taxes	38,985	233
HEP [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,290	15,184
Cash flows from investing activities:
Additions to properties, plants and equipment	-38,433	-20,604
Proceeds from sale of assets	814
Cash flows from financing activities:
Borrowings under credit agreement - HEP	153,500	421,300
Repayments under credit agreement - HEP	-130,500	-246,600
Repayments of Senior Debt	0	-156,188
Distributions to noncontrolling interest	-20,472	-18,881
Other, net	-247
Cash and cash equivalents:
Beginning of period	2,830
End of period	$5,802

Description_of_Business_and_Pr

Description of Business and Presentation of Financial Statements	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description Of Business And Presentation Of Financial Statements	Description of Business and Presentation of Financial Statements
	References herein to HollyFrontier Corporation (“HollyFrontier”) include HollyFrontier and its consolidated subsidiaries. In accordance with the Securities and Exchange Commission’s (“SEC”) “Plain English” guidelines, this Quarterly Report on Form 10-Q has been written in the first person. In these financial statements, the words “we,” “our,” “ours” and “us” refer only to HollyFrontier and its consolidated subsidiaries or to HollyFrontier or an individual subsidiary and not to any other person, with certain exceptions. Generally, the words “we,” “our,” “ours” and “us” include Holly Energy Partners, L.P. (“HEP”) and its subsidiaries as consolidated subsidiaries of HollyFrontier, unless when used in disclosures of transactions or obligations between HEP and HollyFrontier or its other subsidiaries. These financial statements contain certain disclosures of agreements that are specific to HEP and its consolidated subsidiaries and do not necessarily represent obligations of HollyFrontier. When used in descriptions of agreements and transactions, “HEP” refers to HEP and its consolidated subsidiaries.
	We are principally an independent petroleum refiner that produces high-value light products such as gasoline, diesel fuel, jet fuel, specialty lubricant products, and specialty and modified asphalt. We own and operate petroleum refineries that serve markets throughout the Mid-Continent, Southwest and Rocky Mountain regions of the United States. As of March 31, 2015, we:
	•	owned and operated a petroleum refinery in El Dorado, Kansas (the “El Dorado Refinery”), two refinery facilities located in Tulsa, Oklahoma (collectively, the “Tulsa Refineries”), a refinery in Artesia, New Mexico that is operated in conjunction with crude oil distillation and vacuum distillation and other facilities situated 65 miles away in Lovington, New Mexico (collectively, the “Navajo Refinery”), a refinery located in Cheyenne, Wyoming (the “Cheyenne Refinery”) and a refinery in Woods Cross, Utah (the “Woods Cross Refinery”);
	•	owned and operated NK Asphalt Partners (“NK Asphalt”) which operates various asphalt terminals in Arizona, New Mexico and Oklahoma; and
	•	owned a 39% interest in HEP, a consolidated variable interest entity (“VIE”), which includes our 2% general partner interest. HEP owns and operates logistic assets consisting of petroleum product and crude oil pipelines and terminal, tankage and loading rack facilities that principally support our refining and marketing operations in the Mid-Continent, Southwest and Rocky Mountain regions of the United States and Alon USA, Inc.'s (“Alon”) refinery in Big Spring, Texas. Additionally, HEP owns a 75% interest in UNEV Pipeline, LLC (“UNEV”), which owns a 12-inch refined products pipeline from Salt Lake City, Utah to Las Vegas, Nevada, together with terminal facilities in the Cedar City, Utah and North Las Vegas areas (the “UNEV Pipeline”) and a 25% interest in SLC Pipeline LLC (the “SLC Pipeline”), which owns a 95-mile intrastate pipeline system that serves refineries in the Salt Lake City area.
	We have prepared these consolidated financial statements without audit. In management’s opinion, these consolidated financial statements include all normal recurring adjustments necessary for a fair presentation of our consolidated financial position as of March 31, 2015, the consolidated results of operations and comprehensive income for the three months ended March 31, 2015 and 2014 and consolidated cash flows for the three months ended March 31, 2015 and 2014 in accordance with the rules and regulations of the SEC. Although certain notes and other information required by generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted, we believe that the disclosures in these consolidated financial statements are adequate to make the information presented not misleading. These consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014 that has been filed with the SEC.
	Our results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results of operations to be realized for the year ending December 31, 2015.
	Accounts Receivable: Our accounts receivable consist of amounts due from customers that are primarily companies in the petroleum industry. Credit is extended based on our evaluation of the customer’s financial condition, and in certain circumstances collateral, such as letters of credit or guarantees, is required. We reserve for doubtful accounts based on our historical loss experience as well as specific accounts identified as high risk, which historically have been minimal. Credit losses are charged to the allowance for doubtful accounts when an account is deemed uncollectible. Our allowance for doubtful accounts was $2.4 million at March 31, 2015 and December 31, 2014.
	Inventories: Inventories are stated at the lower of cost, using the last-in, first-out (“LIFO”) method for crude oil, unfinished and finished refined products and the average cost method for materials and supplies, or market. In periods of rapidly declining prices, LIFO inventories may have to be written down to market value due to the higher costs assigned to LIFO layers in prior periods. In addition, the use of the LIFO inventory method may result in increases or decreases to cost of sales in years that inventory volumes decline as the result of charging cost of sales with LIFO inventory costs generated in prior periods. An actual valuation of inventory under the LIFO method is made at the end of each year based on the inventory levels at that time. Accordingly, interim LIFO calculations are based on management's estimates of expected year-end inventory levels and are subject to the final year-end LIFO inventory valuation.
	Goodwill: We have goodwill that primarily arose from our merger with Frontier Oil Corporation on July 1, 2011. Goodwill represents the excess of the cost of an acquired entity over the fair value of the assets acquired and liabilities assumed. Goodwill is not subject to amortization and is tested annually or more frequently if events or circumstances indicate the possibility of impairment. As of March 31, 2015, there have been no impairments to goodwill.
	New Accounting Pronouncements
	Revenue Recognition
	In May 2014, an accounting standard update (ASU 2014-09, “Revenue from Contracts with Customers”) was issued requiring revenue to be recognized when promised goods or services are transferred to customers in an amount that reflects the expected consideration for these goods or services. This standard has a proposed effective date of January 1, 2018, and we are evaluating the impact of this standard.

Variable_Interest_Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2015
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entity
	Holly Energy Partners
	HEP, a consolidated VIE, is a publicly held master limited partnership that was formed to acquire, own and operate the petroleum product and crude oil pipeline and terminal, tankage and loading rack facilities that support our refining and marketing operations in the Mid-Continent, Southwest and Rocky Mountain regions of the United States. HEP also owns and operates refined product pipelines and terminals, located primarily in Texas, that serve Alon's refinery in Big Spring, Texas.
	As of March 31, 2015, we owned a 39% interest in HEP, including the 2% general partner interest. As the general partner of HEP, we have the sole ability to direct the activities that most significantly impact HEP's financial performance, and therefore we consolidate HEP. See Note 16 for supplemental guarantor/non-guarantor financial information, including HEP balances included in these consolidated financial statements.
	HEP has two primary customers (including us) and generates revenues by charging tariffs for transporting petroleum products and crude oil though its pipelines, by charging fees for terminalling refined products and other hydrocarbons, and storing and providing other services at its storage tanks and terminals. Under our long-term transportation agreements with HEP (discussed further below), we accounted for 81% of HEP’s total revenues for the three months ended March 31, 2015. We do not provide financial or equity support through any liquidity arrangements and / or debt guarantees to HEP.
	HEP has outstanding debt under a senior secured revolving credit agreement and its senior notes. With the exception of the assets of HEP Logistics Holdings, L.P., one of our wholly-owned subsidiaries and HEP’s general partner, HEP’s creditors have no recourse to our other assets. Any recourse to HEP’s general partner would be limited to the extent of HEP Logistics Holdings, L.P.’s assets, which other than its investment in HEP are not significant. Furthermore, our creditors have no recourse to the assets of HEP and its consolidated subsidiaries. See Note 9 for a description of HEP’s debt obligations.
	HEP has risk associated with its operations. If a major customer of HEP were to terminate its contracts or fail to meet desired shipping or throughput levels for an extended period of time, revenue would be reduced and HEP could suffer substantial losses to the extent that a new customer is not found. In the event that HEP incurs a loss, our operating results will reflect HEP’s loss, net of intercompany eliminations, to the extent of our ownership interest in HEP at that point in time.
	Transportation Agreements
	HEP serves our refineries under long-term pipeline and terminal, tankage and throughput agreements expiring from 2019 through 2026. Under these agreements, we pay HEP fees to transport, store and throughput volumes of refined product and crude oil on HEP's pipeline and terminal, tankage and loading rack facilities that result in minimum annual payments to HEP including UNEV (a consolidated subsidiary of HEP). Under these agreements, the agreed upon tariff rates are subject to annual tariff rate adjustments on July 1 at a rate based upon the percentage change in Producer Price Index or Federal Energy Regulatory Commission index. As of March 31, 2015, these agreements result in minimum annualized payments to HEP of $231.6 million.
	Our transactions with HEP including fees paid under our transportation agreements with HEP and UNEV are eliminated and have no impact on our consolidated financial statements.

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2015
Financial Instruments, Owned, at Fair Value [Abstract]
Financial Instruments	Financial Instruments
	Our financial instruments consist of cash and cash equivalents, investments in marketable securities, accounts receivable, accounts payable, debt and derivative instruments. The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value. HEP's outstanding credit agreement borrowings also approximate fair value as interest rates are reset frequently at current interest rates.
	Fair value measurements are derived using inputs (assumptions that market participants would use in pricing an asset or liability, including assumptions about risk). GAAP categorizes inputs used in fair value measurements into three broad levels as follows:
	•	(Level 1) Quoted prices in active markets for identical assets or liabilities.
	•	(Level 2) Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, similar assets and liabilities in markets that are not active or can be corroborated by observable market data.
	•	(Level 3) Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes valuation techniques that involve significant unobservable inputs.
	The carrying amounts and estimated fair values of our investments in marketable securities, derivative instruments and senior notes at March 31, 2015 and December 31, 2014 were as follows:
									Fair Value by Input Level
	Financial Instrument		Carrying Amount			Fair Value			Level 1		Level 2		Level 3
			(In thousands)
	March 31, 2015
	Assets:
	Marketable securities		$	414,507		$	414,507		$	—	$	414,507	$	—
	NYMEX futures contracts		6,465			6,465			6,465		—		—
	Commodity price swaps		192,628			192,628			—		192,628		—
	Forward contracts		2,167			2,167			—		1,566		601
	HEP interest rate swaps		147			147			—		147		—
	Total assets		$	615,914		$	615,914		$	6,465	$	608,848	$	601
	Liabilities:
	Commodity price swaps		$	192,555		$	192,555		$	—	$	192,555	$	—
	Forward contracts		3,352			3,352			—		199		3,153
	HollyFrontier senior notes		153,908			154,500			—		154,500		—
	HEP senior notes		296,742			295,500			—		295,500		—
	HEP interest rate swaps		942			942			—		942		—
	Total liabilities		$	647,499		$	646,849		$	—	$	643,696	$	3,153
									Fair Value by Input Level
	Financial Instrument		Carrying Amount			Fair Value			Level 1		Level 2		Level 3
			(In thousands)
	December 31, 2014
	Assets:
	Marketable securities		$	474,110		$	474,110		$	—	$	474,110	$	—
	NYMEX futures contracts		17,619			17,619			17,619		—		—
	Commodity price swaps		208,296			208,296			—		208,296		—
	HEP interest rate swaps		1,019			1,019			—		1,019		—
	Total assets		$	701,044		$	701,044		$	17,619	$	683,425	$	—
	Liabilities:
	Commodity price swaps		$	196,897		$	196,897		$	—	$	196,897	$	—
	HollyFrontier senior notes		154,144			155,250			—		155,250		—
	HEP senior notes		296,579			291,000			—		291,000		—
	HEP interest rate swaps		1,065			1,065			—		1,065		—
	Total liabilities		$	648,685		$	644,212		$	—	$	644,212	$	—
	Level 1 Financial Instruments
	Our NYMEX futures contracts are exchange traded and are measured and recorded at fair value using quoted market prices, a Level 1 input.
	Level 2 Financial Instruments
	Investments in marketable securities and derivative instruments consisting of commodity price swaps, forward sales and purchase contracts and HEP's interest rate swaps are measured and recorded at fair value using Level 2 inputs. The fair values of the commodity price and interest rate swap contracts are based on the net present value of expected future cash flows related to both variable and fixed rate legs of the respective swap agreements. The measurements are computed using market-based observable inputs, quoted forward commodity prices with respect to our commodity price swaps and the forward London Interbank Offered Rate (“LIBOR”) yield curve with respect to HEP's interest rate swaps. The fair value of the marketable securities and senior notes is based on values provided by a third-party, which were derived using market quotes for similar type instruments, a Level 2 input.
	Level 3 Financial Instruments
	We have forward commodity sales and purchase contracts for which quoted forward market prices are not readily available. The forward rate used to value these forward sales and purchase contracts are derived using a projected forward rate using quoted market rates for similar products, adjusted for regional pricing and grade differentials, a Level 3 input.
	The following table presents the changes in fair value of our Level 3 assets and liabilities (all related to derivative instruments) for the three months ended March 31, 2015 and 2014:
			Three Months Ended March 31,
	Level 3 Financial Instruments		2015			2014
			(In thousands)
	Liability balance at beginning of period		$	—		$	(35,318	)
	Change in fair value:
	Recognized in other comprehensive income		(2,552		)	(22,137		)
	Recognized in cost of products sold		—			8,970
	Settlement date fair value of contractual maturities:
	Recognized in sales and other revenues		—			25,331
	Recognized in cost of products sold		—			681
	Liability balance at end of period		$	(2,552	)	$	(22,473	)
	A hypothetical change of 10% to the estimated future cash flows attributable to our Level 3 forward commodity sales and purchase contracts would result in an immaterial change in the fair value.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	Basic earnings per share is calculated as net income attributable to HollyFrontier stockholders divided by the average number of shares of common stock outstanding. Diluted earnings per share assumes, when dilutive, the issuance of the net incremental shares from restricted shares and performance share units. The following is a reconciliation of the components of the basic and diluted per share computations for net income attributable to HollyFrontier stockholders:
		Three Months Ended March 31,
		2015		2014
		(In thousands, except per share data)
	Net income attributable to HollyFrontier stockholders	$	226,876	$	152,061
	Participating securities' share in earnings	644		466
	Net income attributable to common shares	$	226,232	$	151,595
	Average number of shares of common stock outstanding	195,069		198,297
	Effect of dilutive variable restricted shares and performance share units (1)	52		627
	Average number of shares of common stock outstanding assuming dilution	195,121		198,924
	Basic earnings per share	$	1.16	$	0.76
	Diluted earnings per share	$	1.16	$	0.76
	(1) Excludes anti-dilutive restricted and performance share units of:	412		14

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	As of March 31, 2015, we have two principal share-based compensation plans (collectively, the “Long-Term Incentive Compensation Plan”).
	The compensation cost charged against income for these plans was $6.3 million and $5.4 million for the three months ended March 31, 2015 and 2014, respectively. Our accounting policy for the recognition of compensation expense for awards with pro-rata vesting is to expense the costs ratably over the vesting periods.
	Additionally, HEP maintains a share-based compensation plan for Holly Logistic Services, L.L.C.'s non-employee directors and certain executives and employees. Compensation cost attributable to HEP’s share-based compensation plan was $0.9 million and $0.8 million for the three months ended March 31, 2015 and 2014, respectively.
	Restricted Stock and Restricted Stock Units
	Under our Long-Term Incentive Compensation Plan, we grant certain officers and other key employees restricted stock and restricted stock unit awards with awards generally vesting over a period of one to three years. Restricted stock award recipients are generally entitled to all the rights of absolute ownership of the restricted shares from the date of grant including the right to vote the shares and to receive dividends. Upon vesting, restrictions on the restricted shares lapse at which time they convert to common shares. In addition, we grant non-employee directors restricted stock unit awards, which typically vest over a period of one year and are payable in stock. The fair value of each restricted stock and restricted stock unit award is measured based on the grant date market price of our common shares and is amortized over the respective vesting period.
	A summary of restricted stock and restricted stock unit activity and changes during the three months ended March 31, 2015 is presented below:
	Restricted Stock and Restricted Stock Units	Grants		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value ($000)
	Outstanding at January 1, 2015 (non-vested)	669,777		$	40.49
	Granted	8,132		36.59
	Vesting (transfer/conversion to common stock)	(2,999	)	44.48
	Forfeited	(6,046	)	43.78
	Outstanding at March 31, 2015 (non-vested)	668,864		$	44.03	$	26,935
	For the three months ended March 31, 2015, 2,999 restricted stock and restricted stock units vested having a grant date fair value of $0.1 million. As of March 31, 2015, there was $17.4 million of total unrecognized compensation cost related to non-vested restricted stock and restricted stock unit grants. That cost is expected to be recognized over a weighted-average period of 1.3 years.
	Performance Share Units
	Under our Long-Term Incentive Compensation Plan, we grant certain officers and other key employees performance share units, which are payable in stock upon meeting certain criteria over the service period, and generally vest over a period of three years. Under the terms of our performance share unit grants, awards are subject to “financial performance” and “market performance” criteria. Financial performance is based on our financial performance compared to a peer group of independent refining companies, while market performance is based on the relative standing of total shareholder return achieved by HollyFrontier compared to peer group companies. The number of shares ultimately issued under these awards can range from zero to 200%. As of March 31, 2015, estimated share payouts for outstanding non-vested performance share unit awards averaged approximately 50% .
	A summary of performance share unit activity and changes during the three months ended March 31, 2015 is presented below:
	Performance Share Units	Grants
	Outstanding at January 1, 2015 (non-vested)	725,054
	Granted	3,654
	Forfeited	(11,774	)
	Outstanding at March 31, 2015 (non-vested)	716,934
	As of March 31, 2015, there was $17.6 million of total unrecognized compensation cost related to non-vested performance share units having a grant date fair value of $43.67 per unit. That cost is expected to be recognized over a weighted-average period of 1.8 years.

