Holly Energy Partners (HEP) 10-K 25 Feb 15 2014 FY Annual report Financial data

Document_Entity_Information

Document Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	HOLLY ENERGY PARTNERS LP
Entity Central Index Key	1283140
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		58,657,048
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$1,200,000,000

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$2,830	$6,352
Accounts receivable:
Trade	6,737	5,061
Affiliates	33,392	29,675
Total accounts receivable	40,129	34,736
Prepaid and other current assets	4,383	3,874
Total current assets	47,342	44,962
Properties and equipment, net	980,479	957,814
Transportation agreements, net	80,703	87,650
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,478	24,741
Other assets	12,055	10,843
Total assets	1,401,555	1,382,508
Accounts payable:
Trade	12,642	14,414
Affiliates	5,239	8,484
Total accounts payable	17,881	22,898
Accrued interest	6,615	10,239
Deferred revenue	12,432	13,981
Accrued property taxes	2,703	2,603
Other current liabilities	4,571	1,845
Total current liabilities	44,202	51,566
Long-term debt	867,579	807,630
Other long-term liabilities	18,145	14,585
Deferred Revenue	29,392	21,669
Class B unit	26,793	20,124
Partners’ equity:
Common unitholders (58,657,048 units issued and outstanding at December 31, 2014 and 2013)	468,813	516,147
General partner interest (2% interest)	-148,405	-146,557
Accumulated other comprehensive loss	-46	-144
Total partners’ equity	320,362	369,446
Noncontrolling interest	95,082	97,488
Total Equity	415,444	466,934
Total liabilities and equity	$1,401,555	$1,382,508

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Partners' Equity:
Common units issued	58,657,048	58,657,048
Common units outstanding	58,657,048	58,657,048
General partner interest	2.00%

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Affiliates	$275,196	$252,368	$245,582
Third parties	57,349	52,814	46,978
Total revenues	332,545	305,182	292,560
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)	104,801	99,444	89,242
Depreciation and amortization	62,166	65,423	57,461
General and administrative	10,824	11,749	7,594
Total operating costs and expenses	177,791	176,616	154,297
Operating income	154,754	128,566	138,263
Other income (expense):
Equity in earnings of SLC Pipeline	0	0	0
Interest expense	-36,101	-47,010	-47,182
Interest Income	3	161	0
Loss on early extinguishment of debt	-7,677	0	-2,979
Gain on sale of assets	0	1,810	0
Other Income	82	61	10
Total other income (expense)	-40,706	-42,152	-46,787
Income before Income Taxes	114,048	86,414	91,476
State income tax expense	-235	-333	-371
Net Income	113,813	86,081	91,105
Allocation of net loss attributable to Predecessors	0	0	4,200
Allocation of net income (loss) attributable to noncontrolling interest	-8,288	-6,632	-1,153
Net income attributable to Holly Energy Partners	105,525	79,449	94,152
General partner interest in net income, including incentive distributions	-34,667	-27,523	-22,450
Limited partners’ interest in net income	70,858	51,926	71,702
Limited partners’ per unit interest in earnings—basic and diluted:	$1.20	$0.88	$1.29
Weighted average limited partners’ units outstanding	58,657	58,246	55,696
SLC Pipeline [Member]
Other income (expense):
Equity in earnings of SLC Pipeline	$2,987	$2,826	$3,364

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$113,813	$86,081	$91,105
Change in fair value of cash flow hedging instruments	-2,104	1,194	-4,418
Amortization of unrealized loss attributable to discontinued cash flow hedge	0	849	5,095
Reclassification adjustment to net income on partial settlement of cash flow hedge	2,202	2,092	1,508
Other comprehensive income	98	4,135	2,185
Comprehensive income before noncontrolling interest	113,911	90,216	93,290
Allocation of comprehensive (income) loss to noncontrolling interests	-8,288	-6,632	-1,153
Allocation of net loss attributable to Predecessors	0	0	4,200
Comprehensive income attributable to Holly Energy Partners	$105,623	$83,584	$96,337

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$113,813	$86,081	$91,105
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,166	65,423	57,461
Gain on sale of assets	0	-1,810	0
Amortization of deferred charges	1,820	2,970	7,556
Amortization of restricted and performance units	3,539	3,575	2,858
Loss on early extinguishment of debt	7,677	0	2,979
(Increase) decrease in operating assets:
Accounts receivable – trade	-1,676	2,065	-3,997
Accounts receivable – affiliates	-3,717	1,919	-135
Prepaid and other current assets	-510	-255	110
Increase (decrease) in operating liabilities:
Accounts payable – trade	2,469	3,365	-9,003
Accounts payable – affiliates	-3,245	3,821	-1,811
Accrued interest	-3,624	13	1,945
Deferred revenue	6,173	15,255	11,333
Accrued property taxes	100	-85	492
Other current liabilities	1,819	-45	113
Other, net	-164	788	143
Net cash provided by operating activities	186,640	183,080	161,149
Cash flows from investing activities
Additions to properties and equipment	-79,959	-52,101	-42,861
Proceeds from sale of assets	0	2,731	0
Distributions in Excess of Equity in Earnings in SLC Pipeline	263	300	262
Net cash used for investing activities	-79,696	-49,070	-42,599
Cash flows from financing activities
Borrowings under credit agreement	642,300	310,600	587,000
Repayments of credit agreement borrowings	-434,300	-368,600	-366,000
Proceeds from issuance of senior notes	0	0	294,750
Proceeds from issuance of common units	0	73,444	0
Cash distribution to HFC for UNEV acquisition	0	0	-260,922
Repayments of senior notes	-156,188	0	-260,235
Contributions from noncontrolling interests	0	0	15,000
Contribution from general partner		1,499	1,748
Distributions to HEP unitholders	-154,670	-139,486	-122,777
Distributions to noncontrolling interest	-4,025	-3,125	0
Purchase of units for incentive grants	-3,577	-5,634	-4,919
Deferred financing costs	0	-1,344	-3,238
Other	-6	-249	-89
Net cash used by financing activities	-110,466	-132,895	-119,682
Cash and cash equivalents
Increase (decrease) for the year	-3,522	1,115	-1,132
Beginning of period	6,352	5,237	6,369
End of period	$2,830	$6,352	$5,237

Consolidated_Statement_of_Part

Consolidated Statement of Partners' Equity (USD $)	Total	Common Units	General Partner Interest	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
In Thousands, unless otherwise specified
Beginning balance at Dec. 31, 2011	$737,678	$481,439	$163,701	($6,464)	$99,002
Increase (Decrease) in Partners' Equity [Roll Forward]
Capital contribution	13,286		10,286		3,000
Distributions to HEP unitholders	-122,777	-99,744	-23,033
Cash distribution	-260,922		-260,922
Issuance of common units		45,839	-45,839
Issuance of Class B unit	-12,200		-12,200
Purchase of Units for Incentive Grants	-4,713	-4,713
Amortization of restricted and performance units	2,858	2,858
Class B unit accretion	-1,703	-1,694	-9
Partners' Capital Account, Acquisitions	7,947	7,947
Other	112		112
Net income	91,105	70,877	22,027
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest					-1,799
Other comprehensive income	2,185			2,185
Ending balance at Dec. 31, 2012	452,856	502,809	-145,877	-4,279	100,203
Increase (Decrease) in Partners' Equity [Roll Forward]
Capital contribution	1,499		1,499
Stock Issued During Period, Value, Other	73,444	73,444
Distributions to HEP unitholders	-139,486	-112,039	-27,447
Cash distribution	0
Purchase of Units for Incentive Grants	-5,313	-5,313
Amortization of restricted and performance units	3,575	3,575
Class B unit accretion	-6,221	-6,097	-124
Distributions to noncontrolling interests	-3,125				-3,125
Other	-511	-248	-263
Net income	86,081	60,016	25,655
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest					410
Other comprehensive income	4,135			4,135
Ending balance at Dec. 31, 2013	466,934	516,147	-146,557	-144	97,488
Increase (Decrease) in Partners' Equity [Roll Forward]
Distributions to HEP unitholders	-154,670	-119,944	-34,726
Cash distribution	0
Purchase of Units for Incentive Grants	-3,577	-3,577
Amortization of restricted and performance units	3,539	3,539
Class B unit accretion	-6,668	-6,534	-134
Distributions to noncontrolling interests	-4,025				-4,025
Net income	113,813	79,182	33,012
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest					1,619
Other comprehensive income	98			98
Ending balance at Dec. 31, 2014	$415,444	$468,813	($148,405)	($46)	$95,082

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies
	Holly Energy Partners, L.P. (“HEP”) together with its consolidated subsidiaries, is a publicly held master limited partnership which is 39% owned (including the 2% general partner interest) by HollyFrontier Corporation (“HFC”) and its subsidiaries. We commenced operations on July 13, 2004, upon the completion of our initial public offering. In these consolidated financial statements, the words “we,” “our,” “ours” and “us” refer to HEP unless the context otherwise indicates.
	We operate in one reportable segment which represents the aggregation of our petroleum product and crude pipelines business and terminals, tankage and loading rack facilities operations.
	We own and operate petroleum product and crude oil pipelines and terminal, tankage and loading rack facilities that support HFC’s 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, we own a 75% interest in the UNEV Pipeline, LLC (“UNEV”), which owns a 427-mile, 12-inch refined products pipeline running from Woods Cross, Utah to Las Vegas, Nevada (the “UNEV Pipeline”), product terminals near Cedar City, Utah and Las Vegas, Nevada and related assets, and a 25% interest in SLC Pipeline LLC, which owns a 95-mile intrastate crude oil pipeline system (the “SLC Pipeline”) that serves refineries in the Salt Lake City, Utah area.
	We generate revenues by charging tariffs for transporting petroleum products and crude oil through our pipelines, by charging fees for terminalling and storing refined products and other hydrocarbons and providing other services at our storage tanks and terminals. We do not take ownership of products that we transport, terminal or store, and therefore, we are not exposed directly to changes in commodity prices.
	Principles of Consolidation and Common Control Transactions
	The consolidated financial statements include our accounts and those of subsidiaries and joint ventures that we control through a 50% or more ownership interest. All significant inter-company transactions and balances have been eliminated.
	Most of our asset acquisitions from HFC occurred while we were a consolidated variable interest entity of HFC. Therefore, as an entity under common control with HFC, we recorded these assets on our balance sheets at HFC's historical basis instead of our purchase price or fair value.
	Use of Estimates
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
	Cash and Cash Equivalents
	For purposes of the statements of cash flows, we consider all highly liquid investments with maturities of three months or less at the time of purchase to be cash equivalents. The carrying amounts reported on the balance sheets approximate fair value due to the short-term maturity of these instruments.
	Accounts Receivable
	The majority of the accounts receivable are due from affiliates of HFC, Alon or independent companies in the petroleum industry. Credit is extended based on evaluation of the customer's financial condition and, in certain circumstances, collateral such as letters of credit or guarantees, may be required. Credit losses are charged to income when accounts are deemed uncollectible and historically have been minimal.
	Properties and Equipment
	Properties and equipment are stated at cost. Properties and equipment acquired from HFC while under common control of HFC are stated at HFC's historical basis. Depreciation is provided by the straight-line method over the estimated useful lives of the assets, primarily 15 to 25 years for terminal facilities and tankage, 25 to 32 years for pipelines and 5 to 10 years for corporate and other assets. We depreciate assets acquired under capital leases over the lesser of the lease term or the economic life of the assets. Maintenance, repairs and minor replacements are expensed as incurred. Costs of replacements constituting improvements are capitalized.
	Transportation Agreements
	The transportation agreement assets are stated at acquisition date fair value and are being amortized over the periods of the agreements using the straight-line method. See Note 5 for additional information on our transportation agreements.
	Goodwill and Long-Lived Assets
	Goodwill represents the excess of our cost of an acquired business over the fair value of the assets acquired, less liabilities assumed. Goodwill is not amortized and is tested for impairment annually or more frequently if events or changes in circumstances indicate goodwill may be impaired. We test goodwill at the reporting unit level for impairment annually and between annual tests if events or changes in circumstances indicate the carrying amount may exceed fair value. Recoverability is determined by comparing the estimated fair value of a reporting unit to the carrying value, including the related goodwill, of that reporting unit. We use the present value of the expected future net cash flows and market multiple analyses to determine the estimated fair values of the reporting units. The impairment test requires the use of projections, estimates and assumptions as to the future performance of our operations. Actual results could differ from projections resulting in revisions to our assumptions, and if required, recognizing an impairment loss.
	We evaluate long-lived assets, including finite intangible assets, for potential impairment by identifying whether indicators of impairment exist and, if so, assessing whether the long-lived assets are recoverable from estimated future undiscounted cash flows. The actual amount of impairment loss, if any, to be recorded is equal to the amount by which a long-lived asset's carrying value exceeds its fair value.
	There have been no impairments to goodwill or our long-lived assets as of December 31, 2014.
	Investment in SLC Pipeline
	We account for our 25% SLC Pipeline joint venture interest using the equity method of accounting, whereby we record our pro-rata share of earnings of the SLC Pipeline, and contributions to and distributions from the SLC Pipeline as adjustments to our investment balance. As of December 31, 2014, our underlying equity in the SLC Pipeline was $58.9 million compared to our recorded investment balance of $24.5 million, a difference of $34.4 million. We are amortizing this difference as an adjustment to our pro-rata share of earnings over the useful lives of the underlying assets of SLC Pipeline.
	Asset Retirement Obligations
	We record legal obligations associated with the retirement of certain of our long-lived assets that result from the acquisition, construction, development and/or the normal operation of our long-lived assets. The fair value of the estimated cost to retire a tangible long-lived asset is recorded in the period in which the liability is incurred and when a reasonable estimate of the fair value of the liability can be made. For our pipeline assets, the right-of-way agreements typically do not require the dismantling, removal and reclamation of the right-of-way upon cessation of the pipeline service. Additionally, management is unable to predict when, or if, our pipelines and related facilities would become obsolete and require decommissioning. Accordingly, we have recorded no liability or corresponding asset related to an asset retirement obligation for the majority of our pipelines as both the amounts and timing of such potential future costs are indeterminable. For our remaining assets, at December 31, 2014 and 2013, we have asset retirement obligations of $6.8 million and $6.5 million, respectively, that are recorded under “Other long-term liabilities” in our consolidated balance sheets.
	Revenue Recognition
	Revenues are recognized as products are shipped through our pipelines and terminals or other services are rendered. Billings to customers for their obligations under their quarterly minimum revenue commitments are recorded as deferred revenue liabilities if the customer has the right to receive future services for these billings. The revenue is recognized at the earlier of:
	•	the customer receiving the future services provided by these billings,
	•	the period in which the customer is contractually allowed to receive the services expires, or
	•	our determination that we will not be required to provide services within the allowed period.
	We determine that we will not be required to provide services within the allowed period when, based on current and projected shipping levels, our pipeline systems will not have the necessary capacity to enable a customer to exceed its minimum volume levels to such a degree as to utilize the shortfall credit within its respective contractual shortfall make-up period.
	We have additional revenues under an operating lease to a third party of an interest in the capacity of one of our pipelines.
	As of December 31, 2014, billings to customers under their minimum revenue commitments per the terms of long-term throughput agreements expiring in 2019 through 2026 and the third party operating lease will result in minimum annualized payments to us in the aggregate of $2.5 billion including $272.4 million for each of the next five years. These agreements provide for increases in the minimum revenue guarantees annually for increases in the Producer Price Index ("PPI") or the Federal Energy Regulatory Commission ("FERC") index, with certain contracts having provisions that limit the level of the rate increases.
	We have other cost reimbursement provisions in our throughput / storage agreements providing that customers (including HFC) reimburse us for certain costs. Such reimbursement receipts are recorded as revenue or deferred revenue depending on the nature of the cost. Deferred revenue is recognized over the remaining contractual term of the related throughput agreement.
	Taxes billed and collected from our pipeline and terminal customers are recorded on a net basis with no effect on net income.
	Environmental Costs
	Environmental costs are expensed if they relate to an existing condition caused by past operations and do not contribute to current or future revenue generation. Liabilities are recorded when site restoration and environmental remediation, cleanup and other obligations are either known or considered probable and can be reasonably estimated. Such estimates require judgment with respect to costs, time frame and extent of required remedial and clean-up activities and are subject to periodic adjustments based on currently available information. At December 31, 2014 and 2013, we had accrued liabilities, measured on an undiscounted basis, net of expected recoveries from indemnifying parties, for environmental remediation obligations of $5.2 million and $3.6 million respectively, of which $2.3 million and $0.4 million, respectively, were classified as other current liabilities.
	Under the Omnibus Agreement and certain transportation agreements and purchase agreements with HFC, HFC has agreed to indemnify us, subject to certain monetary and time limitations, for environmental noncompliance and remediation liabilities associated with certain assets transferred to us from HFC occurring or existing prior to the date of such transfers. We have an environmental agreement with Alon with respect to pre-closing environmental costs and liabilities relating to the pipelines and terminals acquired from Alon in 2005, under which Alon will indemnify us subject to certain monetary and time limitations. Environmental costs recoverable through insurance, indemnification agreements or other sources are included in other assets to the extent such recoveries are considered probable.
	Income Tax
	We are subject to the Texas margin tax that is based on our Texas sourced taxable margin. The tax is calculated by applying a tax rate to a base that considers both revenues and expenses and therefore has the characteristics of an income tax.
	We are organized as a pass-through entity for federal income tax purposes. As a result, our partners are responsible for federal income taxes based on their respective share of taxable income.
	Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax bases and financial reporting bases of assets and liabilities and the taxable income allocation requirements under the partnership agreement.
	Net Income per Limited Partners' Unit
	We use the two-class method when calculating the net income per unit applicable to limited partners, which is based on the weighted-average number of common and subordinated units outstanding during the year. Net income per unit applicable to limited partners is computed by dividing limited partners' interest in net income, after adjusting for the allocation of net income or loss attributable to previous owners ("Predecessor"), the allocation of net income or loss attributable to noncontrolling interests and the general partner's 2% interest and incentive distributions and other participating securities, by the weighted-average number of outstanding common, subordinated units and other dilutive securities. Other participating securities and dilutive securities are not significant.
	New Accounting Pronouncements
	Revenue Recognition
	In May 2014, an accounting standard update 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 is effective January 1, 2017, and we are evaluating the impact of this standard.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	Acquisitions
	2012 UNEV Acquisition
	On July 12, 2012, we acquired HFC's 75% interest in UNEV for consideration consisting of $260.0 million in cash and 2,059,800 of our common units. We paid an additional $0.9 million to HFC for a post-closing working capital adjustment. We also issued HFC a Class B unit comprising a noncontrolling equity interest in a wholly-owned subsidiary subject to redemption to the extent that HFC is entitled to a 50% interest in our share of annual UNEV earnings before interest, income taxes, depreciation, and amortization above $30 million beginning July 1, 2016, and ending in June 2032, subject to certain limitations. Such contingent redemption payments are limited to a maximum payment amount calculated as described below. However, to the extent earnings thresholds are not achieved, no redemption payments are required. Contemporaneously with this transaction, HFC (our general partner) agreed to forego its right to incentive distributions of up to $1.25 million per quarter over twelve consecutive quarterly periods and up to an additional four quarters in certain circumstances. The Class B unit increases with each foregone incentive distribution and by a 7% factor compounded annually on the outstanding unredeemed balance through its expiration date. At our option, we may redeem, in whole or in part, the Class B unit at the current unredeemed value based on the calculation described. The Class B unit had a carrying value of $26.8 million at December 31, 2014, and $20.1 million at December 31, 2013.
	Noncontrolling interests reported in the Consolidated Statements of Income include the minority partner's 25% interest in UNEV, foregone incentive distributions and the 7% accretion factor, which collectively amounted to $8.3 million at December 31, 2014, $6.6 million at December 31, 2013, and $1.2 million at December 31, 2012.
	We are a consolidated variable interest entity of HFC. Therefore, this transaction was recorded as a transfer between entities under common control and reflects HFC's carrying basis in UNEV's assets and liabilities. We have retrospectively adjusted our financial position and operating results as if UNEV were a consolidated subsidiary for all periods while we were under common control of HFC. Results of operations of UNEV prior to our acquisition on July 12, 2012, are herein referred to as operations attributable to the Predecessor. For the year ended December 31, 2012, our consolidated statement of income includes revenues from UNEV of $18.7 million and net losses of $7.2 million. Predecessor revenues for the year ended December 31, 2012, are $8.1 million and Predecessor net losses are $4.2 million. At December 31, 2014, UNEV had transportation agreements with shippers that provide minimum annualized revenues of $27.1 million, of which $18.4 million relates to a transportation agreement with HFC.