Cash_and_Cash_Equivalents_and_

Cash and Cash Equivalents and Investments in Marketable Securities	3 Months Ended
	Mar. 31, 2015
Cash And Cash Equivalents And Investments In Marketable Securities [Abstract]
Cash And Cash Equivalents And Investments In Marketable Securities	Cash and Cash Equivalents and Investments in Marketable Securities
	Our investment portfolio at March 31, 2015 consisted of cash, cash equivalents and investments in marketable securities.
	We currently invest in marketable debt securities with the maximum maturity or put date of any individual issue generally not greater than one year from the date of purchase, which are usually held until maturity. All of these instruments are classified as available-for-sale. As a result, they are reported at fair value using quoted market prices. Interest income is recorded as earned. Unrealized gains and losses, net of related income taxes, are reported as a component of accumulated other comprehensive income. Upon sale or maturity, realized gains on our marketable debt securities are recognized as interest income. These gains are computed based on the specific identification of the underlying cost of the securities, net of unrealized gains and losses previously reported in other comprehensive income. Unrealized gains and losses on our available-for-sale securities are due to changes in market prices and are considered temporary.
	The following is a summary of our marketable securities:
		Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
									(Net Carrying Amount)
		(In thousands)
	March 31, 2015
	Certificates of deposit	$	27,000	$	4	$	—		$	27,004
	Commercial paper	46,375		16		(3		)	46,388
	Corporate debt securities	112,175		12		(47		)	112,140
	State and political subdivisions debt securities	229,039		11		(75		)	228,975
	Total marketable securities	$	414,589	$	43	$	(125	)	$	414,507
	December 31, 2014
	Certificates of deposit	$	54,000	$	10	$	—		$	54,010
	Commercial paper	52,297		7		(4		)	52,300
	Corporate debt securities	136,181		1		(94		)	136,088
	State and political subdivisions debt securities	231,819		5		(112		)	231,712
	Total marketable securities	$	474,297	$	23	$	(210	)	$	474,110
	Interest income recognized on our marketable securities was $0.5 million and $0.6 million for the three months ended March 31, 2015 and 2014, respectively.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Inventories	Inventories
	Inventory consists of the following components:
			March 31,			December 31, 2014
			2015
			(In thousands)
	Crude oil		$	575,714		$	581,592
	Other raw materials and unfinished products(1)		199,608			204,467
	Finished products(2)		614,546			531,523
	Lower of cost or market reserve		(390,932		)	(397,478		)
	Process chemicals(3)		4,563			4,028
	Repair and maintenance supplies and other		112,179			110,999
	Total inventory		$	1,115,678		$	1,035,131
	-1	Other raw materials and unfinished products include feedstocks and blendstocks, other than crude.
	-2	Finished products include gasolines, jet fuels, diesels, lubricants, asphalts, LPG’s and residual fuels.
	-3	Process chemicals include additives and other chemicals.
	Inventories, which are valued at the lower of LIFO cost or market, reflect a valuation reserve of $390.9 million and $397.5 million at March 31, 2015 and December 31, 2014, respectively. The December 31, 2014 market reserve of $397.5 million was reversed and reduced cost of products sold during the first quarter of 2015, due to the sale of inventory quantities that gave rise to the reserve. A new market reserve of $390.9 million was established as of March 31, 2015 based on market conditions and prices at that time.

Environmental

Environmental	3 Months Ended
	Mar. 31, 2015
Environmental Expense and Liabilities [Abstract]
Environmental	Environmental
	We expensed $4.6 million and $0.3 million for the three months ended March 31, 2015 and 2014, respectively, for environmental remediation obligations. The accrued environmental liability reflected in our consolidated balance sheets was $105.2 million and $104.5 million at March 31, 2015 and December 31, 2014, respectively, of which $82.7 million and $81.8 million, respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time (up to 30 years for certain projects).

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt [Abstract]
Debt	Debt
	HollyFrontier Credit Agreement
	We have a $1 billion senior unsecured revolving credit facility maturing in July 2019 (the “HollyFrontier Credit Agreement”), which may be used for revolving credit loans and letters of credit from time to time and is available to fund general corporate purposes. Indebtedness under the HollyFrontier Credit Agreement is recourse to HollyFrontier and guaranteed by certain of our wholly-owned subsidiaries. At March 31, 2015, we were in compliance with all covenants, had no outstanding borrowings and had outstanding letters of credit totaling $4.7 million under the HollyFrontier Credit Agreement.
	HEP Credit Agreement
	At March 31, 2015, HEP had a $650 million senior secured revolving credit facility expiring in November 2018 (the “HEP Credit Agreement”) with an outstanding balance of $594.0 million and no outstanding letters of credit. At March 31, 2015, HEP was in compliance with all of its covenants. On April 28, 2015, the HEP Credit Agreement was amended, increasing the size of the credit facility from $650 million to $850 million (the “HEP Amended Credit Agreement”) and is available to fund capital expenditures, investments, acquisitions, distribution payments and working capital and for general partnership purposes. It is also available to fund letters of credit up to a $50 million sub-limit. The HEP Amended Credit Agreement matures in November 2018.
	HEP’s obligations under the HEP Credit Agreement are collateralized by substantially all of HEP’s assets. Indebtedness under the HEP Credit Agreement involves recourse to HEP Logistics Holdings, L.P., its general partner, and is guaranteed by HEP’s wholly-owned subsidiaries. Any recourse to the general partner would be limited to the extent of HEP Logistics Holdings, L.P.’s assets, which other than its investment in HEP are not significant. HEP’s creditors have no recourse to our other assets. Furthermore, our creditors have no recourse to the assets of HEP and its consolidated subsidiaries.
	HollyFrontier Senior Notes
	Our 6.875% senior notes ($150 million aggregate principal amount maturing November 2018) (the “HollyFrontier Senior Notes”) are unsecured and impose certain restrictive covenants, including limitations on our ability to incur additional debt, incur liens, enter into sale-and-leaseback transactions, pay dividends, enter into mergers, sell assets and enter into certain transactions with affiliates. Additionally, we have certain redemption rights under the HollyFrontier Senior Notes.
	At any time, following notice to the trustee, that the HollyFrontier Senior Notes are rated investment grade by both Moody's and Standard & Poor's and no default or event of default exists, we are not subject to many of the foregoing covenants (a "Covenant Suspension"). As of March 31, 2015, the HollyFrontier Senior Notes were rated investment grade by both Standard & Poor's (BBB-) and Moody's (Baa3). As a result, we are under the Covenant Suspension pursuant to the terms of the indenture governing the HollyFrontier Senior Notes.
	HollyFrontier Financing Obligation
	We have a financing obligation that relates to a sale and lease-back of certain crude oil tankage that we sold to an affiliate of Plains All American Pipeline, L.P. (“Plains”) in October 2009 for $40.0 million. Monthly lease payments are recorded as a reduction in principal over the 15-year lease term ending in 2024.
	HEP Senior Notes
	HEP’s 6.5% senior notes ($300 million aggregate principal amount maturing March 2020) (the “HEP Senior Notes”) are unsecured and impose certain restrictive covenants, including limitations on HEP’s ability to incur additional indebtedness, make investments, sell assets, incur certain liens, pay distributions, enter into transactions with affiliates, and enter into mergers. At any time when the HEP Senior Notes are rated investment grade by both Moody’s and Standard & Poor’s and no default or event of default exists, HEP will not be subject to many of the foregoing covenants. Additionally, HEP has certain redemption rights under the HEP Senior Notes.
	In March 2014, HEP redeemed its $150.0 million aggregate principal amount of 8.25% senior notes maturing March 2018 at a redemption cost of $156.2 million, at which time HEP recognized a $7.7 million early extinguishment loss consisting of a $6.2 million debt redemption premium and unamortized discount and financing costs of $1.5 million. HEP funded the redemption with borrowings under the HEP Credit Agreement.
	Indebtedness under the HEP Senior Notes involves recourse to HEP Logistics Holdings, L.P., its general partner, and is guaranteed by HEP’s wholly-owned subsidiaries. However, any recourse to the general partner would be limited to the extent of HEP Logistics Holdings, L.P.’s assets, which other than its investment in HEP, are not significant. HEP’s creditors have no recourse to our other assets. Furthermore, our creditors have no recourse to the assets of HEP and its consolidated subsidiaries.
	The carrying amounts of long-term debt are as follows:
		March 31,			December 31,
		2015			2014
		(In thousands)
	6.875% Senior Notes
	Principal	$	150,000		$	150,000
	Unamortized premium	3,908			4,144
		153,908			154,144
	Financing Obligation	32,719			33,167
	Total HollyFrontier long-term debt	186,627			187,311
	HEP Credit Agreement	594,000			571,000
	HEP 6.5% Senior Notes
	Principal	300,000			300,000
	Unamortized discount	(3,258		)	(3,421		)
		296,742			296,579
	Total HEP long-term debt	890,742			867,579
	Total long-term debt	$	1,077,369		$	1,054,890
	We capitalized interest attributable to construction projects of $2.9 million and $3.0 million for the three months ended March 31, 2015 and 2014, respectively.

Derivative_Instruments_And_Hed

Derivative Instruments And Hedging Activities	3 Months Ended
	Mar. 31, 2015
Derivative Instruments And Hedging Activities [Abstract]
Derivative Instruments And Hedging Activities	Derivative Instruments and Hedging Activities
	Commodity Price Risk Management
	Our primary market risk is commodity price risk. We are exposed to market risks related to the volatility in crude oil and refined products, as well as volatility in the price of natural gas used in our refining operations. We periodically enter into derivative contracts in the form of commodity price swaps, forward purchase and sales and futures contracts to mitigate price exposure with respect to:
	•	our inventory positions;
	•	natural gas purchases;
	•	costs of crude oil and related grade differentials;
	•	prices of refined products; and
	•	our refining margins.
	Accounting Hedges
	We have swap contracts serving as cash flow hedges against price risk on forecasted purchases of natural gas and WTI crude oil and forecasted sales of refined product. We also have forward sales contracts that lock in the prices of future sales of refined product. These contracts have been designated as accounting hedges and are measured at fair value with offsetting adjustments (gains/losses) recorded directly to other comprehensive income. These fair value adjustments are later reclassified to earnings as the hedging instruments mature. On a quarterly basis, hedge ineffectiveness is measured by comparing the change in fair value of the swap contracts against the expected future cash inflows/outflows on the respective transaction being hedged. Any hedge ineffectiveness is also recognized in earnings.
	The following table presents the pre-tax effect on other comprehensive income (“OCI”) and earnings due to fair value adjustments and maturities of commodity price swaps and forward sales under hedge accounting:
		Unrealized Gain (Loss) Recognized in OCI				Gain (Loss) Recognized in Earnings Due to Settlements						Gain (Loss) Attributable to Hedge Ineffectiveness Recognized in Earnings
						Location		Amount				Location	Amount
		(In thousands)
	Three Months Ended March 31, 2015
	Change in fair value	$	(14,148	)		Sales and other revenues		$	49,180			Sales and other revenues	$	(133	)
	Gain reclassified to earnings due to settlements	(4,692		)		Cost of products sold		(40,769		)		Cost of products sold	1,244
	Amortization of discontinued hedges reclassified to earnings	270				Operating expenses		(3,989		)		Operating expenses	547
	Total	$	(18,570	)				$	4,422				$	1,658
	Three Months Ended March 31, 2014
	Change in fair value	$	92,478			Sales and other revenues		$	(25,331	)
	Gain reclassified to earnings due to settlements	(5,760		)		Cost of products sold		29,317
	Amortization of discontinued hedges reclassified to earnings	270				Operating expenses		1,504				Operating expenses	$	(2,160	)
	Total	$	86,988					$	5,490				$	(2,160	)
	As of March 31, 2015, we have the following notional contract volumes related to outstanding derivative instruments serving as cash flow hedges against price risk on forecasted purchases of natural gas and crude oil and sales of refined products:
						Notional Contract Volumes by Year of Maturity
	Derivative Instrument		Total Outstanding Notional			2015			2016			2017		Unit of Measure
	Natural gas - long		26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	WTI crude oil - long		3,300,000			3,300,000			—			—		Barrels
	Ultra-low sulfur diesel - short		3,300,000			3,300,000			—			—		Barrels
	Forward sales		1,760,000			1,760,000			—			—		Barrels
	Forward purchases		625,000			625,000			—			—		Barrels
	In 2013, we dedesignated certain commodity price swaps (long positions) that previously received hedge accounting treatment. These contracts now serve as economic hedges against price risk on forecasted natural gas purchases totaling 26,400,000 MMBTU's to be purchased ratably through 2017. As of March 31, 2015, we have an unrealized loss of $3.0 million classified in accumulated other comprehensive income that relates to the application of hedge accounting prior to dedesignation that is amortized as a charge to operating expenses as the contracts mature.
	Economic Hedges
	We also have swap contracts that serve as economic hedges (derivatives used for risk management, but not designated as accounting hedges) to fix our purchase price on forecasted purchases of WTI crude oil, and to lock in the spread between WTI and WCS and WTS on forecasted purchases of crude oil inventory. Also, we have NYMEX futures contracts to lock in prices on forecasted purchases of inventory. These contracts are measured at fair value with offsetting adjustments (gains/losses) recorded directly to income.
	The following table presents the pre-tax effect on income due to maturities and fair value adjustments of our economic hedges:
			Three Months Ended March 31,
	Location of Gain (Loss) Recognized in Income		2015				2014
			(In thousands)
	Cost of products sold		$	22,281			$	26
	Operating expenses		(296		)		(48		)
	Total		$	21,985			$	(22	)
	As of March 31, 2015, we have the following notional contract volumes related to our outstanding derivative contracts serving as economic hedges:
					Notional Contract Volumes by Year of Maturity
	Derivative Instrument	Total Outstanding Notional			2015			2016			2017		Unit of Measure
	Commodity price swap (crude basis spread) - long	6,232,000			5,500,000			732,000			—		Barrels
	Commodity price swap (natural gas basis spread) - long	1,350,000			1,350,000			—			—		MMBTU
	Commodity price swap (natural gas) - long	26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	Commodity price swap (natural gas) - short	26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	NYMEX futures (WTI) - short	564,000			564,000			—			—		Barrels
	Interest Rate Risk Management
	HEP uses interest rate swaps to manage its exposure to interest rate risk.
	As of March 31, 2015, HEP had three interest rate swap contracts that hedge its exposure to the cash flow risk caused by the effects of LIBOR changes on $305.0 million in credit agreement advances. The first interest rate swap effectively converts $155.0 million of LIBOR based debt to fixed-rate debt having an interest rate of 0.99% plus an applicable margin of 2.00% as of March 31, 2015, which equaled an effective interest rate of 2.99%. This swap matures in February 2016. HEP has two additional interest rate swaps with identical terms which effectively convert $150.0 million of LIBOR based debt to fixed rate debt having an interest rate of 0.74% plus an applicable margin of 2.00% as of March 31, 2015, which equaled an effective interest rate of 2.74%. Both of these swap contracts mature in July 2017. All of these swap contracts have been designated as cash flow hedges. To date, there has been no ineffectiveness on these cash flow hedges.
	The following table presents the pre-tax effect on other comprehensive income and earnings due to fair value adjustments and maturities of HEP's interest rate swaps under hedge accounting:
		Unrealized Gain (Loss) Recognized in OCI				Loss Recognized in Earnings Due to Settlements
						Location		Amount
		(In thousands)
	Three Months Ended March 31, 2015
	Interest rate swaps
	Change in fair value	$	(1,280	)
	Loss reclassified to earnings due to settlements	531				Interest expense		$	(531	)
	Total	$	(749	)				$	(531	)
	Three Months Ended March 31, 2014
	Interest rate swaps
Change in fair value	$	(443	)
Loss reclassified to earnings due to settlements	538				Interest expense		$	(538	)
Total	$	95					$	(538	)
The following table presents the fair value and balance sheet locations of our outstanding derivative instruments. These amounts are presented on a gross basis with offsetting balances that reconcile to a net asset or liability position in our consolidated balance sheets. We present on a net basis to reflect the net settlement of these positions in accordance with provisions of our master netting arrangements.
		Derivatives in Net Asset Position											Derivatives in Net Liability Position
		Gross Assets				Gross Liabilities Offset in Balance Sheet				Net Assets Recognized in Balance Sheet			Gross Liabilities		Gross Assets Offset in Balance Sheet			Net Liabilities Recognized in Balance Sheet
						(In thousands)
March 31, 2015
Derivatives designated as cash flow hedging instruments:
Commodity price swap contracts		$	106,379			$	(90,773	)		$	15,606		$	61,573	$	(35,812	)	$	25,761
Forward contracts		753				(722		)		31			2,630		(1,414		)	1,216
Interest rate swap contracts		147				—				147			942		—			942
		$	107,279			$	(91,495	)		$	15,784		$	65,145	$	(37,226	)	$	27,919
Derivatives not designated as cash flow hedging instruments:
Commodity price swap contracts		$	22,090			$	(7,720	)		$	14,370		$	32,489	$	(28,347	)	$	4,142
NYMEX futures contracts		6,465				—				6,465			—		—			—
		$	28,555			$	(7,720	)		$	20,835		$	32,489	$	(28,347	)	$	4,142
Total net balance										$	36,619							$	32,061
Balance sheet classification:		Prepayment and other								$	36,472		Accrued liabilities					$	2,386
		Intangibles and other								147			Other long-term liabilities					29,675
										$	36,619							$	32,061
		Derivatives in Net Asset Position											Derivatives in Net Liability Position
		Gross Assets				Gross Liabilities Offset in Balance Sheet				Net Assets Recognized in Balance Sheet			Gross Liabilities		Gross Assets Offset in Balance Sheet			Net Liabilities Recognized in Balance Sheet
						(In thousands)
December 31, 2014
Derivatives designated as cash flow hedging instruments:
Commodity price swap contracts		$	173,658			$	(142,115	)		$	31,543		$	21,441	$	—		$	21,441
Interest rate swap contracts		1,019				—				1,019			1,065		—			1,065
		$	174,677			$	(142,115	)		$	32,562		$	22,506	$	—		$	22,506
Derivatives not designated as cash flow hedging instruments:
Commodity price swap contracts		$	17,630			$	(12,942	)		$	4,688		$	20,398	$	(17,007	)	$	3,391
NYMEX futures contracts		17,619				—				17,619			—		—			—
		$	35,249			$	(12,942	)		$	22,307		$	20,398	$	(17,007	)	$	3,391
Total net balance										$	54,869							$	25,897
Balance sheet classification:		Prepayment and other								$	53,850
		Intangibles and other								1,019			Other long-term liabilities					$	25,897
										$	54,869							$	25,897
At March 31, 2015, we had a pre-tax net unrealized loss of $7.4 million classified in accumulated other comprehensive income that relates to all accounting hedges having contractual maturities through 2017. Assuming commodity prices and interest rates remain unchanged, an unrealized gain of $20.1 million will be effectively transferred from accumulated other comprehensive income into the statement of income as the hedging instruments contractually mature over the next twelve-month period.