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Financial Instruments	Financial Instruments
	Our financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, debt and interest rate swaps. The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to the short-term maturity of these instruments. Debt consists of outstanding principal under our revolving credit agreement (which approximates fair value as interest rates are reset frequently at current interest rates) and our fixed interest rate senior notes.
	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 senior notes and interest rate swaps were as follows:
				December 31, 2014				December 31, 2013
	Financial Instrument		Fair Value Input Level	Carrying		Fair Value		Carrying		Fair Value
				Value				Value
				(In thousands)
	Assets:
	Interest rate swaps		Level 2	$	1,019	$	1,019	$	1,670	$	1,670
	Liabilities:
	Senior notes:
	6.5% Senior Notes		Level 2	$	296,579	$	291,000	$	295,927	$	313,500
	8.25% Senior Notes		Level 2	—		—		148,703		158,250
				296,579		291,000		444,630		471,750
	Interest rate swaps		Level 2	1,065		1,065		1,814		1,814
				$	297,644	$	292,065	$	446,444	$	473,564
	Level 2 Financial Instruments
	Our senior notes and interest rate swaps are measured at fair value using Level 2 inputs. The fair value of the senior notes is based on market values provided by a third-party bank, which were derived using market quotes for similar type debt instruments. The fair value of our interest rate swaps is based on the net present value of expected future cash flows related to both variable and fixed rate legs of the swap agreement. This measurement is computed using the forward London Interbank Offered Rate (“LIBOR”) yield curve, a market-based observable input.
	See Note 7 for additional information on these instruments.

Properties_and_Equipment

Properties and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Properties and Equipment	Properties and Equipment
	The carrying amounts of our properties and equipment are as follows:
		December 31,		December 31,
		2014		2013
		(In thousands)
	Pipelines, terminals and tankage	$	1,137,157	$	1,077,037
	Land and right of way	64,458		63,425
	Construction in progress	56,228		50,454
	Other	22,636		19,997
		1,280,479		1,210,913
	Less accumulated depreciation	300,000		253,099
		$	980,479	$	957,814
	We capitalized $1.5 million and $0.6 million in interest related to construction projects during the years ended December 31, 2014 and 2013, respectively.
	Depreciation expense was $54.7 million, $58.1 million, and $50.1 million for the years ended December 31, 2014, 2013 and 2012, respectively, and includes depreciation of assets acquired under capital leases. Asset abandonment charges of $1.9 million, $6.2 million and $4.8 million for assets permanently removed from service were included in depreciation expense for the years ended December 31, 2014, 2013 and 2012, respectively.

Transportation_Agreements

Transportation Agreements	12 Months Ended
	Dec. 31, 2014
Finite-Lived Intangible Assets, Gross [Abstract]
Transportation Agreements	Transportation Agreements
	Our transportation agreements represent a portion of the total purchase price of certain assets acquired from Alon in 2005 and from HFC in 2008. The Alon agreement is being amortized over 30 years ending 2035 (the initial 15-year term of the agreement plus an expected 15-year extension period) and the HFC agreement is being amortized over 15 years ending 2023 (the term of the HFC agreement).
	The carrying amounts of our transportation agreements are as follows:
		December 31,		December 31,
		2014		2013
		(In thousands)
	Alon transportation agreement	$	59,933	$	59,933
	HFC transportation agreement	74,231		74,231
		134,164		134,164
	Less accumulated amortization	53,461		46,514
		$	80,703	$	87,650
	Amortization expense was $6.9 million for each of the years ended December 31, 2014, 2013 and 2012, respectively.
	We have additional transportation agreements with HFC resulting from historical transactions consisting of pipeline, terminal and tankage assets contributed to us or acquired from HFC. These transactions occurred while we were a consolidated variable interest entity of HFC; therefore, our basis in these agreements is zero and does not reflect a step-up in basis to fair value.

Employees_Retirement_and_Incen

Employees, Retirement and Incentive Plans	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employees, Retirement and Incentive Plans	Employees, Retirement and Incentive Plans
	Direct support for our operations is provided by Holly Logistic Services, L.L.C., an HFC subsidiary, which utilizes personnel employed by HFC who are dedicated to performing services for us. Their costs, including salaries, bonuses, payroll taxes, benefits and other direct costs, are charged to us monthly in accordance with an omnibus agreement that we have with HFC. These employees participate in the retirement and benefit plans of HFC. Our share of retirement and benefit plan costs was $7.4 million, $7.4 million and $6.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. These costs include retirement costs of $4.4 million, $5.0 million and $4.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	We have an incentive plan (“Long-Term Incentive Plan”) for employees and non-employee directors who perform services for us. The Long-Term Incentive Plan consists of four components: restricted or phantom units, performance units, unit options and unit appreciation rights. Our accounting policy for the recognition of compensation expense for awards with pro-rata vesting (a significant proportion of our awards) is to expense the costs ratably over the vesting periods.
	As of December 31, 2014, we have three types of incentive-based awards which are described below. The compensation cost charged against income was $3.5 million, $3.6 million and $2.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. We currently purchase units in the open market instead of issuing new units for settlement of all unit awards under our Long-Term Incentive Plan. As of December 31, 2014, 2,500,000 units were authorized to be granted under our Long-Term Incentive Plan, of which 1,530,748 have not yet been granted, assuming no forfeitures of the unvested units and full achievement of goals for the performance units already granted.
	Restricted and Phantom Units
	Under our Long-Term Incentive Plan, we grant restricted units to non-employee directors and selected employees who perform services for us, with most awards vesting over a period of one to three years. Although full ownership of the units does not transfer to the recipients until the units vest, the recipients have distribution and voting rights on these units from the date of grant.
	In addition, we grant phantom units to certain employees, which vest over a period of one year. Vested units are paid in common units. Full ownership of the units does not transfer to the recipient until the units vest, and the recipients do not have voting or distribution rights on these units until they vest.
	The fair value of each restricted unit and phantom unit award is measured at the market price as of the date of grant and is amortized over the vesting period.
	A summary of restricted unit and phantom unit activity and changes during the year ended December 31, 2014, is presented below:
	Restricted and Phantom Units	Units		Weighted-
				Average
				Grant-Date
				Fair Value
	Outstanding at January 1, 2014 (nonvested)	122,951		$	33.36
	Granted	91,852		33.49
	Vesting and transfer of full ownership to recipients	(80,645	)	33.22
	Forfeited	(8,081	)	35.28
	Outstanding at December 31, 2014 (nonvested)	126,077		$	33.43
	The fair values of restricted and phantom units that were vested and transferred to recipients during the years ended December 31, 2014, 2013 and 2012 were $2.7 million, $1.2 million and $2.4 million respectively. As of December 31, 2014, there was $3.0 million of total unrecognized compensation expense related to nonvested restricted unit and phantom unit grants, which is expected to be recognized over a weighted-average period of 1.5 years. For the years ended December 31, 2013 and 2012, the grant date closing unit price applied to the number of restricted units and phantom units ultimately awarded was $34.66 and $31.01 respectively.
	Performance Units
	Under our Long-Term Incentive Plan, we grant performance units to selected executives who perform services for us. Performance units granted are payable based upon the growth in our distributable cash flow per common unit over the performance period, and vest over a period of three years.
	We granted 13,967 target performance units to certain officers in October 2014. These units will vest over a three year period ending December 31, 2017. The performance units granted are payable in HEP common units. The number of units actually earned will be based on the growth of our distributable cash flow per common unit over the performance period, and can range from 50% to 150% of the target number of performance units granted. Although common units are not transferred to the recipients until the performance units vest, the recipients have distribution rights with respect to the common units from the date of grant. The fair value of these performance units is based on the grant date closing unit price of $33.57 for the performance units granted in October 2014 and will apply to the number of units ultimately awarded. For the years ended December 31, 2013 and 2012, the weighted average grant date closing unit price applied to the number of units awarded was $37.90 and $30.61 respectively.
	A summary of performance unit activity and changes during the twelve months ended December 31, 2014, is presented below:
	Performance Units	Units
	Outstanding at January 1, 2014 (nonvested)	75,216
	Granted	13,967
	Vesting and transfer of common units to recipients	(17,938	)
	Outstanding at December 31, 2014 (nonvested)	71,245
	The grant date fair value of performance units vested and transferred to recipients was $0.5 million during each of the three years ended December 31, 2014, 2013 and 2012. Based on the weighted average fair value of performance units outstanding at December 31, 2014, of $2.6 million, there was $1.1 million of total unrecognized compensation expense related to nonvested performance units, which is expected to be recognized over a weighted-average period of 1.2 years.
	During the year ended December 31, 2014, we paid $3.6 million for the purchase of our common units in the open market for the issuance and settlement of all unit awards under our Long-Term Incentive Plan.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Instruments [Abstract]
Debt	Debt
	Credit Agreement
	We have a $650 million senior secured revolving credit facility expiring in November 2018 (the “Credit Agreement”) that 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.
	Our obligations under the Credit Agreement are collateralized by substantially all of our assets. Indebtedness under the Credit Agreement is recourse to HEP Logistics Holdings, L.P. (“HEP Logistics”), our general partner, and is guaranteed by our material wholly-owned subsidiaries. Any recourse to HEP Logistics would be limited to the extent of its assets, which other than its investment in us, are not significant. We may prepay all loans at any time without penalty, except for payment of certain breakage and related costs.
	Indebtedness under the Credit Agreement bears interest, at our option, at either (a) the reference rate as announced by the administrative agent plus an applicable margin (ranging from 0.625% to 1.50%) or (b) at a rate equal to LIBOR plus an applicable margin (ranging from 1.625% to 2.50%). In each case, the applicable margin is based upon the ratio of our funded debt (as defined in the Credit Agreement) to EBITDA (earnings before interest, taxes, depreciation and amortization, as defined in the Credit Agreement). The weighted-average interest rates on our Credit Agreement borrowings in effect at December 31, 2014 and 2013, were 2.152% and 2.163%, respectively. We incur a commitment fee on the unused portion of the Credit Agreement at an annual rate ranging from 0.30% to 0.45% based upon the ratio of our funded debt to EBITDA for the four most recently completed fiscal quarters.
	The Credit Agreement imposes certain requirements on us with which we are currently in compliance, including: a prohibition against distribution to unitholders if, before or after the distribution, a potential default or an event of default as defined in the agreement would occur; limitations on our ability to incur debt, make loans, acquire other companies, change the nature of our business, enter into a merger or consolidation, or sell assets; and covenants that require maintenance of a specified EBITDA to interest expense ratio, total debt to EBITDA ratio and senior debt to EBITDA ratio. If an event of default exists under the Credit Agreement, the lenders will be able to accelerate the maturity of the debt and exercise other rights and remedies.
	Senior Notes
	In March 2012, we issued $300 million in aggregate principal amount outstanding of 6.5% Senior Notes maturing March 2020. Net proceeds of $294.8 million were used in March and April 2012 to redeem $185.0 million aggregate principal amount of our 6.25% Senior Notes maturing March 1, 2015, tendered pursuant to a cash tender offer and consent solicitation, to repay $72.9 million in promissory notes related to our November 2011 acquisition of assets located at HFC's El Dorado and Cheyenne refineries, to pay related fees, expenses and accrued interest in connection with these transactions and to repay borrowings under the Credit Agreement. We recognized a charge of $3.0 million upon the early extinguishment of our 6.25% Senior Notes for the year ended December 31, 2012. This charge represents the premium paid to our 6.25% Senior Note holders upon their tender of an aggregate principal amount of $185.0 million and related net discount.
	In March 2014, we redeemed the $150 million aggregate principal amount of 8.25% Senior Notes maturing March 2018 at a redemption cost of $156.2 million, at which time we 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. We funded the redemption with borrowings under our Credit Agreement.
	The 6.5% Senior Notes are unsecured and impose certain restrictive covenants, with which we are currently in compliance, including limitations on our 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 6.5% Senior Notes are rated investment grade by both Moody’s and Standard & Poor’s and no default or event of default exists, we will not be subject to many of the foregoing covenants. Additionally, we have certain redemption rights at varying premiums over face value under the 6.5% Senior Notes.
	Indebtedness under the 6.5% Senior Notes is recourse to HEP Logistics, our general partner, and is guaranteed by our material, wholly-owned subsidiaries. However, any recourse to HEP Logistics would be limited to the extent of its assets, which other than its investment in us, are not significant.
	Our purchase and contribution agreements with HFC with respect to the intermediate pipelines acquired in 2005 and the crude pipelines and tankage assets acquired in 2008, restrict us from selling these pipelines and terminals acquired from HFC. Under these agreements, we are restricted from prepaying borrowings and long-term debt to outstanding balances below $206 million prior to 2015 and $171 million prior to 2018, subject to certain limited exceptions.
	Long-term Debt
	The carrying amounts of our long-term debt are as follows:
		December 31,				December 31,
		2014				2013
		(In thousands)
	Credit Agreement	$	571,000			$	363,000
	6.5% Senior Notes
	Principal	300,000				300,000
	Unamortized discount	(3,421		)		(4,073		)
		296,579				295,927
	8.25% Senior Notes
	Principal	—				150,000
	Unamortized discount	—				(1,297		)
		—				148,703
	Total long-term debt	$	867,579			$	807,630
	Maturities of our long-term debt are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	—
	2016	—
	2017	—
	2018	571,000
	2019	—
	Thereafter	300,000
	Total	$	871,000
	Interest Rate Risk Management
	We use interest rate swaps (derivative instruments) to manage our exposure to interest rate risk.
	As of December 31, 2014, we have three interest rate swaps that hedge our exposure to the cash flow risk caused by the effects of LIBOR changes on $305 million of Credit Agreement advances. Our first interest rate swap effectively converts $155 million of our LIBOR based debt to fixed rate debt having an interest rate of 0.99% plus an applicable margin of 2.00% as of December 31, 2014, which equaled an effective interest rate of 2.99%. This swap contract matures in February 2016. We also have two additional interest rate swaps with identical terms which effectively convert $150 million of our LIBOR based debt to fixed rate debt having an interest rate of 0.74% plus an applicable margin of 2.00% as of December 31, 2014, which equaled an effective interest rate of 2.74%. Both of these swap contracts mature in July 2017.
	We have designated these interest rate swaps as cash flow hedges. Based on our assessment of effectiveness using the change in variable cash flows method, we have determined that these interest rate swaps are effective in offsetting the variability in interest payments on $305 million of our variable rate debt resulting from changes in LIBOR. Under hedge accounting, we adjust our cash flow hedges on a quarterly basis to their fair values with the offsetting fair value adjustments to accumulated other comprehensive income (loss). Also on a quarterly basis, we measure hedge effectiveness by comparing the present value of the cumulative change in the expected future interest to be paid or received on the variable leg of our swaps against the expected future interest payments on $305 million of our variable rate debt. Any ineffectiveness is recorded directly to interest expense. As of December 31, 2014, we had no ineffectiveness on our cash flow hedges.
	Prior to entering into our first swap contract (discussed above), we terminated our previous interest rate swap that prior to settlement also served to hedge our exposure to the effects of LIBOR changes on the same $155 million Credit Agreement advance. We terminated this swap at a cost of $6 million, to lock in a lower effective interest rate on this $155 million advance, which by means of the previous swap contract was effectively fixed at 6.24% at the time of termination. This cost of terminating the swap was amortized as a charge to interest expense through February 2013, the remaining term of the terminated swap contract.
	At December 31, 2014, we have accumulated other comprehensive loss of $46,000 that relates to our current cash flow hedging instruments. Approximately $0.5 million will be transferred from accumulated other comprehensive loss into interest expense as interest is paid on the underlying swap agreement over the next twelve-month period, assuming interest rates remain unchanged.
	Additional information on our interest rate swaps is as follows:
	Derivative Instrument	Balance Sheet Location		Fair Value				Location of Offsetting Balance	Offsetting
									Amount
		(In thousands)
	December 31, 2014
	Interest rate swaps designated as cash flow hedging instrument:
	Variable-to-fixed interest rate swap contract ($155 million of LIBOR based debt interest)	Other long-term		$	(1,065	)		Accumulated other	$	(1,065	)
		liabilities						comprehensive loss
	Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other long-term assets		1,019				Accumulated other	1,019
								comprehensive income
				$	(46	)			$	(46	)
	December 31, 2013
	Interest rate swaps designated as cash flow hedging instrument:
	Variable-to-fixed interest rate swap contract ($155 million of LIBOR based debt interest)	Other long-term		$	(1,814	)		Accumulated other	$	(1,814	)
		liabilities						comprehensive loss
	Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other long-term assets		1,670				Accumulated other	1,670
								comprehensive income
				$	(144	)			$	(144	)
	Interest Expense and Other Debt Information
	Interest expense consists of the following components:
		Years Ended December 31,
		2014				2013			2012
	(In thousands)
Interest on outstanding debt:
Credit Agreement, net of interest on interest rate swaps	$	13,350			$	11,961		$	8,736
6.5% Senior Notes	19,446				19,506			15,716
6.25% Senior Notes	—				—			2,422
8.25% Senior Notes	2,544				12,380			12,380
Promissory Notes	—				—			543
Amortization of discount and deferred debt issuance costs	1,821				2,120			1,946
Amortization of unrecognized loss attributable to terminated cash flow hedge	—				849			5,095
Commitment fees	450				835			621
Total interest incurred	37,611				47,651			47,459
Less capitalized interest	1,510				641			277
Net interest expense	$	36,101			$	47,010		$	47,182
Cash paid for interest	$	39,414			$	44,655		$	38,476