Equity

Equity	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Equity	Equity
	Changes to equity during the three months ended March 31, 2015 are presented below:
			HollyFrontier			Noncontrolling			Total
			Stockholders’			Interest			Equity
			Equity
			(In thousands)
	Balance at December 31, 2014		$	5,523,584		$	577,135		$	6,100,719
	Net income		226,876			15,785			242,661
	Dividends		(62,745		)	—			(62,745		)
	Distributions to noncontrolling interest holders		—			(20,472		)	(20,472		)
	Other comprehensive income, net of tax		(11,522		)	(454		)	(11,976		)
	Equity-based compensation		6,329			896			7,225
	Tax attributable to equity-based compensation		(570		)	—			(570		)
	Purchase of treasury stock (1)		(55,106		)	—			(55,106		)
	Purchase of HEP units for restricted grants		—			(247		)	(247		)
	Other		—			14			14
	Balance at March 31, 2015		$	5,626,846		$	572,657		$	6,199,503
	-1	Includes 1,215 shares withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards.
	In February 2015, our Board of Directors approved a $500 million share repurchase program authorizing us to repurchase common stock in the open market or through privately negotiated transactions. As of March 31, 2015, we had remaining authorization to repurchase up to $461.5 million under this stock repurchase program.
	On May 5, 2015, our Board of Directors approved a $1 billion share repurchase program, which replaced all existing share repurchase programs including $461.5 million remaining under the existing $500 million share repurchase program. The timing and amount of stock repurchases will depend on market conditions, corporate, regulatory and other relevant considerations. This program may be discontinued at any time by the Board of Directors. In addition, we are authorized by our Board of Directors to repurchase shares in an amount sufficient to offset shares issued under our compensation programs.

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss)
	The components and allocated tax effects of other comprehensive income (loss) are as follows:
		Before-Tax			Tax Expense			After-Tax
					(Benefit)
		(In thousands)
	Three Months Ended March 31, 2015
	Net unrealized gain on marketable securities	$	68		$	27		$	41
	Net unrealized loss on hedging instruments	(19,319		)	(7,302		)	(12,017		)
	Other comprehensive loss	(19,251		)	(7,275		)	(11,976		)
	Less other comprehensive loss attributable to noncontrolling interest	(454		)	—			(454		)
	Other comprehensive loss attributable to HollyFrontier stockholders	$	(18,797	)	$	(7,275	)	$	(11,522	)
	Three Months Ended March 31, 2014
	Net unrealized gain on marketable securities	$	11		$	(3	)	$	14
	Net unrealized gain on hedging instruments	87,083			33,743			53,340
	Net change in post-retirement benefit obligations	(89		)	(35		)	(54		)
	Other comprehensive income	87,005			33,705			53,300
	Less other comprehensive income attributable to noncontrolling interest	58			—			58
	Other comprehensive income attributable to HollyFrontier stockholders	$	86,947		$	33,705		$	53,242
	The following table presents the income statement line item effects for reclassifications out of accumulated other comprehensive income (“AOCI”):
	AOCI Component	Gain (Loss) Reclassified From AOCI						Income Statement Line Item
		(In thousands)
		Three Months Ended March 31,
		2015			2014
	Marketable securities	$	(2	)	$	1		Interest income
		42			—			Gain on sale of assets
		40			1
		15			—			Income tax expense
		25			1			Net of tax
	Hedging instruments:
	Commodity price swaps	49,180			(25,331		)	Sales and other revenues
		(40,769		)	29,317			Cost of products sold
		(3,989		)	1,504			Operating expenses
	Interest rate swaps	(531		)	(538		)	Interest expense
		3,891			4,952
		1,630			2,043			Income tax expense
		2,261			2,909			Net of tax
		322			326			Noncontrolling interest
		2,583			3,235			Net of tax and noncontrolling interest
	Total reclassifications for the period	$	2,608		$	3,236
	Accumulated other comprehensive income in the equity section of our consolidated balance sheets includes:
		March 31,			December 31,
		2015			2014
		(In thousands)
	Unrealized gain on post-retirement benefit obligations	$	20,689		$	20,689
	Unrealized loss on marketable securities	(44		)	(85		)
	Unrealized gain (loss) on hedging instruments, net of noncontrolling interest	(4,273		)	7,290
	Accumulated other comprehensive income	$	16,372		$	27,894

Postretirement_Plan

Post-retirement Plan	3 Months Ended
	Mar. 31, 2015
Pension and Other Postretirement Benefit Expense [Abstract]
Post-retirement Plans	Post-retirement Plans
	We have a post-retirement healthcare and other benefits plan that is available to certain of our employees who satisfy certain age and service requirements. The net periodic benefit credit of this plan consisted of the following components:
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Service cost – benefit earned during the period	$	424		$	224
	Interest cost on projected benefit obligations	205			159
	Amortization of prior service credit	(871		)	(1,074		)
	Amortization of net loss	46			—
	Net periodic post-retirement credit	$	(196	)	$	(691	)
	Additionally, we had a program that provided transition benefit payments to certain employees that participated in a previously terminated defined benefit plan. The program extended through 2014 and provided payments subsequent to year-end provided the employee was employed by us on the last day of each year. The payments are based on each employee's years of service and eligible salary. Transition benefit costs under this program were $0.3 million and $2.6 million for the three months ended March 31, 2015 and 2014, respectively. In March 2015, we paid all amounts owed to plan participants of $11.0 million.

Contingencies

Contingencies	3 Months Ended
	Mar. 31, 2015
Contingencies [Abstract]
Contingencies	Contingencies
	We are a party to various litigation and legal proceedings which we believe, based on advice of counsel, will not either individually or in the aggregate have a material adverse effect on our financial condition, results of operations or cash flows.
	Pursuant to the 2007 Energy Independence and Security Act, the Environmental Protection Agency (“EPA”) promulgated the Renewable Fuel Standard 2 (“RFS2”) regulations reflecting the increased volume of renewable fuels mandated to be blended into the nation's fuel supply. The regulations, in part, require refiners to add annually increasing amounts of “renewable fuels” to their petroleum products or purchase credits, known as renewable identification numbers (“RINs”), in lieu of such blending. The EPA has not yet finalized the 2014 nor the 2015 percentage standards under its RFS2 program. The estimated quantity of renewable fuels or RINs that we are required to purchase and that have been accrued for as of March 31, 2015 and December 31, 2014, as well as for the three months and year then ended, are based on quantities proposed by the EPA in November 2013.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Information [Abstract]
Segment Information	Segment Information
	Our operations are organized into two reportable segments, Refining and HEP. Our operations that are not included in the Refining and HEP segments are included in Corporate and Other. Intersegment transactions are eliminated in our consolidated financial statements and are included in Consolidations and Eliminations.
	The Refining segment represents the operations of the El Dorado, Tulsa, Navajo, Cheyenne and Woods Cross Refineries and NK Asphalt (aggregated as a reportable segment). Refining activities involve the purchase and refining of crude oil and wholesale and branded marketing of refined products, such as gasoline, diesel fuel and jet fuel. These petroleum products are primarily marketed in the Mid-Continent, Southwest and Rocky Mountain regions of the United States. Additionally, the Refining segment includes specialty lubricant products produced at our Tulsa Refineries that are marketed throughout North America and are distributed in Central and South America. NK Asphalt operates various asphalt terminals in Arizona, New Mexico and Oklahoma.
	The HEP segment includes all of the operations of HEP, which owns and operates logistics assets consisting of petroleum product and crude oil pipelines and terminal, tankage and loading rack facilities in the Mid-Continent, Southwest and Rocky Mountain regions of the United States. The HEP segment also includes a 75% interest in UNEV (a consolidated subsidiary of HEP) and a 25% interest in the SLC Pipeline. Revenues from the HEP segment are earned through transactions with unaffiliated parties for pipeline transportation, rental and terminalling operations as well as revenues relating to pipeline transportation services provided for our refining operations. Due to certain basis differences, our reported amounts for the HEP segment may not agree to amounts reported in HEP’s periodic public filings.
	The accounting policies for our segments are the same as those described in the summary of significant accounting policies in our Annual Report on Form 10-K for the year ended December 31, 2014.
		Refining		HEP		Corporate			Consolidations			Consolidated
						and Other			and Eliminations			Total
		(In thousands)
	Three Months Ended March 31, 2015
	Sales and other revenues	$	2,989,280	$	89,756	$	218		$	(72,628	)	$	3,006,626
	Depreciation and amortization	$	63,275	$	14,290	$	2,654		$	(207	)	$	80,012
	Income (loss) from operations	$	373,901	$	44,210	$	(28,949	)	$	(540	)	$	388,622
	Capital expenditures	$	129,761	$	38,433	$	4,425		$	—		$	172,619
	Three Months Ended March 31, 2014
	Sales and other revenues	$	4,775,080	$	87,012	$	1,115		$	(72,154	)	$	4,791,053
	Depreciation and amortization	$	63,541	$	15,184	$	2,030		$	(207	)	$	80,548
	Income (loss) from operations	$	251,209	$	45,865	$	(25,555	)	$	(523	)	$	270,996
	Capital expenditures	$	99,943	$	20,604	$	3,734		$	—		$	124,281
	March 31, 2015
	Cash, cash equivalents and total investments in marketable securities	$	196	$	5,802	$	1,002,601		$	—		$	1,008,599
	Total assets	$	7,015,682	$	1,458,019	$	1,106,374		$	(317,948	)	$	9,262,127
	Long-term debt	$	—	$	890,742	$	186,627		$	—		$	1,077,369
	December 31, 2014
	Cash, cash equivalents and total investments in marketable securities	$	88	$	2,830	$	1,039,177		$	—		$	1,042,095
	Total assets	$	6,965,245	$	1,434,572	$	1,150,865		$	(320,042	)	$	9,230,640
	Long-term debt	$	—	$	867,579	$	187,311		$	—		$	1,054,890
	HEP segment revenues from external customers were $17.5 million and $15.2 million for the three months ended March 31, 2015 and 2014, respectively.