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	We lease certain facilities, pipelines and rights of way under operating leases, most of which contain renewal options. The right of way agreements have various termination dates through 2053.
	As of December 31, 2014, the minimum future rental commitments under operating leases having non-cancelable lease terms in excess of one year are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	6,928
	2016	6,913
	2017	3,549
	2018	192
	2019	124
	Thereafter	266
	Total	$	17,972
	Rental expense charged to operations was $8.0 million, $8.3 million and $8.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	We also have other long-term contractual obligations primarily consisting of long-term site service agreements with HFC, expiring in 2024 through 2026, for the provision of certain facility services and utility costs that relate to our assets located at HFC’s refinery facilities. At December 31, 2014, these minimum future contractual obligations having terms in excess of one year are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	1,067
	2016	1,067
	2017	1,067
	2018	1,067
	2019	1,032
	Thereafter	6,294
	Total	$	11,594
	We are a party to various legal and regulatory proceedings, none of which we believe will have a material adverse impact on our financial condition, results of operations or cash flows.

Significant_Customers

Significant Customers	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Significant Customers	Significant Customers
	All revenues are domestic revenues, of which 93% are currently generated from our two largest customers: HFC and Alon. The vast majority of our revenues are derived from activities conducted in the southwest United States.
	The following table presents the percentage of total revenues generated by each of these customers:
		Years Ended December 31,
		2014		2013		2012
	HFC	83	%	83	%	84	%
	Alon	10	%	11	%	11	%

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	We serve HFC's refineries under long-term pipeline and terminal, tankage and throughput agreements expiring from 2019 to 2026. Under these agreements, HFC agrees to transport, store and throughput volumes of refined product and crude oil on our pipelines and terminal, tankage and loading rack facilities that result in minimum annual payments to us. These minimum annual payments or revenues are subject to annual tariff rate adjustments on July 1st each year based on the Producer Price Index (“PPI”) or Federal Energy Regulatory Commission (“FERC”) index. As of December 31, 2014, these agreements with HFC will result in minimum payments to us of $231.6 million.
	If HFC fails to meet its minimum volume commitments under the agreements in any quarter, it will be required to pay us the amount of any shortfall in cash by the last day of the month following the end of the quarter. Under certain of these agreements, a shortfall payment may be applied as a credit in the following four quarters after its minimum obligations are met.
	Under certain provisions of an omnibus agreement we have with HFC (the “Omnibus Agreement”), we pay HFC an annual administrative fee ($2.3 million in 2014 and currently $2.4 million) for the provision by HFC or its affiliates of various general and administrative services to us. This fee does not include the salaries of personnel employed by HFC who perform services for us on behalf of HLS or the cost of their employee benefits, which are charged to us separately by HFC. Also, we reimburse HFC and its affiliates for direct expenses they incur on our behalf.
	Related party transactions with HFC are as follows:
	•	Revenues received from HFC were $275.2 million, $252.4 million and $245.6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	•	HFC charged us general and administrative services under the Omnibus Agreement of $2.3 million for each of the years ended December 31, 2014, 2013 and 2012.
	•	We reimbursed HFC for costs of employees supporting our operations of $38.9 million, $34.6 million and $31.1 million for the years ended December 31, 2014, 2013 and 2012, respectively. Netted against the cost of employees for the year ended December 31, 2013, is a $3.5 million refund from HFC related to refunds of taxes covering a multi-year period.
	•	HFC reimbursed us $16.8 million, $21.6 million and $13.4 million for the years ended December 31, 2014, 2013 and 2012, respectively, for certain reimbursable costs and capital projects.
	•	We distributed $80.5 million, $71.4 million and $64.0 million, for the years ended December 31, 2014, 2013 and 2012, respectively, to HFC as regular distributions on its common units and general partner interest, including general partner incentive distributions.
	•	Accounts receivable from HFC were $33.4 million and $29.7 million at December 31, 2014 and 2013, respectively.
	•	Accounts payable to HFC were $5.2 million and $8.5 million at December 31, 2014 and 2013, respectively.
	•	Revenues for the years ended December 31, 2014, 2013 and 2012 include $10.1 million, $5.1 million and $7.8 million, respectively, of shortfall payments billed in 2013, 2012 and 2011, respectively, as HFC did not exceed its minimum volume commitment in any of the subsequent four quarters in 2014, 2013 and 2012. Deferred revenue in the consolidated balance sheets at December 31, 2014 and 2013, includes $7.3 million and $10.1 million, respectively, relating to certain shortfall billings. It is possible that HFC may not exceed its minimum obligations to receive credit for any of the $7.3 million deferred at December 31, 2014.
	•	We acquired from HFC a 75% interest in the UNEV Pipeline in July 2012. See Note 2 for a description of this transaction.