Supplemental_GuarantorNonGuara

Supplemental Guarantor/Non-Guarantor Financial Information	3 Months Ended
	Mar. 31, 2015
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Supplemental Guarantor/Non-Guarantor Financial Information	Supplemental Guarantor/Non-Guarantor Financial Information
	Our obligations under the HollyFrontier Senior Notes have been jointly and severally guaranteed by the substantial majority of our existing and future restricted subsidiaries (“Guarantor Restricted Subsidiaries”). These guarantees are full and unconditional. HEP, in which we have a 39% ownership interest at March 31, 2015, and its subsidiaries (collectively, “Non-Guarantor Non-Restricted Subsidiaries”), and certain of our other subsidiaries (“Non-Guarantor Restricted Subsidiaries”) have not guaranteed these obligations.
	The following condensed consolidating financial information is provided for HollyFrontier Corporation (the “Parent”), the Guarantor Restricted Subsidiaries, the Non-Guarantor Restricted Subsidiaries and the Non-Guarantor Non-Restricted Subsidiaries. The information has been presented as if the Parent accounted for its ownership in the Guarantor Restricted Subsidiaries, and the Guarantor Restricted Subsidiaries accounted for the ownership of the Non-Guarantor Restricted Subsidiaries and Non-Guarantor Non-Restricted Subsidiaries, using the equity method of accounting. The Guarantor Restricted Subsidiaries and the Non-Guarantor Restricted Subsidiaries are collectively the “Restricted Subsidiaries.”
	Condensed Consolidating Balance Sheet
	March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	588,246		$	—		$	44		$	—		$	588,290		$	5,802		$	—		$	594,092
	Marketable securities	414,507			—			—			—			414,507			—			—			414,507
	Accounts receivable, net	9,538			518,569			11,299			—			539,406			39,855			(52,408		)	526,853
	Intercompany accounts receivable	—			300,829			421,108			(721,937		)	—			—			—			—
	Inventories	—			1,113,717			—			—			1,113,717			1,961			—			1,115,678
	Prepayments and other	13,308			53,708			—			—			67,016			2,428			(4,796		)	64,648
	Total current assets	1,025,599			1,986,823			432,451			(721,937		)	2,722,936			50,046			(57,204		)	2,715,778
	Properties, plants and equip, net	32,610			2,956,913			950			—			2,990,473			1,046,987			(256,300		)	3,781,160
	Investment in subsidiaries	6,280,300			323,760			—			(6,604,060		)	—			—			—			—
	Intangibles and other assets	30,178			2,378,469			25,000			(25,000		)	2,408,647			360,986			(4,444		)	2,765,189
	Total assets	$	7,368,687		$	7,645,965		$	458,401		$	(7,350,997	)	$	8,122,056		$	1,458,019		$	(317,948	)	$	9,262,127
	LIABILITIES AND EQUITY
	Current liabilities:
	Accounts payable	$	2,852		$	951,974		$	—		$	—		$	954,826		$	28,491		$	(52,408	)	$	930,909
	Intercompany accounts payable	721,937			—			—			(721,937		)	—			—			—			—
	Income tax payable	112,016			—			—			—			112,016			—			—			112,016
	Accrued liabilities	39,545			59,500			1,955			—			101,000			16,771			(4,796		)	112,975
	Deferred income tax liabilities	16,503			—			—			—			16,503			—			—			16,503
	Total current liabilities	892,853			1,011,474			1,955			(721,937		)	1,184,345			45,262			(57,204		)	1,172,403
	Long-term debt	178,908			32,719			—			(25,000		)	186,627			890,742			—			1,077,369
	Liability to HEP	—			230,374			—			—			230,374			—			(230,374		)	—
	Deferred income tax liabilities	630,610			—			—			—			630,610			420			—			631,030
	Other long-term liabilities	43,994			91,098			—			—			135,092			52,322			(5,592		)	181,822
	Investment in HEP	—			—			132,686			—			132,686			—			(132,686		)	—
	Equity – HollyFrontier	5,622,322			6,280,300			323,760			(6,604,060		)	5,622,322			373,154			(368,630		)	5,626,846
	Equity – noncontrolling interest	—			—			—			—			—			96,119			476,538			572,657
	Total liabilities and equity	$	7,368,687		$	7,645,965		$	458,401		$	(7,350,997	)	$	8,122,056		$	1,458,019		$	(317,948	)	$	9,262,127
	Condensed Consolidating Balance Sheet
	December 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	565,080		$	—		$	75		$	—		$	565,155		$	2,830		$	—		$	567,985
	Marketable securities	474,068			42			—			—			474,110			—			—			474,110
	Accounts receivable, net	5,107			579,526			3,774			—			588,407			40,129			(38,631		)	589,905
	Intercompany accounts receivable	—			171,341			397,540			(568,881		)	—			—			—			—
	Inventories	—			1,033,191			—			—			1,033,191			1,940			—			1,035,131
	Income taxes receivable	11,719			—			—			—			11,719			—			—			11,719
	Prepayments and other	14,734			95,194			—			—			109,928			2,443			(8,223		)	104,148
	Total current assets	1,070,708			1,879,294			401,389			(568,881		)	2,782,510			47,342			(46,854		)	2,782,998
	Properties, plants and equip, net	31,808			2,873,350			902			—			2,906,060			1,024,311			(259,832		)	3,670,539
	Investment in subsidiaries	5,912,233			291,912			—			(6,204,145		)	—			—			—			—
	Intangibles and other assets	30,082			2,388,844			25,000			(25,000		)	2,418,926			362,919			(4,742		)	2,777,103
	Total assets	$	7,044,831		$	7,433,400		$	427,291		$	(6,798,026	)	$	8,107,496		$	1,434,572		$	(311,428	)	$	9,230,640
	LIABILITIES AND EQUITY
	Current liabilities:
	Accounts payable	$	11,457		$	1,117,429		$	2		$	—		$	1,128,888		$	17,881		$	(38,631	)	$	1,108,138
	Intercompany accounts payable	568,881			—			—			(568,881		)	—			—			—			—
	Income taxes payable	19,642			—			—			—			19,642			—			—			19,642
	Accrued liabilities	41,403			45,331			1,382			—			88,116			26,321			(8,223		)	106,214
Deferred income tax liabilities	17,409			—			—			—			17,409			—			—			17,409
Total current liabilities	658,792			1,162,760			1,384			(568,881		)	1,254,055			44,202			(46,854		)	1,251,403
Long-term debt	179,144			33,167			—			(25,000		)	187,311			867,579			—			1,054,890
Liability to HEP	—			233,217			—			—			233,217			—			(233,217		)	—
Deferred income tax liabilities	646,503			—			—			—			646,503			367			—			646,870
Other long-term liabilities	43,451			92,023			—			—			135,474			47,170			(5,886		)	176,758
Investment in HEP	—			—			133,995			—			133,995			—			(133,995		)	—
Equity – HollyFrontier	5,516,941			5,912,233			291,912			(6,204,145		)	5,516,941			380,172			(373,529		)	5,523,584
Equity – noncontrolling interest	—			—			—			—			—			95,082			482,053			577,135
Total liabilities and equity	$	7,044,831		$	7,433,400		$	427,291		$	(6,798,026	)	$	8,107,496		$	1,434,572		$	(311,428	)	$	9,230,640
Condensed Consolidating Statement of Income and Comprehensive Income
Three Months Ended March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
				Restricted			Guarantor						Corp. Before			Non-Restricted
				Subsidiaries			Restricted						Consolidation			Subsidiaries
							Subsidiaries						of HEP			(HEP Segment)
	(In thousands)
Sales and other revenues	$	106		$	2,989,392		$	—		$	—		$	2,989,498		$	89,756		$	(72,628	)	$	3,006,626
Operating costs and expenses:
Cost of products sold	—			2,322,881			—			—			2,322,881			—			(71,508		)	2,251,373
Lower of cost or market inventory valuation adjustment	—			(6,546		)	—			—			(6,546		)	—			—			(6,546		)
Operating expenses	—			236,003			—			—			236,003			27,966			(373		)	263,596
General and administrative	25,824			415			40			—			26,279			3,290			—			29,569
Depreciation and amortization	2,326			66,924			8			—			69,258			14,290			(3,536		)	80,012
Total operating costs and expenses	28,150			2,619,677			48			—			2,647,875			45,546			(75,417		)	2,618,004
Income (loss) from operations	(28,044		)	369,715			(48		)	—			341,623			44,210			2,789			388,622
Other income (expense):
Earnings (loss) of equity method investments	384,401			12,035			20,442			(404,977		)	11,901			734			(20,442		)	(7,807		)
Interest income (expense)	(302		)	2,049			175			—			1,922			(8,767		)	(2,347		)	(9,192		)
Gain on sale of assets	6			602			—			—			608			158			—			766
	384,105			14,686			20,617			(404,977		)	14,431			(7,875		)	(22,789		)	(16,233		)
Income before income taxes	356,061			384,401			20,569			(404,977		)	356,054			36,335			(20,000		)	372,389
Income tax provision	129,627			—			—			—			129,627			101			—			129,728
Net income	226,434			384,401			20,569			(404,977		)	226,427			36,234			(20,000		)	242,661
Less net income attributable to noncontrolling interest	—			—			(7		)	—			(7		)	4,027			11,765			15,785
Net income attributable to HollyFrontier stockholders	$	226,434		$	384,401		$	20,576		$	(404,977	)	$	226,434		$	32,207		$	(31,765	)	$	226,876
Comprehensive income attributable to HollyFrontier stockholders	$	214,912		$	365,536		$	20,281		$	(385,817	)	$	214,912		$	31,912		$	(31,470	)	$	215,354
Condensed Consolidating Statement of Income and Comprehensive Income
Three Months Ended March 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
				Restricted			Guarantor						Corp. Before			Non-Restricted
				Subsidiaries			Restricted						Consolidation			Subsidiaries
							Subsidiaries						of HEP			(HEP Segment)
	(In thousands)
Sales and other revenues	$	101		$	4,775,123		$	971		$	—		$	4,776,195		$	87,012		$	(72,154	)	$	4,791,053
Operating costs and expenses:
Cost of products sold	—			4,209,722			—			—			4,209,722			—			(71,102		)	4,138,620
Operating expenses	—			251,476			—			—			251,476			22,812			(322		)	273,966
General and administrative	21,107			2,626			39			—			23,772			3,151			—			26,923
Depreciation and amortization	1,790			67,107			—			—			68,897			15,184			(3,533		)	80,548
Total operating costs and expenses	22,897			4,530,931			39			—			4,553,867			41,147			(74,957		)	4,520,057
Income (loss) from operations	(22,796		)	244,192			932			—			222,328			45,865			2,803			270,996
Other income (expense):
Earnings (loss) of equity method investments	262,359			16,022			16,283			(279,704		)	14,960			522			(16,283		)	(801		)
Interest income (expense)	(424		)	2,145			130			—			1,851			(10,451		)	(2,342		)	(10,942		)
Loss on early extinguishment of debt	—			—			—			—			—			(7,677		)	—			(7,677		)
	261,935			18,167			16,413			(279,704		)	16,811			(17,606		)	(18,625		)	(19,420		)
Income before income taxes	239,139			262,359			17,345			(279,704		)	239,139			28,259			(15,822		)	251,576
Income tax provision	87,539			—			—			—			87,539			75			—			87,614
Net income	151,600			262,359			17,345			(279,704		)	151,600			28,184			(15,822		)	163,962
Less net income attributable to noncontrolling interest	—			—			—			—			—			3,637			8,264			11,901
Net income attributable to HollyFrontier stockholders	$	151,600		$	262,359		$	17,345		$	(279,704	)	$	151,600		$	24,547		$	(24,086	)	$	152,061
Comprehensive income attributable to HollyFrontier stockholders	$	204,842		$	349,384		$	17,382		$	(366,766	)	$	204,842		$	24,585		$	(24,124	)	$	205,303
Condensed Consolidating Statement of Cash Flows
Three Months Ended March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
				Restricted			Guarantor						Corp. Before			Non-Restricted
				Subsidiaries			Restricted						Consolidation			Subsidiaries
							Subsidiaries						of HEP			(HEP Segment)
	(In thousands)
Cash flows from operating activities	$	(68,504	)	$	258,441		$	17,831		$	—		$	207,768		$	60,767		$	(21,643	)	$	246,892
Cash flows from investing activities
Additions to properties, plants and equipment	(3,124		)	(131,006		)	(56		)	—			(134,186		)	—			—			(134,186		)
Additions to properties, plants and equipment – HEP	—			—			—			—			—			(38,433		)	—			(38,433		)
Other, net	—			814			—			—			814			—			—			814
Purchases of marketable securities	(118,816		)	—			—			—			(118,816		)	—			—			(118,816		)
Sales and maturities of marketable securities	178,524			—			—			—			178,524			—			—			178,524
Net advances to Parent	—			(135,235		)	(17,821		)	153,056			—			—			—			—
	56,584			(265,427		)	(17,877		)	153,056			(73,664		)	(38,433		)	—			(112,097		)
Cash flows from financing activities
Net borrowings under credit agreement – HEP	—			—			—			—			—			23,000			—			23,000
Inventory repurchase obligation	—			7,434			—			—			7,434			—			—			7,434
Purchase of treasury stock	(55,065		)	—			—			—			(55,065		)	—			—			(55,065		)
Dividends	(62,335		)	—			—			—			(62,335		)	—			—			(62,335		)
Distributions to noncontrolling interest	—			—			—			—			—			(42,115		)	21,643			(20,472		)
Other, net	(570		)	(448		)	15			—			(1,003		)	(247		)	—			(1,250		)
Net advances from subsidiaries	153,056			—			—			(153,056		)	—			—			—			—
	35,086			6,986			15			(153,056		)	(110,969		)	(19,362		)	21,643			(108,688		)
Cash and cash equivalents
Increase (decrease) for the period	23,166			—			(31		)	—			23,135			2,972			—			26,107
Beginning of period	565,080			—			75			—			565,155			2,830			—			567,985
End of period	$	588,246		$	—		$	44		$	—		$	588,290		$	5,802		$	—		$	594,092
Condensed Consolidating Statement of Cash Flows
Three Months Ended March 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
				Restricted			Guarantor						Corp. Before			Non-Restricted
				Subsidiaries			Restricted						Consolidation			Subsidiaries
							Subsidiaries						of HEP			(HEP Segment)
	(In thousands)
Cash flows from operating activities	$	(23,564	)	$	381,180		$	17,477		$	—		$	375,093		$	39,047		$	(19,211	)	$	394,929
Cash flows from investing activities:
Additions to properties, plants and equipment	(3,163		)	(100,483		)	(31		)	—			(103,677		)	—			—			(103,677		)
Additions to properties, plants and equipment – HEP	—			—			—			—			—			(20,604		)	—			(20,604		)
Purchases of marketable securities	(244,030		)	—			—			—			(244,030		)	—			—			(244,030		)
Sales and maturities of marketable securities	253,676			—			—			—			253,676			—			—			253,676
Other, net	—			1,586			—			—			1,586			—			—			1,586
Net advances to Parent	—			(302,773		)	(17,412		)	320,185			—			—			—			—
	6,483			(401,670		)	(17,443		)	320,185			(92,445		)	(20,604		)	—			(113,049		)
Cash flows from financing activities:
Net borrowings under credit agreement – HEP	—			—			—			—			—			174,700			—			174,700
Redemption of senior notes	—			—			—			—			—			(156,188		)	—			(156,188		)
Inventory repurchase obligation				21,126									21,126			—			—			21,126
Purchase of treasury stock	(13,988		)	—			—			—			(13,988		)	—			—			(13,988		)
Dividends	(158,614		)	—			—			—			(158,614		)	—			—			(158,614		)
Distributions to noncontrolling interest	—			—			—			—			—			(38,092		)	19,211			(18,881		)
Excess tax benefit from equity-based compensation	5,156			—			—			—			5,156			—			—			5,156
Other, net	—			(398		)	75			—			(323		)	(336		)	—			(659		)
Net advances from subsidiaries	320,185			—			—			(320,185		)	—			—			—			—
	152,739			20,728			75			(320,185		)	(146,643		)	(19,916		)	19,211			(147,348		)
Cash and cash equivalents
Increase (decrease) for the period:	135,658			238			109			—			136,005			(1,473		)	—			134,532
Beginning of period	931,920			1,817			14			—			933,751			6,352			—			940,103
End of period	$	1,067,578		$	2,055		$	123		$	—		$	1,069,756		$	4,879		$	—		$	1,074,635

Description_of_Business_and_Pr1

Description of Business and Presentation of Financial Statements (Policy)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts Receivable	Accounts Receivable: Our accounts receivable consist of amounts due from customers that are primarily companies in the petroleum industry. Credit is extended based on our evaluation of the customer’s financial condition, and in certain circumstances collateral, such as letters of credit or guarantees, is required. We reserve for doubtful accounts based on our historical loss experience as well as specific accounts identified as high risk, which historically have been minimal. Credit losses are charged to the allowance for doubtful accounts when an account is deemed uncollectible. Our allowance for doubtful accounts was $2.4 million at March 31, 2015 and December 31, 2014.
Inventories	Inventories: Inventories are stated at the lower of cost, using the last-in, first-out (“LIFO”) method for crude oil, unfinished and finished refined products and the average cost method for materials and supplies, or market. In periods of rapidly declining prices, LIFO inventories may have to be written down to market value due to the higher costs assigned to LIFO layers in prior periods. In addition, the use of the LIFO inventory method may result in increases or decreases to cost of sales in years that inventory volumes decline as the result of charging cost of sales with LIFO inventory costs generated in prior periods. An actual valuation of inventory under the LIFO method is made at the end of each year based on the inventory levels at that time. Accordingly, interim LIFO calculations are based on management's estimates of expected year-end inventory levels and are subject to the final year-end LIFO inventory valuation.
Goodwill	Goodwill: We have goodwill that primarily arose from our merger with Frontier Oil Corporation on July 1, 2011. Goodwill represents the excess of the cost of an acquired entity over the fair value of the assets acquired and liabilities assumed. Goodwill is not subject to amortization and is tested annually or more frequently if events or circumstances indicate the possibility of impairment. As of March 31, 2015, there have been no impairments to goodwill.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements
	Revenue Recognition
	In May 2014, an accounting standard update (ASU 2014-09, “Revenue from Contracts with Customers”) was issued requiring revenue to be recognized when promised goods or services are transferred to customers in an amount that reflects the expected consideration for these goods or services. This standard has a proposed effective date of January 1, 2018, and we are evaluating the impact of this standard.

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Financial Instruments, Owned, at Fair Value [Abstract]
Estimated Fair Values Of Debt Instruments	The carrying amounts and estimated fair values of our investments in marketable securities, derivative instruments and senior notes at March 31, 2015 and December 31, 2014 were as follows:
								Fair Value by Input Level
	Financial Instrument	Carrying Amount			Fair Value			Level 1		Level 2		Level 3
		(In thousands)
	March 31, 2015
	Assets:
	Marketable securities	$	414,507		$	414,507		$	—	$	414,507	$	—
	NYMEX futures contracts	6,465			6,465			6,465		—		—
	Commodity price swaps	192,628			192,628			—		192,628		—
	Forward contracts	2,167			2,167			—		1,566		601
	HEP interest rate swaps	147			147			—		147		—
	Total assets	$	615,914		$	615,914		$	6,465	$	608,848	$	601
	Liabilities:
	Commodity price swaps	$	192,555		$	192,555		$	—	$	192,555	$	—
	Forward contracts	3,352			3,352			—		199		3,153
	HollyFrontier senior notes	153,908			154,500			—		154,500		—
	HEP senior notes	296,742			295,500			—		295,500		—
	HEP interest rate swaps	942			942			—		942		—
	Total liabilities	$	647,499		$	646,849		$	—	$	643,696	$	3,153
								Fair Value by Input Level
	Financial Instrument	Carrying Amount			Fair Value			Level 1		Level 2		Level 3
		(In thousands)
	December 31, 2014
	Assets:
	Marketable securities	$	474,110		$	474,110		$	—	$	474,110	$	—
	NYMEX futures contracts	17,619			17,619			17,619		—		—
	Commodity price swaps	208,296			208,296			—		208,296		—
	HEP interest rate swaps	1,019			1,019			—		1,019		—
	Total assets	$	701,044		$	701,044		$	17,619	$	683,425	$	—
	Liabilities:
	Commodity price swaps	$	196,897		$	196,897		$	—	$	196,897	$	—
	HollyFrontier senior notes	154,144			155,250			—		155,250		—
	HEP senior notes	296,579			291,000			—		291,000		—
	HEP interest rate swaps	1,065			1,065			—		1,065		—
	Total liabilities	$	648,685		$	644,212		$	—	$	644,212	$	—
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents the changes in fair value of our Level 3 assets and liabilities (all related to derivative instruments) for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
	Level 3 Financial Instruments	2015			2014
		(In thousands)
	Liability balance at beginning of period	$	—		$	(35,318	)
	Change in fair value:
	Recognized in other comprehensive income	(2,552		)	(22,137		)
	Recognized in cost of products sold	—			8,970
	Settlement date fair value of contractual maturities:
	Recognized in sales and other revenues	—			25,331
	Recognized in cost of products sold	—			681
	Liability balance at end of period	$	(2,552	)	$	(22,473	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share	The following is a reconciliation of the components of the basic and diluted per share computations for net income attributable to HollyFrontier stockholders:
		Three Months Ended March 31,
		2015		2014
		(In thousands, except per share data)
	Net income attributable to HollyFrontier stockholders	$	226,876	$	152,061
	Participating securities' share in earnings	644		466
	Net income attributable to common shares	$	226,232	$	151,595
	Average number of shares of common stock outstanding	195,069		198,297
	Effect of dilutive variable restricted shares and performance share units (1)	52		627
	Average number of shares of common stock outstanding assuming dilution	195,121		198,924
	Basic earnings per share	$	1.16	$	0.76
	Diluted earnings per share	$	1.16	$	0.76
	(1) Excludes anti-dilutive restricted and performance share units of:	412		14

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Summary Of Restricted Stock Activity	A summary of restricted stock and restricted stock unit activity and changes during the three months ended March 31, 2015 is presented below:
	Restricted Stock and Restricted Stock Units	Grants		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value ($000)
	Outstanding at January 1, 2015 (non-vested)	669,777		$	40.49
	Granted	8,132		36.59
	Vesting (transfer/conversion to common stock)	(2,999	)	44.48
	Forfeited	(6,046	)	43.78
	Outstanding at March 31, 2015 (non-vested)	668,864		$	44.03	$	26,935
Summary Of Performance Share Unit Activity	A summary of performance share unit activity and changes during the three months ended March 31, 2015 is presented below:
	Performance Share Units	Grants
	Outstanding at January 1, 2015 (non-vested)	725,054
	Granted	3,654
	Forfeited	(11,774	)
	Outstanding at March 31, 2015 (non-vested)	716,934

Cash_and_Cash_Equivalents_and_1

Cash and Cash Equivalents and Investments in Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Cash And Cash Equivalents And Investments In Marketable Securities [Abstract]
Available-For-Sale Securities	The following is a summary of our marketable securities:
		Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
									(Net Carrying Amount)
		(In thousands)
	March 31, 2015
	Certificates of deposit	$	27,000	$	4	$	—		$	27,004
	Commercial paper	46,375		16		(3		)	46,388
	Corporate debt securities	112,175		12		(47		)	112,140
	State and political subdivisions debt securities	229,039		11		(75		)	228,975
	Total marketable securities	$	414,589	$	43	$	(125	)	$	414,507
	December 31, 2014
	Certificates of deposit	$	54,000	$	10	$	—		$	54,010
	Commercial paper	52,297		7		(4		)	52,300
	Corporate debt securities	136,181		1		(94		)	136,088
	State and political subdivisions debt securities	231,819		5		(112		)	231,712
	Total marketable securities	$	474,297	$	23	$	(210	)	$	474,110

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Inventory Components	Inventory consists of the following components:
			March 31,			December 31, 2014
			2015
			(In thousands)
	Crude oil		$	575,714		$	581,592
	Other raw materials and unfinished products(1)		199,608			204,467
	Finished products(2)		614,546			531,523
	Lower of cost or market reserve		(390,932		)	(397,478		)
	Process chemicals(3)		4,563			4,028
	Repair and maintenance supplies and other		112,179			110,999
	Total inventory		$	1,115,678		$	1,035,131
	-1	Other raw materials and unfinished products include feedstocks and blendstocks, other than crude.
	-2	Finished products include gasolines, jet fuels, diesels, lubricants, asphalts, LPG’s and residual fuels.
	-3	Process chemicals include additives and other chemicals.

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt [Abstract]
Carrying Amounts Of Long-Term Debt	The carrying amounts of long-term debt are as follows:
		March 31,			December 31,
		2015			2014
		(In thousands)
	6.875% Senior Notes
	Principal	$	150,000		$	150,000
	Unamortized premium	3,908			4,144
		153,908			154,144
	Financing Obligation	32,719			33,167
	Total HollyFrontier long-term debt	186,627			187,311
	HEP Credit Agreement	594,000			571,000
	HEP 6.5% Senior Notes
	Principal	300,000			300,000
	Unamortized discount	(3,258		)	(3,421		)
		296,742			296,579
	Total HEP long-term debt	890,742			867,579
	Total long-term debt	$	1,077,369		$	1,054,890

Derivative_Instruments_And_Hed1

Derivative Instruments And Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The following table presents the pre-tax effect on other comprehensive income (“OCI”) and earnings due to fair value adjustments and maturities of commodity price swaps and forward sales under hedge accounting:
		Unrealized Gain (Loss) Recognized in OCI				Gain (Loss) Recognized in Earnings Due to Settlements						Gain (Loss) Attributable to Hedge Ineffectiveness Recognized in Earnings
						Location		Amount				Location	Amount
		(In thousands)
	Three Months Ended March 31, 2015
	Change in fair value	$	(14,148	)		Sales and other revenues		$	49,180			Sales and other revenues	$	(133	)
	Gain reclassified to earnings due to settlements	(4,692		)		Cost of products sold		(40,769		)		Cost of products sold	1,244
	Amortization of discontinued hedges reclassified to earnings	270				Operating expenses		(3,989		)		Operating expenses	547
	Total	$	(18,570	)				$	4,422				$	1,658
	Three Months Ended March 31, 2014
	Change in fair value	$	92,478			Sales and other revenues		$	(25,331	)
	Gain reclassified to earnings due to settlements	(5,760		)		Cost of products sold		29,317
	Amortization of discontinued hedges reclassified to earnings	270				Operating expenses		1,504				Operating expenses	$	(2,160	)
	Total	$	86,988					$	5,490				$	(2,160	)
Schedule of Notional Amounts of Outstanding Derivatives Serving as Cash Flow Hedges	As of March 31, 2015, we have the following notional contract volumes related to outstanding derivative instruments serving as cash flow hedges against price risk on forecasted purchases of natural gas and crude oil and sales of refined products:
						Notional Contract Volumes by Year of Maturity
	Derivative Instrument		Total Outstanding Notional			2015			2016			2017		Unit of Measure
	Natural gas - long		26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	WTI crude oil - long		3,300,000			3,300,000			—			—		Barrels
	Ultra-low sulfur diesel - short		3,300,000			3,300,000			—			—		Barrels
	Forward sales		1,760,000			1,760,000			—			—		Barrels
	Forward purchases		625,000			625,000			—			—		Barrels
Schedule of Realized Gain (Loss)	The following table presents the pre-tax effect on income due to maturities and fair value adjustments of our economic hedges:
			Three Months Ended March 31,
	Location of Gain (Loss) Recognized in Income		2015				2014
			(In thousands)
	Cost of products sold		$	22,281			$	26
	Operating expenses		(296		)		(48		)
	Total		$	21,985			$	(22	)
Schedule of Notional Amounts of Outstanding Derivative Positions	As of March 31, 2015, we have the following notional contract volumes related to our outstanding derivative contracts serving as economic hedges:
					Notional Contract Volumes by Year of Maturity
	Derivative Instrument	Total Outstanding Notional			2015			2016			2017		Unit of Measure
	Commodity price swap (crude basis spread) - long	6,232,000			5,500,000			732,000			—		Barrels
	Commodity price swap (natural gas basis spread) - long	1,350,000			1,350,000			—			—		MMBTU
	Commodity price swap (natural gas) - long	26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	Commodity price swap (natural gas) - short	26,400,000			7,200,000			9,600,000			9,600,000		MMBTU
	NYMEX futures (WTI) - short	564,000			564,000			—			—		Barrels
Schedule of Interest Rate Derivatives	The following table presents the pre-tax effect on other comprehensive income and earnings due to fair value adjustments and maturities of HEP's interest rate swaps under hedge accounting:
		Unrealized Gain (Loss) Recognized in OCI				Loss Recognized in Earnings Due to Settlements
						Location		Amount
		(In thousands)
	Three Months Ended March 31, 2015
	Interest rate swaps
	Change in fair value	$	(1,280	)
	Loss reclassified to earnings due to settlements	531				Interest expense		$	(531	)
	Total	$	(749	)				$	(531	)
	Three Months Ended March 31, 2014
	Interest rate swaps
	Change in fair value	$	(443	)
	Loss reclassified to earnings due to settlements	538				Interest expense		$	(538	)
	Total	$	95					$	(538	)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value and balance sheet locations of our outstanding derivative instruments. These amounts are presented on a gross basis with offsetting balances that reconcile to a net asset or liability position in our consolidated balance sheets. We present on a net basis to reflect the net settlement of these positions in accordance with provisions of our master netting arrangements.
			Derivatives in Net Asset Position											Derivatives in Net Liability Position
			Gross Assets				Gross Liabilities Offset in Balance Sheet				Net Assets Recognized in Balance Sheet			Gross Liabilities		Gross Assets Offset in Balance Sheet			Net Liabilities Recognized in Balance Sheet
							(In thousands)
	March 31, 2015
	Derivatives designated as cash flow hedging instruments:
	Commodity price swap contracts		$	106,379			$	(90,773	)		$	15,606		$	61,573	$	(35,812	)	$	25,761
	Forward contracts		753				(722		)		31			2,630		(1,414		)	1,216
	Interest rate swap contracts		147				—				147			942		—			942
			$	107,279			$	(91,495	)		$	15,784		$	65,145	$	(37,226	)	$	27,919
	Derivatives not designated as cash flow hedging instruments:
	Commodity price swap contracts		$	22,090			$	(7,720	)		$	14,370		$	32,489	$	(28,347	)	$	4,142
	NYMEX futures contracts		6,465				—				6,465			—		—			—
			$	28,555			$	(7,720	)		$	20,835		$	32,489	$	(28,347	)	$	4,142
	Total net balance										$	36,619							$	32,061
	Balance sheet classification:		Prepayment and other								$	36,472		Accrued liabilities					$	2,386
			Intangibles and other								147			Other long-term liabilities					29,675
											$	36,619							$	32,061
			Derivatives in Net Asset Position											Derivatives in Net Liability Position
			Gross Assets				Gross Liabilities Offset in Balance Sheet				Net Assets Recognized in Balance Sheet			Gross Liabilities		Gross Assets Offset in Balance Sheet			Net Liabilities Recognized in Balance Sheet
							(In thousands)
	December 31, 2014
	Derivatives designated as cash flow hedging instruments:
	Commodity price swap contracts		$	173,658			$	(142,115	)		$	31,543		$	21,441	$	—		$	21,441
	Interest rate swap contracts		1,019				—				1,019			1,065		—			1,065
			$	174,677			$	(142,115	)		$	32,562		$	22,506	$	—		$	22,506
	Derivatives not designated as cash flow hedging instruments:
	Commodity price swap contracts		$	17,630			$	(12,942	)		$	4,688		$	20,398	$	(17,007	)	$	3,391
	NYMEX futures contracts		17,619				—				17,619			—		—			—
			$	35,249			$	(12,942	)		$	22,307		$	20,398	$	(17,007	)	$	3,391
	Total net balance										$	54,869							$	25,897
	Balance sheet classification:		Prepayment and other								$	53,850
			Intangibles and other								1,019			Other long-term liabilities					$	25,897
											$	54,869							$	25,897

Equity_Tables

Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Changes To Equity	Changes to equity during the three months ended March 31, 2015 are presented below:
			HollyFrontier			Noncontrolling			Total
			Stockholders’			Interest			Equity
			Equity
			(In thousands)
	Balance at December 31, 2014		$	5,523,584		$	577,135		$	6,100,719
	Net income		226,876			15,785			242,661
	Dividends		(62,745		)	—			(62,745		)
	Distributions to noncontrolling interest holders		—			(20,472		)	(20,472		)
	Other comprehensive income, net of tax		(11,522		)	(454		)	(11,976		)
	Equity-based compensation		6,329			896			7,225
	Tax attributable to equity-based compensation		(570		)	—			(570		)
	Purchase of treasury stock (1)		(55,106		)	—			(55,106		)
	Purchase of HEP units for restricted grants		—			(247		)	(247		)
	Other		—			14			14
	Balance at March 31, 2015		$	5,626,846		$	572,657		$	6,199,503
	-1	Includes 1,215 shares withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards.

Other_Comprehensive_Income_Los1

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Other Comprehensive Income (Loss) [Abstract]
Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)	The components and allocated tax effects of other comprehensive income (loss) are as follows:
		Before-Tax			Tax Expense			After-Tax
					(Benefit)
		(In thousands)
	Three Months Ended March 31, 2015
	Net unrealized gain on marketable securities	$	68		$	27		$	41
	Net unrealized loss on hedging instruments	(19,319		)	(7,302		)	(12,017		)
	Other comprehensive loss	(19,251		)	(7,275		)	(11,976		)
	Less other comprehensive loss attributable to noncontrolling interest	(454		)	—			(454		)
	Other comprehensive loss attributable to HollyFrontier stockholders	$	(18,797	)	$	(7,275	)	$	(11,522	)
	Three Months Ended March 31, 2014
	Net unrealized gain on marketable securities	$	11		$	(3	)	$	14
	Net unrealized gain on hedging instruments	87,083			33,743			53,340
	Net change in post-retirement benefit obligations	(89		)	(35		)	(54		)
	Other comprehensive income	87,005			33,705			53,300
	Less other comprehensive income attributable to noncontrolling interest	58			—			58
	Other comprehensive income attributable to HollyFrontier stockholders	$	86,947		$	33,705		$	53,242
Reclassifications from Other Comprehensive Income to Income Statement	The following table presents the income statement line item effects for reclassifications out of accumulated other comprehensive income (“AOCI”):
	AOCI Component	Gain (Loss) Reclassified From AOCI						Income Statement Line Item
		(In thousands)
		Three Months Ended March 31,
		2015			2014
	Marketable securities	$	(2	)	$	1		Interest income
		42			—			Gain on sale of assets
		40			1
		15			—			Income tax expense
		25			1			Net of tax
	Hedging instruments:
	Commodity price swaps	49,180			(25,331		)	Sales and other revenues
		(40,769		)	29,317			Cost of products sold
		(3,989		)	1,504			Operating expenses
	Interest rate swaps	(531		)	(538		)	Interest expense
		3,891			4,952
		1,630			2,043			Income tax expense
		2,261			2,909			Net of tax
		322			326			Noncontrolling interest
		2,583			3,235			Net of tax and noncontrolling interest
	Total reclassifications for the period	$	2,608		$	3,236
Accumulated Other Comprehensive Loss In Equity	Accumulated other comprehensive income in the equity section of our consolidated balance sheets includes:
		March 31,			December 31,
		2015			2014
		(In thousands)
	Unrealized gain on post-retirement benefit obligations	$	20,689		$	20,689
	Unrealized loss on marketable securities	(44		)	(85		)
	Unrealized gain (loss) on hedging instruments, net of noncontrolling interest	(4,273		)	7,290
	Accumulated other comprehensive income	$	16,372		$	27,894

Postretirement_Plan_Tables

Post-retirement Plan (Tables)	3 Months Ended
	Mar. 31, 2015
Pension and Other Postretirement Benefit Expense [Abstract]
Net Periodic Pension Expense	The net periodic benefit credit of this plan consisted of the following components:
		Three Months Ended March 31,
		2015			2014
		(In thousands)
	Service cost – benefit earned during the period	$	424		$	224
	Interest cost on projected benefit obligations	205			159
	Amortization of prior service credit	(871		)	(1,074		)
	Amortization of net loss	46			—
	Net periodic post-retirement credit	$	(196	)	$	(691	)

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Information [Abstract]
Schedule Of Segment Reporting Information
		Refining		HEP		Corporate			Consolidations			Consolidated
						and Other			and Eliminations			Total
		(In thousands)
	Three Months Ended March 31, 2015
	Sales and other revenues	$	2,989,280	$	89,756	$	218		$	(72,628	)	$	3,006,626
	Depreciation and amortization	$	63,275	$	14,290	$	2,654		$	(207	)	$	80,012
	Income (loss) from operations	$	373,901	$	44,210	$	(28,949	)	$	(540	)	$	388,622
	Capital expenditures	$	129,761	$	38,433	$	4,425		$	—		$	172,619
	Three Months Ended March 31, 2014
	Sales and other revenues	$	4,775,080	$	87,012	$	1,115		$	(72,154	)	$	4,791,053
	Depreciation and amortization	$	63,541	$	15,184	$	2,030		$	(207	)	$	80,548
	Income (loss) from operations	$	251,209	$	45,865	$	(25,555	)	$	(523	)	$	270,996
	Capital expenditures	$	99,943	$	20,604	$	3,734		$	—		$	124,281
	March 31, 2015
	Cash, cash equivalents and total investments in marketable securities	$	196	$	5,802	$	1,002,601		$	—		$	1,008,599
	Total assets	$	7,015,682	$	1,458,019	$	1,106,374		$	(317,948	)	$	9,262,127
	Long-term debt	$	—	$	890,742	$	186,627		$	—		$	1,077,369
	December 31, 2014
	Cash, cash equivalents and total investments in marketable securities	$	88	$	2,830	$	1,039,177		$	—		$	1,042,095
	Total assets	$	6,965,245	$	1,434,572	$	1,150,865		$	(320,042	)	$	9,230,640
	Long-term debt	$	—	$	867,579	$	187,311		$	—		$	1,054,890