Partners_Equity_Income_Allocat

Partners' Equity, Income Allocations and Cash Distributions	12 Months Ended
	Dec. 31, 2014
Partners' Capital [Abstract]
Partners' Equity, Income Allocations and Cash Distributions	Partners’ Equity, Income Allocations and Cash Distributions
	As of December 31, 2014, HFC held 22,380,030 of our common units and the 2% general partner interest, which together constituted a 39% ownership interest in us.
	On January 16, 2013, a two-for-one unit split was paid in the form of a common unit distribution for each issued and outstanding common unit to all unitholders of record on January 7, 2013. All references to unit and per unit amounts in this document and related disclosures have been adjusted to reflect the effect of the unit split for all prior periods presented.
	Common Unit Issuances
	2013 Issuances
	In March 2013, we closed on a public offering of 1,875,000 of our common units. Additionally, an affiliate of HFC, as a selling unitholder, closed on a public sale of 1,875,000 of its HEP common units for which we did not receive any proceeds. We used our net proceeds of $73.4 million to repay indebtedness incurred under our credit facility and for general partnership purposes.
	2012 Issuances
	On July 12, 2012, we issued HFC 2,059,800 of our common units as partial consideration for our acquisition of its 75% interest in UNEV.
	We received aggregate capital contributions of $1.7 million from our general partner to maintain its 2% general partner interest concurrent with the 2012 common unit issuance described above.
	Under our registration statement filed with the SEC using a “shelf” registration process, $2.0 billion of securities have been registered. Any potential sale of such securities, through one or more prospectus supplements, would describe, among other things, the specific amounts, prices and terms of any securities offered and how the proceeds would be used. Any proceeds from the sale of securities would be used for general business purposes, which may include, among other things, funding acquisitions of assets or businesses, working capital, capital expenditures, investments in subsidiaries, the retirement of existing debt and/or the repurchase of common units or other securities.
	Allocations of Net Income
	Net income attributable to HEP is allocated between limited partners and the general partner interest in accordance with the provisions of the partnership agreement. HEP net income allocated to the general partner includes incentive distributions that are declared subsequent to quarter end. After the amount of incentive distributions is allocated to the general partner, the remaining net income attributable to HEP is allocated to the partners based on their weighted-average ownership percentage during the period.
	The following table presents the allocation of the general partner interest in net income for the periods presented below:
		Years Ended December 31,
		2014			2013		2012
		(in thousands)
	General partner interest in net income	$	1,446		$	1,059	$	1,464
	General partner incentive distribution	33,221			26,464		20,986
	Total general partner interest in net income	$	34,667		$	27,523	$	22,450
	Cash Distributions
	We consider regular cash distributions to unitholders on a quarterly basis, although there is no assurance as to the future cash distributions since they are dependent upon future earnings, cash flows, capital requirements, financial condition and other factors.
	Within 45 days after the end of each quarter, we distribute all of our available cash (as defined in our partnership agreement) to unitholders of record on the applicable record date. The amount of available cash generally is all cash on hand at the end of the quarter; less the amount of cash reserves established by our general partner to provide for the proper conduct of our business, comply with applicable laws, any of our debt instruments, or other agreements; or provide funds for distributions to our unitholders and to our general partner for any one or more of the next four quarters; plus all cash on hand on the date of determination of available cash for the quarter resulting from working capital borrowings made after the end of the quarter.
	We make distributions in the following manner: 98% to our common unitholders, pro rata, and 2% to the general partner, until we distribute for each outstanding common unit an amount equal to the minimum quarterly distribution for that quarter and any arrearages in payment of the minimum quarterly distributions for any prior quarters, thereafter. Cash in excess of the minimum quarterly distributions is distributed to the unitholders and the general partner based on certain percentages presented below.
	Our general partner, HEP Logistics, is entitled to incentive distributions if the amount we distribute with respect to any quarter exceeds specified target levels.
		Total Quarterly Distribution		Marginal Percentage Interest in Distributions
		Target Amount		Unitholders	General Partner
	Minimum quarterly distribution	$0.25		98%	2%
	First target distribution	Up to $0.275		98%	2%
	Second target distribution	above $0.275 up to $0.3125		85%	15%
	Third target distribution	above $0.3125 up to $0.375		75%	25%
	Thereafter	Above $0.375		50%	50%
	On January 22, 2015, we announced our cash distribution for the fourth quarter of 2014 of $0.53 per unit. The distribution is payable on all common and general partner units and was paid February 13, 2015, to all unitholders of record on February 2, 2015.
	The following table presents the allocation of our regular quarterly cash distributions to the general and limited partners for the periods in which they apply. Our distributions are declared subsequent to quarter end; therefore, the amounts presented do not reflect distributions paid during the periods presented below.
		Years Ended December 31,
		2014			2013		2012
		(In thousands, except per unit data)
	General partner interest in distribution	$	3,264		$	2,982	$	2,566
	General partner incentive distribution	33,221			26,464		20,986
	Total general partner distribution	36,485			29,446		23,552
	Limited partner distribution	121,714			114,675		102,222
	Total regular quarterly cash distribution	$	158,199		$	144,121	$	125,774
	Cash distribution per unit applicable to limited partners	$	2.075		$	1.955	$	1.835
	As a master limited partnership, we distribute our available cash, which historically has exceeded our net income attributable to HEP because depreciation and amortization expense represents a non-cash charge against income. The result is a decline in our partners’ equity since our regular quarterly distributions have exceeded our quarterly net income attributable to HEP. Additionally, if the asset contributions and acquisitions from HFC had occurred while we were not a consolidated variable interest entity of HFC, our acquisition cost, in excess of HFC’s historical basis in the transferred assets would have been recorded in our financial statements at the time of acquisition, as increases to our properties and equipment and intangible assets instead of decreases to our partners’ equity.

Quarterly_Financial_Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Quarterly Financial Information	Quarterly Financial Data (Unaudited)
	Summarized quarterly financial data is as follows:
		First		Second		Third		Fourth		Total
		(In thousands, except per unit data)
	Year Ended December 31, 2014
	Revenues	$	87,004	$	74,998	$	82,130	$	88,413	$	332,545
	Operating income	$	45,453	$	32,033	$	38,925	$	38,343	$	154,754
	Income before income taxes	$	27,855	$	24,478	$	31,231	$	30,484	$	114,048
	Net income	$	27,780	$	24,450	$	31,189	$	30,394	$	113,813
	Net income attributable to Holly Energy Partners	$	24,143	$	23,034	$	29,680	$	28,668	$	105,525
	Limited partners’ per unit interest in net income – basic and diluted	$	0.27	$	0.25	$	0.35	$	0.33	$	1.2
	Distributions per limited partner unit	$	0.508	$	0.515	$	0.523	$	0.53	$	2.075
	Year Ended December 31, 2013
	Revenues	$	74,298	$	75,285	$	77,723	$	77,876	$	305,182
	Operating income	$	31,047	$	32,520	$	34,173	$	30,826	$	128,566
	Income before income taxes	$	21,345	$	21,641	$	23,097	$	20,331	$	86,414
	Net income	$	21,289	$	21,297	$	23,057	$	20,438	$	86,081
	Net income attributable to Holly Energy Partners	$	18,399	$	20,167	$	21,885	$	18,998	$	79,449
	Limited partners’ per unit interest in net income – basic and diluted	$	0.21	$	0.23	$	0.25	$	0.19	$	0.88
	Distributions per limited partner unit	$	0.478	$	0.485	$	0.493	$	0.5	$	1.955