Supplemental_GuarantorNonGuara1

Supplemental Guarantor/Non-Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Condensed Consolidating Balance Sheet
	Condensed Consolidating Balance Sheet
	March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	588,246		$	—		$	44		$	—		$	588,290		$	5,802		$	—		$	594,092
	Marketable securities	414,507			—			—			—			414,507			—			—			414,507
	Accounts receivable, net	9,538			518,569			11,299			—			539,406			39,855			(52,408		)	526,853
	Intercompany accounts receivable	—			300,829			421,108			(721,937		)	—			—			—			—
	Inventories	—			1,113,717			—			—			1,113,717			1,961			—			1,115,678
	Prepayments and other	13,308			53,708			—			—			67,016			2,428			(4,796		)	64,648
	Total current assets	1,025,599			1,986,823			432,451			(721,937		)	2,722,936			50,046			(57,204		)	2,715,778
	Properties, plants and equip, net	32,610			2,956,913			950			—			2,990,473			1,046,987			(256,300		)	3,781,160
	Investment in subsidiaries	6,280,300			323,760			—			(6,604,060		)	—			—			—			—
	Intangibles and other assets	30,178			2,378,469			25,000			(25,000		)	2,408,647			360,986			(4,444		)	2,765,189
	Total assets	$	7,368,687		$	7,645,965		$	458,401		$	(7,350,997	)	$	8,122,056		$	1,458,019		$	(317,948	)	$	9,262,127
	LIABILITIES AND EQUITY
	Current liabilities:
	Accounts payable	$	2,852		$	951,974		$	—		$	—		$	954,826		$	28,491		$	(52,408	)	$	930,909
	Intercompany accounts payable	721,937			—			—			(721,937		)	—			—			—			—
	Income tax payable	112,016			—			—			—			112,016			—			—			112,016
	Accrued liabilities	39,545			59,500			1,955			—			101,000			16,771			(4,796		)	112,975
	Deferred income tax liabilities	16,503			—			—			—			16,503			—			—			16,503
	Total current liabilities	892,853			1,011,474			1,955			(721,937		)	1,184,345			45,262			(57,204		)	1,172,403
	Long-term debt	178,908			32,719			—			(25,000		)	186,627			890,742			—			1,077,369
	Liability to HEP	—			230,374			—			—			230,374			—			(230,374		)	—
	Deferred income tax liabilities	630,610			—			—			—			630,610			420			—			631,030
	Other long-term liabilities	43,994			91,098			—			—			135,092			52,322			(5,592		)	181,822
	Investment in HEP	—			—			132,686			—			132,686			—			(132,686		)	—
	Equity – HollyFrontier	5,622,322			6,280,300			323,760			(6,604,060		)	5,622,322			373,154			(368,630		)	5,626,846
	Equity – noncontrolling interest	—			—			—			—			—			96,119			476,538			572,657
	Total liabilities and equity	$	7,368,687		$	7,645,965		$	458,401		$	(7,350,997	)	$	8,122,056		$	1,458,019		$	(317,948	)	$	9,262,127
	Condensed Consolidating Balance Sheet
	December 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	565,080		$	—		$	75		$	—		$	565,155		$	2,830		$	—		$	567,985
	Marketable securities	474,068			42			—			—			474,110			—			—			474,110
	Accounts receivable, net	5,107			579,526			3,774			—			588,407			40,129			(38,631		)	589,905
	Intercompany accounts receivable	—			171,341			397,540			(568,881		)	—			—			—			—
	Inventories	—			1,033,191			—			—			1,033,191			1,940			—			1,035,131
	Income taxes receivable	11,719			—			—			—			11,719			—			—			11,719
	Prepayments and other	14,734			95,194			—			—			109,928			2,443			(8,223		)	104,148
	Total current assets	1,070,708			1,879,294			401,389			(568,881		)	2,782,510			47,342			(46,854		)	2,782,998
	Properties, plants and equip, net	31,808			2,873,350			902			—			2,906,060			1,024,311			(259,832		)	3,670,539
	Investment in subsidiaries	5,912,233			291,912			—			(6,204,145		)	—			—			—			—
	Intangibles and other assets	30,082			2,388,844			25,000			(25,000		)	2,418,926			362,919			(4,742		)	2,777,103
	Total assets	$	7,044,831		$	7,433,400		$	427,291		$	(6,798,026	)	$	8,107,496		$	1,434,572		$	(311,428	)	$	9,230,640
	LIABILITIES AND EQUITY
	Current liabilities:
	Accounts payable	$	11,457		$	1,117,429		$	2		$	—		$	1,128,888		$	17,881		$	(38,631	)	$	1,108,138
	Intercompany accounts payable	568,881			—			—			(568,881		)	—			—			—			—
	Income taxes payable	19,642			—			—			—			19,642			—			—			19,642
	Accrued liabilities	41,403			45,331			1,382			—			88,116			26,321			(8,223		)	106,214
	Deferred income tax liabilities	17,409			—			—			—			17,409			—			—			17,409
	Total current liabilities	658,792			1,162,760			1,384			(568,881		)	1,254,055			44,202			(46,854		)	1,251,403
Long-term debt	179,144			33,167			—			(25,000		)	187,311			867,579			—			1,054,890
Liability to HEP	—			233,217			—			—			233,217			—			(233,217		)	—
Deferred income tax liabilities	646,503			—			—			—			646,503			367			—			646,870
Other long-term liabilities	43,451			92,023			—			—			135,474			47,170			(5,886		)	176,758
Investment in HEP	—			—			133,995			—			133,995			—			(133,995		)	—
Equity – HollyFrontier	5,516,941			5,912,233			291,912			(6,204,145		)	5,516,941			380,172			(373,529		)	5,523,584
Equity – noncontrolling interest	—			—			—			—			—			95,082			482,053			577,135
Total liabilities and equity	$	7,044,831		$	7,433,400		$	427,291		$	(6,798,026	)	$	8,107,496		$	1,434,572		$	(311,428	)	$	9,230,640
Condensed Consolidating Statement of Income and Comprehensive Income
	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	Sales and other revenues	$	106		$	2,989,392		$	—		$	—		$	2,989,498		$	89,756		$	(72,628	)	$	3,006,626
	Operating costs and expenses:
	Cost of products sold	—			2,322,881			—			—			2,322,881			—			(71,508		)	2,251,373
	Lower of cost or market inventory valuation adjustment	—			(6,546		)	—			—			(6,546		)	—			—			(6,546		)
	Operating expenses	—			236,003			—			—			236,003			27,966			(373		)	263,596
	General and administrative	25,824			415			40			—			26,279			3,290			—			29,569
	Depreciation and amortization	2,326			66,924			8			—			69,258			14,290			(3,536		)	80,012
	Total operating costs and expenses	28,150			2,619,677			48			—			2,647,875			45,546			(75,417		)	2,618,004
	Income (loss) from operations	(28,044		)	369,715			(48		)	—			341,623			44,210			2,789			388,622
	Other income (expense):
	Earnings (loss) of equity method investments	384,401			12,035			20,442			(404,977		)	11,901			734			(20,442		)	(7,807		)
	Interest income (expense)	(302		)	2,049			175			—			1,922			(8,767		)	(2,347		)	(9,192		)
	Gain on sale of assets	6			602			—			—			608			158			—			766
		384,105			14,686			20,617			(404,977		)	14,431			(7,875		)	(22,789		)	(16,233		)
	Income before income taxes	356,061			384,401			20,569			(404,977		)	356,054			36,335			(20,000		)	372,389
	Income tax provision	129,627			—			—			—			129,627			101			—			129,728
	Net income	226,434			384,401			20,569			(404,977		)	226,427			36,234			(20,000		)	242,661
	Less net income attributable to noncontrolling interest	—			—			(7		)	—			(7		)	4,027			11,765			15,785
	Net income attributable to HollyFrontier stockholders	$	226,434		$	384,401		$	20,576		$	(404,977	)	$	226,434		$	32,207		$	(31,765	)	$	226,876
	Comprehensive income attributable to HollyFrontier stockholders	$	214,912		$	365,536		$	20,281		$	(385,817	)	$	214,912		$	31,912		$	(31,470	)	$	215,354
	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended March 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	Sales and other revenues	$	101		$	4,775,123		$	971		$	—		$	4,776,195		$	87,012		$	(72,154	)	$	4,791,053
	Operating costs and expenses:
	Cost of products sold	—			4,209,722			—			—			4,209,722			—			(71,102		)	4,138,620
	Operating expenses	—			251,476			—			—			251,476			22,812			(322		)	273,966
	General and administrative	21,107			2,626			39			—			23,772			3,151			—			26,923
	Depreciation and amortization	1,790			67,107			—			—			68,897			15,184			(3,533		)	80,548
	Total operating costs and expenses	22,897			4,530,931			39			—			4,553,867			41,147			(74,957		)	4,520,057
	Income (loss) from operations	(22,796		)	244,192			932			—			222,328			45,865			2,803			270,996
	Other income (expense):
	Earnings (loss) of equity method investments	262,359			16,022			16,283			(279,704		)	14,960			522			(16,283		)	(801		)
	Interest income (expense)	(424		)	2,145			130			—			1,851			(10,451		)	(2,342		)	(10,942		)
	Loss on early extinguishment of debt	—			—			—			—			—			(7,677		)	—			(7,677		)
		261,935			18,167			16,413			(279,704		)	16,811			(17,606		)	(18,625		)	(19,420		)
	Income before income taxes	239,139			262,359			17,345			(279,704		)	239,139			28,259			(15,822		)	251,576
	Income tax provision	87,539			—			—			—			87,539			75			—			87,614
	Net income	151,600			262,359			17,345			(279,704		)	151,600			28,184			(15,822		)	163,962
	Less net income attributable to noncontrolling interest	—			—			—			—			—			3,637			8,264			11,901
	Net income attributable to HollyFrontier stockholders	$	151,600		$	262,359		$	17,345		$	(279,704	)	$	151,600		$	24,547		$	(24,086	)	$	152,061
	Comprehensive income attributable to HollyFrontier stockholders	$	204,842		$	349,384		$	17,382		$	(366,766	)	$	204,842		$	24,585		$	(24,124	)	$	205,303
Condensed Consolidating Statement of Cash Flows
	Condensed Consolidating Statement of Cash Flows
	Three Months Ended March 31, 2015	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	Cash flows from operating activities	$	(68,504	)	$	258,441		$	17,831		$	—		$	207,768		$	60,767		$	(21,643	)	$	246,892
	Cash flows from investing activities
	Additions to properties, plants and equipment	(3,124		)	(131,006		)	(56		)	—			(134,186		)	—			—			(134,186		)
	Additions to properties, plants and equipment – HEP	—			—			—			—			—			(38,433		)	—			(38,433		)
	Other, net	—			814			—			—			814			—			—			814
	Purchases of marketable securities	(118,816		)	—			—			—			(118,816		)	—			—			(118,816		)
	Sales and maturities of marketable securities	178,524			—			—			—			178,524			—			—			178,524
	Net advances to Parent	—			(135,235		)	(17,821		)	153,056			—			—			—			—
		56,584			(265,427		)	(17,877		)	153,056			(73,664		)	(38,433		)	—			(112,097		)
	Cash flows from financing activities
	Net borrowings under credit agreement – HEP	—			—			—			—			—			23,000			—			23,000
	Inventory repurchase obligation	—			7,434			—			—			7,434			—			—			7,434
	Purchase of treasury stock	(55,065		)	—			—			—			(55,065		)	—			—			(55,065		)
	Dividends	(62,335		)	—			—			—			(62,335		)	—			—			(62,335		)
	Distributions to noncontrolling interest	—			—			—			—			—			(42,115		)	21,643			(20,472		)
	Other, net	(570		)	(448		)	15			—			(1,003		)	(247		)	—			(1,250		)
	Net advances from subsidiaries	153,056			—			—			(153,056		)	—			—			—			—
		35,086			6,986			15			(153,056		)	(110,969		)	(19,362		)	21,643			(108,688		)
	Cash and cash equivalents
	Increase (decrease) for the period	23,166			—			(31		)	—			23,135			2,972			—			26,107
	Beginning of period	565,080			—			75			—			565,155			2,830			—			567,985
	End of period	$	588,246		$	—		$	44		$	—		$	588,290		$	5,802		$	—		$	594,092
	Condensed Consolidating Statement of Cash Flows
	Three Months Ended March 31, 2014	Parent			Guarantor			Non-			Eliminations			HollyFrontier			Non-Guarantor			Consolidations and Eliminations			Consolidated
					Restricted			Guarantor						Corp. Before			Non-Restricted
					Subsidiaries			Restricted						Consolidation			Subsidiaries
								Subsidiaries						of HEP			(HEP Segment)
		(In thousands)
	Cash flows from operating activities	$	(23,564	)	$	381,180		$	17,477		$	—		$	375,093		$	39,047		$	(19,211	)	$	394,929
	Cash flows from investing activities:
	Additions to properties, plants and equipment	(3,163		)	(100,483		)	(31		)	—			(103,677		)	—			—			(103,677		)
	Additions to properties, plants and equipment – HEP	—			—			—			—			—			(20,604		)	—			(20,604		)
	Purchases of marketable securities	(244,030		)	—			—			—			(244,030		)	—			—			(244,030		)
	Sales and maturities of marketable securities	253,676			—			—			—			253,676			—			—			253,676
	Other, net	—			1,586			—			—			1,586			—			—			1,586
	Net advances to Parent	—			(302,773		)	(17,412		)	320,185			—			—			—			—
		6,483			(401,670		)	(17,443		)	320,185			(92,445		)	(20,604		)	—			(113,049		)
	Cash flows from financing activities:
	Net borrowings under credit agreement – HEP	—			—			—			—			—			174,700			—			174,700
	Redemption of senior notes	—			—			—			—			—			(156,188		)	—			(156,188		)
	Inventory repurchase obligation				21,126									21,126			—			—			21,126
	Purchase of treasury stock	(13,988		)	—			—			—			(13,988		)	—			—			(13,988		)
	Dividends	(158,614		)	—			—			—			(158,614		)	—			—			(158,614		)
	Distributions to noncontrolling interest	—			—			—			—			—			(38,092		)	19,211			(18,881		)
	Excess tax benefit from equity-based compensation	5,156			—			—			—			5,156			—			—			5,156
	Other, net	—			(398		)	75			—			(323		)	(336		)	—			(659		)
	Net advances from subsidiaries	320,185			—			—			(320,185		)	—			—			—			—
		152,739			20,728			75			(320,185		)	(146,643		)	(19,916		)	19,211			(147,348		)
	Cash and cash equivalents
	Increase (decrease) for the period:	135,658			238			109			—			136,005			(1,473		)	—			134,532
	Beginning of period	931,920			1,817			14			—			933,751			6,352			—			940,103
	End of period	$	1,067,578		$	2,055		$	123		$	—		$	1,069,756		$	4,879		$	—		$	1,074,635

Description_of_Business_and_Pr2

Description of Business and Presentation of Financial Statements (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
	mi
	Petroleum_Refineries
Ownership Interest By Project Type [Line Items]
Number of refineries located in Tulsa, Oklahoma	2
Refinery Distance From Main City [Miles]	65
Allowance for doubtful accounts reserve	$2,400,000
Goodwill, Impairment Loss	$0
Twelve Inch Refined Products Pipeline Project
Ownership Interest By Project Type [Line Items]
Description of pipeline acquired (inches)	12
HEP [Member]
Ownership Interest By Project Type [Line Items]
Percentage of ownership in variable interest entity	39.00%
Percentage of general partner interest	2.00%
HEP [Member] | SLC Pipeline [Member]
Ownership Interest By Project Type [Line Items]
Length of pipeline (miles)	95
SLC Pipeline [Member] | HEP [Member]
Ownership Interest By Project Type [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
UNEV Pipeline [Member]
Ownership Interest By Project Type [Line Items]
Equity Method Investment, Ownership Percentage	75.00%

Variable_Interest_Entity_Detai

Variable Interest Entity (Details) (HEP [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
	Customers
HEP [Member]
Variable Interest Entity [Line Items]
Number of primary customers	2
Percentage of revenue Holly Corp represents	81.00%
Percentage of ownership in variable interest entity	39.00%
Annual contract payment	$231.60

Financial_Instruments_Estimate

Financial Instruments (Estimated Fair Values Of Debt Instruments) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	$615,914	$701,044
Financial Liabilities Fair Value Disclosure	646,849	644,212
Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	6,465	17,619
Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	608,848	683,425
Financial Liabilities Fair Value Disclosure	643,696	644,212
Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	601
Financial Liabilities Fair Value Disclosure	3,153
Investments [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	414,507	474,110
Investments [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	0	0
Investments [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	414,507	474,110
Forward Contracts [Member]
Debt Instrument [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,167
Financial Liabilities Fair Value Disclosure	3,352
Forward Contracts [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,566
Financial Liabilities Fair Value Disclosure	199
Forward Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Derivative Asset, Fair Value, Gross Asset	601
Financial Liabilities Fair Value Disclosure	3,153
Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	154,500	155,250
Senior Notes [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	295,500	291,000
Senior Notes [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	154,500	155,250
Senior Notes [Member] | Level 2 [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	295,500	291,000
Nymex Futures Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	6,465	17,619
Nymex Futures Contracts [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	6,465	17,619
Nymex Futures Contracts [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	0
Interest Rate Swap [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	147	1,019
Financial Liabilities Fair Value Disclosure	942	1,065
Interest Rate Swap [Member] | Level 2 [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	147	1,019
Financial Liabilities Fair Value Disclosure	942	1,065
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	0
Commodity Contract [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	192,628	208,296
Financial Liabilities Fair Value Disclosure	192,555	196,897
Commodity Contract [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	192,628	208,296
Financial Liabilities Fair Value Disclosure	192,555	196,897
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	0
CME SWAPS MARKETS (NYMEX) [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value		0
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	615,914	701,044
Financial Liabilities Fair Value Disclosure	647,499	648,685
Reported Value Measurement [Member] | Investments [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	414,507	474,110
Reported Value Measurement [Member] | Forward Contracts [Member]
Debt Instrument [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,167
Financial Liabilities Fair Value Disclosure	3,352
Reported Value Measurement [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	153,908	154,144
Reported Value Measurement [Member] | Senior Notes [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	296,742	296,579
Reported Value Measurement [Member] | Nymex Futures Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	6,465	17,619
Reported Value Measurement [Member] | Interest Rate Swap [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	147	1,019
Financial Liabilities Fair Value Disclosure	942	1,065
Reported Value Measurement [Member] | Commodity Contract [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	192,628	208,296
Financial Liabilities Fair Value Disclosure	$192,555	$196,897

Financial_Instruments_Changes_

Financial Instruments (Changes in Level 3 Inputs) (Details) (Fair Value, Inputs, Level 3 [Member], Commodity Contract [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liability Balance at Beginning of Period			$0	($35,318)
Liability Balance at End of Period	-2,552	-22,473	0	-35,318
Changes Measurement [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value recognized in other comprehensive income	-2,552	-22,137
Changes Measurement [Member] | Cost of Sales [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value recognized in other comprehensive income	0	8,970
Settlement Date Fair Value of Contractual Maturities [Member] | Cost of Sales [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value recognized in other comprehensive income	0	681
Settlement Date Fair Value of Contractual Maturities [Member] | Sales [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value recognized in other comprehensive income	$0	$25,331

Earnings_Per_Share_Schedule_Of

Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders	$226,876		$152,061
Participating Securities Share in Earnings	644		466
Net income attributable to common shares	$226,232		$151,595
Average number of shares of common stock outstanding	195,069		198,297
Effect of dilutive variable restricted shares and performance share units	52	[1]	627	[1]
Average number of shares of common stock outstanding assuming dilution	195,121		198,924
Basic earnings per share	$1.16		$0.76
Diluted earnings per share	$1.16		$0.76
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	412		14
[1]	(1) Excludes anti-dilutive restricted and performance share units of: 412,000B 14,000B bB b

StockBased_Compensation_Narrat

Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Petroleum_Refineries
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Share-based Compensation Plans	2
Share-based Compensation Expense	$6.30	$5.40
HEP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	$0.90	$0.80
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	2,999
Total unrecognized compensation cost, weighted-average period of recognition, years	1 year 4 months
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement Vesting Period	1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement Vesting Period	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost, weighted-average period of recognition, years	1 year 9 months
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement Vesting Period	3 years

StockBased_Compensation_Summar

Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 4 months
Total unrecognized compensation cost related to non-vested grants	$17,400,000
Fair value of restricted stock vested	100,000
Outstanding at January 1, 2015 (non-vested)	669,777
Granted	8,132
Vesting (transfer/conversion to common stock)	-2,999
Forfeited	-6,046
Outstanding at March 31, 2015 (non-vested)	668,864
Outstanding at January 1, 2015 (non-vested), Weighted Average Grant Date Fair Value	$40.49
Granted, Weighted Average Grant Date Fair Value	$36.59
Vesting and transfer of ownership to recipients, Weighted Average Grant Date Fair Value	$44.48
Forfeited, Weighted Average Grant Date Fair Value, per share	$43.78
Outstanding at March 31, 2015 (non-vested), Weighted Average Grant Date Fair Value	$44.03
Aggregate Intrinsic Value	$26,935,000

StockBased_Compensation_Summar1

Stock-Based Compensation (Summary Of Performance Share Unit Activity) (Details) (Performance Shares [Member], USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$17.60
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months
Outstanding at January 1, 2015 (non-vested)	725,054
Granted	3,654
Forfeited	-11,774
Outstanding at March 31, 2015 (non-vested)	716,934
Current Estimated Percentage Of Share Units Awarded Ultimately Issued	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$43.67
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	3 years
Percentage Of Share Units Awarded Ultimately Issued	200.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Share Units Awarded Ultimately Issued	0.00%

Cash_and_Cash_Equivalents_and_2

Cash and Cash Equivalents and Investments in Marketable Securities (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Maximum term to maturity from date of purchase (years)	1 year
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Income, interest income on Marketable Securities	$0.50	$0.60

Cash_and_Cash_Equivalents_and_3

Cash and Cash Equivalents and Investments in Marketable Securities (Available-For-Sale Securities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Certificates of Deposit [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-Sale Securities, Amortized Cost	$27,000	$54,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	4	10
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Fair Value (Net Carrying Amount)	27,004	54,010
Commercial Paper [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-Sale Securities, Amortized Cost	46,375	52,297
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	16	7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-3	-4
Available-for-sale Securities, Fair Value (Net Carrying Amount)	46,388	52,300
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-Sale Securities, Amortized Cost	112,175	136,181
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	12	1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-47	-94
Available-for-sale Securities, Fair Value (Net Carrying Amount)	112,140	136,088
US States and Political Subdivisions Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-Sale Securities, Amortized Cost	229,039	231,819
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	11	5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-75	-112
Available-for-sale Securities, Fair Value (Net Carrying Amount)	228,975	231,712
Total Marketable Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-Sale Securities, Amortized Cost	414,589	474,297
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	43	23
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	-125	-210
Available-for-sale Securities, Fair Value (Net Carrying Amount)	$414,507	$474,110

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Inventories
Crude Oil	$575,714		$581,592
Other raw materials and unfinished products	199,608	[1]	204,467	[1]
Finished products	614,546	[2]	531,523	[2]
Lower of cost or market reserve	-390,932		-397,478
Process chemicals	4,563	[3]	4,028	[3]
Repairs and maintenance supplies and other	112,179		110,999
Inventories, total	$1,115,678		$1,035,131
[1]	Other raw materials and unfinished products include feedstocks and blendstocks, other than crude.
[2]	Finished products include gasolines, jet fuels, diesels, lubricants, asphalts, LPGbs and residual fuels.
[3]	Process chemicals include additives and other chemicals.Inventories, which are valued at the lower of LIFO cost or market, reflect a valuation reserve of $390.9 million and $397.5 million at MarchB 31, 2015 and DecemberB 31, 2014, respectively. The DecemberB 31, 2014 market reserve of $397.5 million was reversed and reduced cost of products sold during the first quarter of 2015, due to the sale of inventory quantities that gave rise to the reserve. A new market reserve of $390.9 million was established as of MarchB 31, 2015 based on market conditions and prices at that time.

Environmental_Details

Environmental (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Loss Contingencies [Line Items]
Environmental remediation costs	$4.60	$0.30
Accrued environmental liability	105.2		104.5
Estimated time frame to remediate contigency	30
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$82.70		$81.80

Debt_Narrative_Details

Debt (Narrative) (Details) (USD $)	3 Months Ended
	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	6.88%
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

Debt_Carrying_Amounts_Of_LongT

Debt (Carrying Amounts Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total long-term debt	$1,077,369	$1,054,890
Long-term Debt and Capital Lease Obligations	1,077,369	1,054,890
Holly Corporation [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	186,627	187,311
6.875% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Principal	150,000	150,000
Unamortized Premium	3,908	4,144
Total long-term debt	153,908	154,144
Holly Financing Obligation [Member]
Debt Instrument [Line Items]
Financing obligation	32,719	33,167
HEP [Member]
Debt Instrument [Line Items]
HEP Credit Agreement	594,000
Total long-term debt	890,742	867,579
Long-term Debt and Capital Lease Obligations	890,742	867,579
HEP [Member] | Holly Energy Partners Credit Agreement [Member]
Debt Instrument [Line Items]
HEP Credit Agreement	594,000	571,000
HEP [Member] | 6.5% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Principal	300,000	300,000
Unamortized discount	-3,258	-3,421
Total long-term debt	$296,742	$296,579

Derivative_Instruments_And_Hed2

Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Period	1 year
Net unrealized gain in accumulated other comprehensive income related to accounting hedges	($7.40)
Net unrealized gain to be transferred from accumulated other comprehensive income to statement of income	20.1
HEP [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Credit agreement advance	305
Credit agreement advance maturing in 2016	155
Fixed interest rate	0.74%
Rate added to fixed base rate	2.00%
Effective interest rate on debt	2.74%
Credit agreement advance maturing in 2017	$150
HEP [Member] | Current Interest Rate Swap [Member]
Derivative [Line Items]
Fixed interest rate	0.99%
Effective interest rate on debt	2.99%

Derivative_Instruments_And_Hed3

Derivative Instruments And Hedging Activities Interest Rate Swaps (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income	$4,422	$5,490
HEP [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	-1,280	-443
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	531	538
Derivative Instruments, Gain (Loss) Recognized in Income	-749	95
Interest Expense [Member] | HEP [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income	($531)	($538)

Derivative_Instruments_And_Hed4

Derivative Instruments And Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$1,658	($2,160)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	-18,570	86,988
Derivative Instruments, Gain (Loss) Recognized in Income	4,422	5,490
Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	-133
Derivative Instruments, Gain (Loss) Recognized in Income	49,180	-25,331
Cost of Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	1,244
Derivative Instruments, Gain (Loss) Recognized in Income	-40,769	29,317
Operating Expense [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	547	-2,160
Derivative Instruments, Gain (Loss) Recognized in Income	-3,989	1,504
Commodity Contract [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative Instruments, change in fair value	-14,148	92,478
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-4,692	-5,760
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	$270	$270

Derivative_Instruments_And_Hed5

Derivative Instruments And Hedging Activities Location of Gain Loss in Income Statement (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$21,985	($22)
Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	22,281	26
Operating Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	($296)	($48)

Derivative_Instruments_And_Hed6

Derivative Instruments And Hedging Activities Volumes related to price risk purchase derivatives (Details)	3 Months Ended
	Mar. 31, 2015
	MMBTU
Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	26,400,000
WTI Crude Oil [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	3,300,000
Ultra Low Sulfur Diesel [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	3,300,000
Forward Contracts [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	1,760,000
Future [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	625,000
Maturing in Next Twelve Months [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	7,200,000
Maturing in Next Twelve Months [Member] | WTI Crude Oil [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	3,300,000
Maturing in Next Twelve Months [Member] | Ultra Low Sulfur Diesel [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	3,300,000
Maturing in Next Twelve Months [Member] | Forward Contracts [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	1,760,000
Maturing in Next Twelve Months [Member] | Future [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net	625,000
Maturing in Year Two [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	9,600,000
Maturing in Year Three [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	9,600,000

Derivative_Instruments_And_Hed7

Derivative Instruments And Hedging Activities Notional Contracts by Derivative Type (Details) (USD $)	Mar. 31, 2015
economic hedges by derivative type [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	$3,000,000
Commodity Contract [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	6,232,000
Natural Gas Liquids [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,350,000
Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	26,400,000
Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	26,400,000
Commodity WTI short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	564,000
Maturing in Next Twelve Months [Member] | Commodity Contract [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	5,500,000
Maturing in Next Twelve Months [Member] | Natural Gas Liquids [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,350,000
Maturing in Next Twelve Months [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	7,200,000
Maturing in Next Twelve Months [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	7,200,000
Maturing in Next Twelve Months [Member] | Commodity WTI short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	564,000
Maturing in Year Three [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Three [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Two [Member] | Commodity Contract [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	732,000
Maturing in Year Two [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Two [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	$9,600,000

Derivative_Instruments_And_Hed8

Derivative Instruments And Hedging Activities (Summary Of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	$36,619	$54,869
Derivative, Net Liability Position, Aggregate Fair Value	32,061	25,897
Accrued Liabilities [Member]
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	2,386
Other Intangible Assets [Member]
Derivative [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	147	1,019
Prepayments And Other [Member]
Derivative [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	36,472	53,850
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	29,675	25,897
Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	753
Derivative designated as cash flow hedging instrument asset - gross liability	-722
Derivative designated as cash flow hedging instrument asset - net asset	31
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative designated as cash flow hedging instrument asset - gross liability	-7,720	-12,942
Derivative Instruments in Hedges, Assets, at Fair Value	20,835	22,307
Derivative Instruments Not Designated as Hedging Instruments, Loss	0
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	32,489	20,398
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	-28,347	-17,007
Derivative, Net Liability Position, Aggregate Fair Value	4,142	3,391
Derivative Instrument not Designated as Cash Flow Hedging Instrument Asset - Gross Asset	28,555	35,249
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative designated as cash flow hedging instrument asset - gross liability	-7,720	-12,942
Derivative Instruments in Hedges, Assets, at Fair Value	14,370	4,688
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	32,489	20,398
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	-28,347	-17,007
Derivative, Net Liability Position, Aggregate Fair Value	4,142	3,391
Derivative Instrument not Designated as Cash Flow Hedging Instrument Asset - Gross Asset	22,090	17,630
Not Designated as Hedging Instrument [Member] | Nymex Futures Contracts [Member]
Derivative [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	6,465	17,619
Derivative, Net Liability Position, Aggregate Fair Value	0	0
Derivative Instrument not Designated as Cash Flow Hedging Instrument Asset - Gross Asset	6,465	17,619
Derivative Instrument Not Designated as Cash Flow Hedging Instrument Liability - Gross Liability	0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	107,279	174,677
Derivative designated as cash flow hedging instrument asset - gross liability	-91,495	-142,115
Derivative Instruments in Hedges, Assets, at Fair Value	15,784	32,562
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	65,145	22,506
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	-37,226	0
Derivative, Net Liability Position, Aggregate Fair Value	27,919	22,506
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	2,630
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	-1,414
Derivative, Net Liability Position, Aggregate Fair Value	1,216
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	106,379	173,658
Derivative designated as cash flow hedging instrument asset - gross liability	-90,773	-142,115
Derivative Instruments in Hedges, Assets, at Fair Value	15,606	31,543
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	61,573	21,441
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	-35,812	0
Derivative, Net Liability Position, Aggregate Fair Value	25,761	21,441
Designated as Hedging Instrument [Member] | HEP Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	147	1,019
Derivative designated as cash flow hedging instrument asset - gross liability	0	0
Derivative Instruments in Hedges, Assets, at Fair Value	147	1,019
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Liability	942	1,065
Derivative Designated as Cash Flow Hedging Instrument Liability - Gross Asset	0	0
Derivative, Net Liability Position, Aggregate Fair Value	$942	$1,065

Equity_Changes_To_Equity_Detai

Equity (Changes To Equity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014	$5,523,584,000
Net income	242,661,000		163,962,000
Other comprehensive income, after tax	-11,976,000		53,300,000
Payments for Repurchase of Common Stock	55,065,000		13,988,000
Balance at March 31, 2015	5,626,846,000
Shares Paid for Tax Withholding for Share Based Compensation	1,215
Remaining stock repurchase authorization	500
Treasury Stock Acquired Remaining Authorization	461,500,000
Holly Corporation Stockholders' Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014	5,523,584,000
Net income	226,876,000
Dividends	-62,745,000
Distributions to noncontrolling interest holders	0
Other comprehensive income, after tax	-11,522,000
Equity-based compensation	6,329,000
Excess tax benefit attributable to equity-based compensation	-570,000
Payments for Repurchase of Common Stock	-55,106,000	[1]
Purchase of units for incentive grants - HEP	0
Other	0
Balance at March 31, 2015	5,626,846,000
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014	577,135,000
Net income	15,785,000
Dividends	0
Distributions to noncontrolling interest holders	-20,472,000
Other comprehensive income, after tax	-454,000
Equity-based compensation	896,000
Excess tax benefit attributable to equity-based compensation	0
Payments for Repurchase of Common Stock	0	[1]
Purchase of units for incentive grants - HEP	-247,000
Other	14,000
Balance at March 31, 2015	572,657,000
Total Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014	6,100,719,000
Net income	242,661,000
Dividends	-62,745,000
Distributions to noncontrolling interest holders	-20,472,000
Other comprehensive income, after tax	-11,976,000
Equity-based compensation	7,225,000
Excess tax benefit attributable to equity-based compensation	-570,000
Payments for Repurchase of Common Stock	-55,106,000	[1]
Purchase of units for incentive grants - HEP	-247,000
Other	14,000
Balance at March 31, 2015	$6,199,503,000
[1]	Includes 1,215 shares withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards.

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) (Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss) Components and Tax Effects [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	$68	$11
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	0	-89
Other comprehensive income (loss)	-19,251	87,005
Less other comprehensive income attributable to noncontrolling interest	-454	58
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	27	-3
Net unrealized gain (loss) on hedging instruments, tax expense (benefit)	-7,302	33,743
Net change in post-retirement benefit obligations, tax expense (benefit)		-35
Other comprehensive income, tax expense	-7,275	33,705
Net unrealized gain on marketable securities, after tax	41	14
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	-19,319	87,083
Net unrealized gain (loss) on hedging instruments, after tax	-12,017	53,340
Net Change in Post-retirement Benefit Obligations, After Tax		-54
Other comprehensive income, after tax	-11,976	53,300
Less other comprehensive income attributable to noncontrolling interest, after tax	-454	58
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	-18,797	86,947
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	-7,275	33,705
Other Comprehensive Income (Loss) Change in Current Period	($11,522)	$53,242

Other_Comprehensive_Income_Los3

Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
General and Administrative Expense	$29,569	$26,923
Income Tax Expense (Benefit)	129,728	87,614
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	242,661	163,962
Net Income (Loss) Attributable to Noncontrolling Interest	15,785	11,901
Net Income (Loss) Attributable to Parent	226,876	152,061
Refining and Marketing Revenue	3,006,626	4,791,053
Operating Costs and Expenses	263,596	273,966
Interest Expense	10,154	12,347
Other comprehensive income, after tax	-11,976	53,300
Gain (Loss) on Hedging Instruments, Net, Pretax	4,422	5,490
Cost of Sales [Member]
Gain (Loss) on Hedging Instruments, Net, Pretax	-40,769	29,317
Operating Expense [Member]
Gain (Loss) on Hedging Instruments, Net, Pretax	-3,989	1,504
HEP [Member]
Refining and Marketing Revenue	89,756	87,012
Gain (Loss) on Hedging Instruments, Net, Pretax	-749	95
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income, after tax	2,608	3,236
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest Income, Other	-2	1
Gain (Loss) on Disposition of Assets	42	0
Available-for-sale Securities, Gross Realized Gain (Loss)	40	1
Income Tax Expense (Benefit)	15	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	25	1
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Income Tax Expense (Benefit)	1,630	2,043
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,261	2,909
Net Income (Loss) Attributable to Noncontrolling Interest	322	326
Net Income (Loss) Attributable to Parent	2,583	3,235
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	3,891	4,952
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity Contract [Member]
Refining and Marketing Revenue	49,180	-25,331
Cost of Goods Sold	-40,769	29,317
Operating Costs and Expenses	-3,989	1,504
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
Interest Expense	($531)	($538)

Other_Comprehensive_Income_Los4

Other Comprehensive Income (Loss) Other Comprehensive Income Balance Components (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Statement of Comprehensive Income [Abstract]
Unrealized gain on post-retirement benefit obligations	$20,689	$20,689
Unrealized gain on marketable securities	-44	-85
Unrealized gain (loss) on hedging activities, net of noncontrolling interest	-4,273	7,290
Accumulated other comprehensive income	$16,372	$27,894

Postretirement_Plan_Narrative_

Post-retirement Plan (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$11
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	$0.30	$2.60

Postretirement_Plan_Net_Period

Post-retirement Plan (Net Periodic Pension Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period	$424	$224
Interest cost on projected benefit obligations	205	159
Amortization of prior service cost	-871	-1,074
Amortization of net loss	46	0
Net periodic post-retirement expense (credit)	($196)	($691)

Segment_Information_Narrative_

Segment Information (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$17.50	$15.20
Reportable segments	2
SLC Pipeline [Member] | HEP [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
UNEV Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%

Segment_Information_Schedule_O

Segment Information (Schedule Of Segment Reporting Information) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	$1,008,599		$1,042,095
Sales and other revenues	3,006,626	4,791,053
Depreciation and amortization	80,012	80,548
Income (loss) from operations	388,622	270,996
Capital expenditures	172,619	124,281
Total assets	9,262,127		9,230,640
Long-term Debt	1,077,369		1,054,890
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	1,002,601		1,039,177
Sales and other revenues	218	1,115
Depreciation and amortization	2,654	2,030
Income (loss) from operations	-28,949	-25,555
Capital expenditures	4,425	3,734
Total assets	1,106,374		1,150,865
Long-term Debt	186,627		187,311
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	0		0
Sales and other revenues	-72,628	-72,154
Depreciation and amortization	-207	-207
Income (loss) from operations	-540	-523
Capital expenditures	0	0
Total assets	-317,948		-320,042
Long-term Debt	0		0
2911 Petroleum Refining [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	196		88
Sales and other revenues	2,989,280	4,775,080
Depreciation and amortization	63,275	63,541
Income (loss) from operations	373,901	251,209
Capital expenditures	129,761	99,943
Total assets	7,015,682		6,965,245
Long-term Debt	0		0
HEP [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	5,802		2,830
Sales and other revenues	89,756	87,012
Depreciation and amortization	14,290	15,184
Income (loss) from operations	44,210	45,865
Capital expenditures	38,433	20,604
Total assets	1,458,019		1,434,572
Long-term Debt	$890,742		$867,579