Supplemental_Guarantor_NonGuar

Supplemental Guarantor / Non-Guarantor Financial Information	12 Months Ended
	Dec. 31, 2014
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Supplemental Guarantor / Non-Guarantor Financial Information
		Supplemental Guarantor/Non-Guarantor Financial Information
	Obligations of HEP (“Parent”) under the Senior Notes have been jointly and severally guaranteed by each of its direct and indirect 100% owned subsidiaries (“Guarantor Subsidiaries”). These guarantees are full and unconditional, subject to certain customary release provisions. These circumstances include (i) when a Guarantor Subsidiary is sold or sells all or substantially all of its assets, (ii) when a Guarantor Subsidiary is declared “unrestricted” for covenant purposes, (iii) when a Guarantor Subsidiary's guarantee of other indebtedness is terminated or released and (iv) when the requirements for legal defeasance or covenant defeasance or to discharge the Senior Notes have been satisfied.
	The following financial information presents condensed consolidating balance sheets, statements of comprehensive income, and statements of cash flows of the Parent, the Guarantor Subsidiaries and the Non-Guarantor subsidiaries. The information has been presented as if the Parent accounted for its ownership in the Guarantor Subsidiaries and the Guarantor Restricted Subsidiaries accounted for the ownership of the Non-Guarantor Non-Restricted Subsidiaries, using the equity method of accounting.
	Condensed Consolidating Balance Sheet
	December 31, 2014		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
						Restricted Subsidiaries
			(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents		$	2		$	2,828		$	—		$	—		$	2,830
	Accounts receivable		—			34,274			6,044			(189		)	40,129
	Prepaid and other current assets		212			2,856			1,315			—			4,383
	Total current assets		214			39,958			7,359			(189		)	47,342
	Properties and equipment, net		—			596,988			383,491			—			980,479
	Investment in subsidiaries		622,100			285,247			—			(907,347		)	—
	Transportation agreements, net		—			80,703			—			—			80,703
	Goodwill		—			256,498			—			—			256,498
	Investment in SLC Pipeline		—			24,478			—			—			24,478
	Other assets		1,319			10,736			—			—			12,055
	Total assets		$	623,633		$	1,294,608		$	390,850		$	(907,536	)	$	1,401,555
	LIABILITIES AND PARTNERS’ EQUITY
	Current liabilities:
	Accounts payable		$	—		$	15,495		$	2,575		$	(189	)	$	17,881
	Accrued interest		6,500			115			—			—			6,615
	Deferred revenue		—			5,672			6,760			—			12,432
	Accrued property taxes		—			1,902			801			—			2,703
	Other current liabilities		45			4,408			118			—			4,571
	Total current liabilities		6,545			27,592			10,254			(189		)	44,202
	Long-term debt		296,579			571,000			—			—			867,579
	Other long-term liabilities		147			17,731			267			—			18,145
	Deferred revenue		—			29,392			—			—			29,392
	Class B unit		—			26,793			—			—			26,793
	Equity - partners		320,362			622,100			380,329			(1,002,429		)	320,362
	Equity - noncontrolling interest		—			—			—			95,082			95,082
	Total liabilities and partners’ equity		$	623,633		$	1,294,608		$	390,850		$	(907,536	)	$	1,401,555
	Condensed Consolidating Balance Sheet
	December 31, 2013		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
						Restricted Subsidiaries
			(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents		$	2		$	1,447		$	4,903		$	—		$	6,352
	Accounts receivable		—			31,107			4,543			(914		)	34,736
	Intercompany accounts receivable		—			62,516			—			(62,516		)	—
	Prepaid and other current assets		234			2,590			1,050			—			3,874
	Total current assets		236			97,660			10,496			(63,430		)	44,962
	Properties and equipment, net		—			564,847			392,967			—			957,814
	Investment in subsidiaries		885,598			292,464			—			(1,178,062		)	—
	Transportation agreements, net		—			87,650			—			—			87,650
	Goodwill		—			256,498			—			—			256,498
	Investment in SLC Pipeline		—			24,741			—			—			24,741
	Other assets		1,684			9,159			—			—			10,843
	Total assets		$	887,518		$	1,333,019		$	403,463		$	(1,241,492	)	$	1,382,508
	LIABILITIES AND PARTNERS’ EQUITY
	Current liabilities:
	Accounts payable		$	—		$	18,966		$	4,846		$	(914	)	$	22,898
	Intercompany accounts payable		62,516			—			—			(62,516		)	—
	Accrued interest		10,198			41			—			—			10,239
	Deferred revenue		—			6,406			7,575			—			13,981
	Accrued property taxes		—			1,661			942			—			2,603
	Other current liabilities		629			1,216			—			—			1,845
	Total current liabilities		73,343			28,290			13,363			(63,430		)	51,566
	Long-term debt		444,630			363,000			—			—			807,630
Other long-term liabilities		99			14,338			148			—			14,585
Deferred revenue		—			21,669			—			—			21,669
Class B unit		—			20,124			—			—			20,124
Equity - partners		369,446			885,598			389,952			(1,275,550		)	369,446
Equity - noncontrolling interest		—			—			—			97,488			97,488
Total liabilities and partners’ equity		$	887,518		$	1,333,019		$	403,463		$	(1,241,492	)	$	1,382,508
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2014		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Revenues:
Affiliates		$	—		$	254,364		$	22,073		$	(1,241	)	$	275,196
Third parties		—			45,711			11,638			—			57,349
		—			300,075			33,711			(1,241		)	332,545
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)		—			93,382			12,660			(1,241		)	104,801
Depreciation and amortization		—			47,592			14,574			—			62,166
General and administrative		2,658			8,166			—			—			10,824
		2,658			149,140			27,234			(1,241		)	177,791
Operating income (loss)		(2,658		)	150,935			6,477			—			154,754
Equity in earnings of subsidiaries		138,691			4,858			—			(143,549		)	—
Equity in earnings of SLC Pipeline		—			2,987			—			—			2,987
Interest income		—			3			—			—			3
Interest expense		(22,831		)	(13,270		)	—			—			(36,101		)
Loss on early extinguishment of debt		(7,677		)	—			—			—			(7,677		)
Other		—			82			—			—			82
		108,183			(5,340		)	—			(143,549		)	(40,706		)
Income (loss) before income taxes		105,525			145,595			6,477			(143,549		)	114,048
State income tax expense		—			(235		)	—			—			(235		)
Net income (loss)		105,525			145,360			6,477			(143,549		)	113,813
Allocation of net (income) attributable to noncontrolling interests		—			—			—			(8,288		)	(8,288		)
Net income (loss) attributable to Holly Energy Partners		105,525			145,360			6,477			(151,837		)	105,525
Other comprehensive (loss)		98			98			—			(98		)	98
Comprehensive income (loss)		$	105,623		$	145,458		$	6,477		$	(151,935	)	$	105,623
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2013		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Revenues:
Affiliates		$	—		$	236,336		$	17,258		$	(1,226	)	$	252,368
Third parties		—			42,139			10,675			—			52,814
		—			278,475			27,933			(1,226		)	305,182
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)		—			88,614			12,056			(1,226		)	99,444
Depreciation and amortization		—			51,082			14,341			—			65,423
General and administrative		3,381			8,368			—			—			11,749
		3,381			148,064			26,397			(1,226		)	176,616
Operating income (loss)		(3,381		)	130,411			1,536			—			128,566
Equity in earnings of subsidiaries		115,850			1,231			—			(117,081		)	—
Equity in earnings of SLC Pipeline		—			2,826			—			—			2,826
Interest income		—			56			105			—			161
Interest expense		(33,020		)	(13,990		)	—			—			(47,010		)
Gain on sale of assets		—			1,810			—			—			1,810
Other		—			61			—			—			61
		82,830			(8,006		)	105			(117,081		)	(42,152		)
Income (loss) before income taxes		79,449			122,405			1,641			(117,081		)	86,414
State income tax expense		—			(333		)	—			—			(333		)
Net income (loss)		79,449			122,072			1,641			(117,081		)	86,081
Allocation of net loss attributable to noncontrolling interests		—			—			—			(6,632		)	(6,632		)
Net income (loss) attributable to Holly Energy Partners		79,449			122,072			1,641			(123,713		)	79,449
Other comprehensive income		4,135			4,135			—			(4,135		)	4,135
Comprehensive income (loss)		$	83,584		$	126,207		$	1,641		$	(127,848	)	$	83,584
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2012		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Revenues:
Affiliates		$	—		$	232,986		$	13,754		$	(1,158	)	$	245,582
Third parties		—			41,984			4,994			—			46,978
		—			274,970			18,748			(1,158		)	292,560
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)		—			78,766			11,634			(1,158		)	89,242
Depreciation and amortization		—			43,147			14,314			—			57,461
General and administrative		3,336			4,258			—			—			7,594
		3,336			126,171			25,948			(1,158		)	154,297
Operating income (loss)		(3,336		)	148,799			(7,200		)	—			138,263
Equity in earnings (loss) of subsidiaries		130,743			(5,400		)	—			(125,343		)	—
Equity in earnings of SLC Pipeline		—			3,364			—			—			3,364
Interest expense		(31,523		)	(15,659		)	—			—			(47,182		)
Loss on early extinguishment of debt		(2,979		)	—			—			—			(2,979		)
Other		—			10			—			—			10
		96,241			(17,685		)	—			(125,343		)	(46,787		)
Income (loss) before income taxes		92,905			131,114			(7,200		)	(125,343		)	91,476
State income tax expense		—			(371		)	—			—			(371		)
Net income (loss)		92,905			130,743			(7,200		)	(125,343		)	91,105
Allocation of net loss attributable to Predecessors		4,200			—			—			—			4,200
Allocation of net loss attributable to noncontrolling interests		(2,953		)	—			—			1,800			(1,153		)
Net income (loss) attributable to Holly Energy Partners		94,152			130,743			(7,200		)	(123,543		)	94,152
Other comprehensive (loss)		2,185			2,185			—			(2,185		)	2,185
Comprehensive income (loss)		$	96,337		$	132,928		$	(7,200	)	$	(125,728	)	$	96,337
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2014		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Cash flows from operating activities		$	(25,339	)	$	193,273		$	19,398		$	(692	)	$	186,640
Cash flows from investing activities
Additions to properties and equipment		—			(71,758		)	(8,201		)	—			(79,959		)
Distributions from UNEV		—			11,383			—			(11,383		)	—
Distributions in excess of equity in earnings in SLC Pipeline		—			263			—			—			263
		—			(60,112		)	(8,201		)	(11,383		)	(79,696		)
Cash flows from financing activities
Net borrowings under credit agreement		—			208,000			—			—			208,000
Net intercompany financing activities		339,771			(339,771		)	—			—			—
Repayments of senior notes		(156,188		)	—			—			—			(156,188		)
Distributions to HEP unitholders		(154,670		)	—			—			—			(154,670		)
Distributions to noncontrolling interests		—			—			(16,100		)	12,075			(4,025		)
Purchase of units for incentive grants		(3,577		)	—			—			—			(3,577		)
Other		3			(9		)	—			—			(6		)
		25,339			(131,780		)	(16,100		)	12,075			(110,466		)
Cash and cash equivalents
Increase (decrease) for the period		—			1,381			(4,903		)	—			(3,522		)
Beginning of period		2			1,447			4,903			—			6,352
End of period		$	2		$	2,828		$	—		$	—		$	2,830
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2013		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Cash flows from operating activities		$	(34,605	)	$	197,678		$	20,007		$	—		$	183,080
Cash flows from investing activities
Additions to properties and equipment		—			(45,085		)	(7,016		)	—			(52,101		)
Proceeds from the sale of assets		—			2,731			—			—			2,731
Distributions from UNEV		—			9,375			—			(9,375		)	—
Distribution in excess of equity in earnings in SLC Pipeline		—			300			—			—			300
		—			(32,679		)	(7,016		)	(9,375		)	(49,070		)
Cash flows from financing activities
Net repayments under credit agreement		—			(58,000		)	—			—			(58,000		)
Net intercompany financing activities		105,031			(105,031		)	—			—			—
Proceeds from issuance of common units		73,444			—			—			—			73,444
Distributions to noncontrolling interests		—			—			(12,500		)	9,375			(3,125		)
Contributions from general partner		1,499			—			—			—			1,499
Distributions to HEP unitholders		(139,486		)	—			—			—			(139,486		)
Purchase of units for restricted grants		(5,634		)	—			—			—			(5,634		)
Deferred financing costs		—			(1,344		)	—			—			(1,344		)
Other		(249		)	—			—			—			(249		)
		34,605			(164,375		)	(12,500		)	9,375			(132,895		)
Cash and cash equivalents
Increase for the period		—			624			491			—			1,115
Beginning of period		2			823			4,412			—			5,237
End of period		$	2		$	1,447		$	4,903		$	—		$	6,352
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2012		Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
Cash flows from operating activities		$	(34,557	)	$	194,667		$	1,039		$	—		$	161,149
Cash flows from investing activities
Additions to properties and equipment		—			(28,134		)	(14,727		)	—			(42,861		)
Distributions in excess of equity in earnings in SLC Pipeline		—			262			—			—			262
		—			(27,872		)	(14,727		)	—			(42,599		)
Cash flows from financing activities
Net borrowings under credit agreement		—			221,000			—			—			221,000
Proceeds from issuance of senior notes		294,750			—			—			—			294,750
Net intercompany financing activities		51,989			(51,989		)	—			—			—
Cash distribution to HFC for UNEV acquisition		—			(260,922		)	—			—			(260,922		)
Redemption of senior notes		(185,000		)	(75,235		)	—			—			(260,235		)
Contributions from UNEV joint venture partners		—			—			15,000			—			15,000
Contributions from general partner		1,748			—			—			—			1,748
Distributions to HEP unitholders		(122,777		)	—			—			—			(122,777		)
Purchase of units for restricted grants		(5,240		)	321			—			—			(4,919		)
Deferred financing costs		(913		)	(2,325		)	—			—			(3,238		)
Other		—			(89		)	—			—			(89		)
		34,557			(169,239		)	15,000			—			(119,682		)
Cash and cash equivalents
Increase (decrease) for the period		—			(2,444		)	1,312			—			(1,132		)
Beginning of period		2			3,267			3,100			—			6,369
End of period		$	2		$	823		$	4,412		$	—		$	5,237