Supplemental_GuarantorNonGuara2

Supplemental Guarantor/Non-Guarantor Financial Information (Narrative) (Details) (HEP [Member])	3 Months Ended
	Mar. 31, 2015
HEP [Member]
Guarantor Obligations [Line Items]
Percentage of ownership in variable interest entity	39.00%

Supplemental_GuarantorNonGuara3

Supplemental Guarantor/Non-Guarantor Financial Information Consolidating Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$594,092	$567,985	$1,074,635	$940,103
Marketable securities	414,507	474,110
Accounts receivable, net	526,853	589,905
Intercompany accounts receivable	0	0
Inventories	1,115,678	1,035,131
Income taxes receivable	0	11,719
Prepayments and other	64,648	104,148
Total current assets	2,715,778	2,782,998
Properties, plants and equipment, net	3,781,160	3,670,539
Investment in subsidiaries	0	0
Intangibles and other assets	2,765,189	2,777,103
Total assets	9,262,127	9,230,640
Accounts payable	930,909	1,108,138
Due to Affiliate, Current	0	0
Accrued Income Taxes	112,016	19,642
Accrued liabilities	112,975	106,214
Deferred income tax liabilities	16,503	17,409
Total current liabilities	1,172,403	1,251,403
Long-term debt	1,077,369	1,054,890
Liability to HEP	0	0
Deferred income tax liabilities	631,030	646,870
Other long-term liabilities	181,822	176,758
Investment in HEP	0	0
Equity b HollyFrontier	5,626,846	5,523,584
Equity b noncontrolling interest	572,657	577,135
Total liabilities and equity	9,262,127	9,230,640
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	588,246	565,080	1,067,578	931,920
Marketable securities	414,507	474,068
Accounts receivable, net	9,538	5,107
Intercompany accounts receivable	0	0
Inventories	0	0
Income taxes receivable		11,719
Prepayments and other	13,308	14,734
Total current assets	1,025,599	1,070,708
Properties, plants and equipment, net	32,610	31,808
Investment in subsidiaries	6,280,300	5,912,233
Intangibles and other assets	30,178	30,082
Total assets	7,368,687	7,044,831
Accounts payable	2,852	11,457
Due to Affiliate, Current	721,937	568,881
Accrued Income Taxes	112,016	19,642
Accrued liabilities	39,545	41,403
Deferred income tax liabilities	16,503	17,409
Total current liabilities	892,853	658,792
Long-term debt	178,908	179,144
Liability to HEP	0	0
Deferred income tax liabilities	630,610	646,503
Other long-term liabilities	43,994	43,451
Investment in HEP	0	0
Equity b HollyFrontier	5,622,322	5,516,941
Equity b noncontrolling interest	0	0
Total liabilities and equity	7,368,687	7,044,831
Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	2,055	1,817
Marketable securities	0	42
Accounts receivable, net	518,569	579,526
Intercompany accounts receivable	300,829	171,341
Inventories	1,113,717	1,033,191
Income taxes receivable		0
Prepayments and other	53,708	95,194
Total current assets	1,986,823	1,879,294
Properties, plants and equipment, net	2,956,913	2,873,350
Investment in subsidiaries	323,760	291,912
Intangibles and other assets	2,378,469	2,388,844
Total assets	7,645,965	7,433,400
Accounts payable	951,974	1,117,429
Due to Affiliate, Current	0	0
Accrued Income Taxes	0	0
Accrued liabilities	59,500	45,331
Deferred income tax liabilities	0	0
Total current liabilities	1,011,474	1,162,760
Long-term debt	32,719	33,167
Liability to HEP	230,374	233,217
Deferred income tax liabilities	0	0
Other long-term liabilities	91,098	92,023
Investment in HEP	0	0
Equity b HollyFrontier	6,280,300	5,912,233
Equity b noncontrolling interest	0	0
Total liabilities and equity	7,645,965	7,433,400
Non Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	44	75	123	14
Marketable securities	0	0
Accounts receivable, net	11,299	3,774
Intercompany accounts receivable	421,108	397,540
Inventories	0	0
Income taxes receivable		0
Prepayments and other	0	0
Total current assets	432,451	401,389
Properties, plants and equipment, net	950	902
Investment in subsidiaries	0	0
Intangibles and other assets	25,000	25,000
Total assets	458,401	427,291
Accounts payable	0	2
Due to Affiliate, Current	0	0
Accrued Income Taxes	0	0
Accrued liabilities	1,955	1,382
Deferred income tax liabilities	0	0
Total current liabilities	1,955	1,384
Long-term debt	0	0
Liability to HEP	0	0
Deferred income tax liabilities	0	0
Other long-term liabilities	0	0
Investment in HEP	132,686	133,995
Equity b HollyFrontier	323,760	291,912
Equity b noncontrolling interest	0	0
Total liabilities and equity	458,401	427,291
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Marketable securities	0	0
Accounts receivable, net	0	0
Intercompany accounts receivable	-721,937	-568,881
Inventories	0	0
Income taxes receivable		0
Prepayments and other	0	0
Total current assets	-721,937	-568,881
Properties, plants and equipment, net	0	0
Investment in subsidiaries	-6,604,060	-6,204,145
Intangibles and other assets	-25,000	-25,000
Total assets	-7,350,997	-6,798,026
Accounts payable	0	0
Due to Affiliate, Current	-721,937	-568,881
Accrued Income Taxes	0	0
Accrued liabilities	0	0
Deferred income tax liabilities	0	0
Total current liabilities	-721,937	-568,881
Long-term debt	-25,000	-25,000
Liability to HEP	0	0
Deferred income tax liabilities	0	0
Other long-term liabilities	0	0
Investment in HEP	0	0
Equity b HollyFrontier	-6,604,060	-6,204,145
Equity b noncontrolling interest	0	0
Total liabilities and equity	-7,350,997	-6,798,026
Holly Frontier Corp. Before Consolidation Of HEP [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	588,290	565,155	1,069,756	933,751
Marketable securities	414,507	474,110
Accounts receivable, net	539,406	588,407
Intercompany accounts receivable	0	0
Inventories	1,113,717	1,033,191
Income taxes receivable		11,719
Prepayments and other	67,016	109,928
Total current assets	2,722,936	2,782,510
Properties, plants and equipment, net	2,990,473	2,906,060
Investment in subsidiaries	0	0
Intangibles and other assets	2,408,647	2,418,926
Total assets	8,122,056	8,107,496
Accounts payable	954,826	1,128,888
Due to Affiliate, Current	0	0
Accrued Income Taxes	112,016	19,642
Accrued liabilities	101,000	88,116
Deferred income tax liabilities	16,503	17,409
Total current liabilities	1,184,345	1,254,055
Long-term debt	186,627	187,311
Liability to HEP	230,374	233,217
Deferred income tax liabilities	630,610	646,503
Other long-term liabilities	135,092	135,474
Investment in HEP	132,686	133,995
Equity b HollyFrontier	5,622,322	5,516,941
Equity b noncontrolling interest	0	0
Total liabilities and equity	8,122,056	8,107,496
Non-Guarantor Non-Restricted Subsidiaries (HEP Segment) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5,802	2,830	4,879	6,352
Marketable securities	0	0
Accounts receivable, net	39,855	40,129
Intercompany accounts receivable	0	0
Inventories	1,961	1,940
Income taxes receivable		0
Prepayments and other	2,428	2,443
Total current assets	50,046	47,342
Properties, plants and equipment, net	1,046,987	1,024,311
Investment in subsidiaries	0	0
Intangibles and other assets	360,986	362,919
Total assets	1,458,019	1,434,572
Accounts payable	28,491	17,881
Due to Affiliate, Current	0	0
Accrued Income Taxes		0
Accrued liabilities	16,771	26,321
Deferred income tax liabilities	0	0
Total current liabilities	45,262	44,202
Long-term debt	890,742	867,579
Liability to HEP	0	0
Deferred income tax liabilities	420	367
Other long-term liabilities	52,322	47,170
Investment in HEP	0	0
Equity b HollyFrontier	373,154	380,172
Equity b noncontrolling interest	96,119	95,082
Total liabilities and equity	1,458,019	1,434,572
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Marketable securities	0	0
Accounts receivable, net	-52,408	-38,631
Intercompany accounts receivable	0	0
Inventories	0	0
Income taxes receivable		0
Prepayments and other	-4,796	-8,223
Total current assets	-57,204	-46,854
Properties, plants and equipment, net	-256,300	-259,832
Investment in subsidiaries	0	0
Intangibles and other assets	-4,444	-4,742
Total assets	-317,948	-311,428
Accounts payable	-52,408	-38,631
Due to Affiliate, Current	0	0
Accrued Income Taxes	0	0
Accrued liabilities	-4,796	-8,223
Deferred income tax liabilities	0	0
Total current liabilities	-57,204	-46,854
Long-term debt	0	0
Liability to HEP	-230,374	-233,217
Deferred income tax liabilities	0	0
Other long-term liabilities	-5,592	-5,886
Investment in HEP	-132,686	-133,995
Equity b HollyFrontier	-368,630	-373,529
Equity b noncontrolling interest	476,538	482,053
Total liabilities and equity	($317,948)	($311,428)

Supplemental_GuarantorNonGuara4

Supplemental Guarantor/Non-Guarantor Financial Information Consolidating Statement of Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	$3,006,626	$4,791,053
Cost of products sold	2,251,373	4,138,620
Lower of cost or market inventory valuation adjustment	-6,546	0
Operating Costs and Expenses	263,596	273,966
General and administrative	29,569	26,923
Depreciation and amortization	80,012	80,548
Total operating costs and expenses	2,618,004	4,520,057
Income (loss) from operations	388,622	270,996
Earnings (loss) of equity method investments	-7,807	-801
Interest income (expense)	-9,192	-10,942
Loss on early extinguishment of debt	0	-7,677
Gain on sale of assets	766	0
Nonoperating Income (Expense)	-16,233	-19,420
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	372,389	251,576
Income tax provision	129,728	87,614
Net income	242,661	163,962
Less net income attributable to noncontrolling interest	15,785	11,901
Net income attributable to HollyFrontier stockholders	226,876	152,061
Comprehensive income attributable to HollyFrontier stockholders	215,354	205,303
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	106	101
Cost of products sold	0	0
Lower of cost or market inventory valuation adjustment	0
Operating Costs and Expenses	0	0
General and administrative	25,824	21,107
Depreciation and amortization	2,326	1,790
Total operating costs and expenses	28,150	22,897
Income (loss) from operations	-28,044	-22,796
Earnings (loss) of equity method investments	384,401	262,359
Interest income (expense)	-302	-424
Loss on early extinguishment of debt		0
Gain on sale of assets	6
Nonoperating Income (Expense)	384,105	261,935
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	356,061	239,139
Income tax provision	129,627	87,539
Net income	226,434	151,600
Less net income attributable to noncontrolling interest	0	0
Net income attributable to HollyFrontier stockholders	226,434	151,600
Comprehensive income attributable to HollyFrontier stockholders	214,912	204,842
Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	2,989,392	4,775,123
Cost of products sold	2,322,881	4,209,722
Lower of cost or market inventory valuation adjustment	-6,546
Operating Costs and Expenses	236,003	251,476
General and administrative	415	2,626
Depreciation and amortization	66,924	67,107
Total operating costs and expenses	2,619,677	4,530,931
Income (loss) from operations	369,715	244,192
Earnings (loss) of equity method investments	12,035	16,022
Interest income (expense)	2,049	2,145
Loss on early extinguishment of debt		0
Gain on sale of assets	602
Nonoperating Income (Expense)	14,686	18,167
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	384,401	262,359
Income tax provision	0	0
Net income	384,401	262,359
Less net income attributable to noncontrolling interest	0	0
Net income attributable to HollyFrontier stockholders	384,401	262,359
Comprehensive income attributable to HollyFrontier stockholders	365,536	349,384
Non Guarantor Restricted Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	0	971
Cost of products sold	0	0
Lower of cost or market inventory valuation adjustment	0
Operating Costs and Expenses	0	0
General and administrative	40	39
Depreciation and amortization	8	0
Total operating costs and expenses	48	39
Income (loss) from operations	-48	932
Earnings (loss) of equity method investments	20,442	16,283
Interest income (expense)	175	130
Loss on early extinguishment of debt		0
Gain on sale of assets	0
Nonoperating Income (Expense)	20,617	16,413
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	20,569	17,345
Income tax provision	0	0
Net income	20,569	17,345
Less net income attributable to noncontrolling interest	-7	0
Net income attributable to HollyFrontier stockholders	20,576	17,345
Comprehensive income attributable to HollyFrontier stockholders	20,281	17,382
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	0	0
Cost of products sold	0	0
Lower of cost or market inventory valuation adjustment	0
Operating Costs and Expenses	0	0
General and administrative	0	0
Depreciation and amortization	0	0
Total operating costs and expenses	0	0
Income (loss) from operations	0	0
Earnings (loss) of equity method investments	-404,977	-279,704
Interest income (expense)	0	0
Loss on early extinguishment of debt		0
Gain on sale of assets	0
Nonoperating Income (Expense)	-404,977	-279,704
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	-404,977	-279,704
Income tax provision	0	0
Net income	-404,977	-279,704
Less net income attributable to noncontrolling interest	0	0
Net income attributable to HollyFrontier stockholders	-404,977	-279,704
Comprehensive income attributable to HollyFrontier stockholders	-385,817	-366,766
Holly Frontier Corp. Before Consolidation Of HEP [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	2,989,498	4,776,195
Cost of products sold	2,322,881	4,209,722
Lower of cost or market inventory valuation adjustment	-6,546
Operating Costs and Expenses	236,003	251,476
General and administrative	26,279	23,772
Depreciation and amortization	69,258	68,897
Total operating costs and expenses	2,647,875	4,553,867
Income (loss) from operations	341,623	222,328
Earnings (loss) of equity method investments	11,901	14,960
Interest income (expense)	1,922	1,851
Loss on early extinguishment of debt		0
Gain on sale of assets	608
Nonoperating Income (Expense)	14,431	16,811
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	356,054	239,139
Income tax provision	129,627	87,539
Net income	226,427	151,600
Less net income attributable to noncontrolling interest	-7	0
Net income attributable to HollyFrontier stockholders	226,434	151,600
Comprehensive income attributable to HollyFrontier stockholders	214,912	204,842
Non-Guarantor Non-Restricted Subsidiaries (HEP Segment) [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	89,756	87,012
Cost of products sold	0	0
Lower of cost or market inventory valuation adjustment	0
Operating Costs and Expenses	27,966	22,812
General and administrative	3,290	3,151
Depreciation and amortization	14,290	15,184
Total operating costs and expenses	45,546	41,147
Income (loss) from operations	44,210	45,865
Earnings (loss) of equity method investments	734	522
Interest income (expense)	-8,767	-10,451
Loss on early extinguishment of debt		-7,677
Gain on sale of assets	158
Nonoperating Income (Expense)	-7,875	-17,606
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	36,335	28,259
Income tax provision	101	75
Net income	36,234	28,184
Less net income attributable to noncontrolling interest	4,027	3,637
Net income attributable to HollyFrontier stockholders	32,207	24,547
Comprehensive income attributable to HollyFrontier stockholders	31,912	24,585
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Sales and other revenues	-72,628	-72,154
Cost of products sold	-71,508	-71,102
Lower of cost or market inventory valuation adjustment	0
Operating Costs and Expenses	-373	-322
General and administrative	0	0
Depreciation and amortization	-3,536	-3,533
Total operating costs and expenses	-75,417	-74,957
Income (loss) from operations	2,789	2,803
Earnings (loss) of equity method investments	-20,442	-16,283
Interest income (expense)	-2,347	-2,342
Loss on early extinguishment of debt		0
Gain on sale of assets	0
Nonoperating Income (Expense)	-22,789	-18,625
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	-20,000	-15,822
Income tax provision	0	0
Net income	-20,000	-15,822
Less net income attributable to noncontrolling interest	11,765	8,264
Net income attributable to HollyFrontier stockholders	-31,765	-24,086
Comprehensive income attributable to HollyFrontier stockholders	($31,470)	($24,124)

Supplemental_GuarantorNonGuara5

Supplemental Guarantor/Non-Guarantor Financial Information Consolidating Statement of Cash Flows (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	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	0	0
Net cash used for investing activities	-112,097	-113,049
Net repayments under credit agreement b HEP		-174,700
Net borrowings under credit agreement b HEP	-23,000
Redemption of Senior Notes - HEP		-156,188
Proceeds from product financing arrangement	7,434	21,126
Purchase of treasury stock	-55,065	-13,988
Dividends	-62,335	-158,614
Excess tax benefit from equity based compensation	0	5,156
Other, net	-1,250	-659
Net advances from subsidiaries	0	0
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 b 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 b 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 b 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 b HEP		0
Net borrowings under credit agreement b 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 b 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 b HEP		-174,700
Net borrowings under credit agreement b 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 b 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 b 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 b 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 b 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 b HEP		0
Net borrowings under credit agreement b HEP	$0