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation and Common Control Transactions, Policy	Principles of Consolidation and Common Control Transactions
	The consolidated financial statements include our accounts and those of subsidiaries and joint ventures that we control through a 50% or more ownership interest. All significant inter-company transactions and balances have been eliminated.
	Most of our asset acquisitions from HFC occurred while we were a consolidated variable interest entity of HFC. Therefore, as an entity under common control with HFC, we recorded these assets on our balance sheets at HFC's historical basis instead of our purchase price or fair value.
Use of Estimates, Policy	Use of Estimates
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Cash and Cash Equivalents, Policy	Cash and Cash Equivalents
	For purposes of the statements of cash flows, we consider all highly liquid investments with maturities of three months or less at the time of purchase to be cash equivalents. The carrying amounts reported on the balance sheets approximate fair value due to the short-term maturity of these instruments.
Accounts Receivable, Policy	Accounts Receivable
	The majority of the accounts receivable are due from affiliates of HFC, Alon or independent companies in the petroleum industry. Credit is extended based on evaluation of the customer's financial condition and, in certain circumstances, collateral such as letters of credit or guarantees, may be required. Credit losses are charged to income when accounts are deemed uncollectible and historically have been minimal.
Properties and Equipment, Policy	Properties and Equipment
	Properties and equipment are stated at cost. Properties and equipment acquired from HFC while under common control of HFC are stated at HFC's historical basis. Depreciation is provided by the straight-line method over the estimated useful lives of the assets, primarily 15 to 25 years for terminal facilities and tankage, 25 to 32 years for pipelines and 5 to 10 years for corporate and other assets. We depreciate assets acquired under capital leases over the lesser of the lease term or the economic life of the assets. Maintenance, repairs and minor replacements are expensed as incurred. Costs of replacements constituting improvements are capitalized.
Transportation Agreements, Policy	Transportation Agreements
	The transportation agreement assets are stated at acquisition date fair value and are being amortized over the periods of the agreements using the straight-line method. See Note 5 for additional information on our transportation agreements.
Goodwill and Long-Lived Assets, Policy	Goodwill and Long-Lived Assets
	Goodwill represents the excess of our cost of an acquired business over the fair value of the assets acquired, less liabilities assumed. Goodwill is not amortized and is tested for impairment annually or more frequently if events or changes in circumstances indicate goodwill may be impaired. We test goodwill at the reporting unit level for impairment annually and between annual tests if events or changes in circumstances indicate the carrying amount may exceed fair value. Recoverability is determined by comparing the estimated fair value of a reporting unit to the carrying value, including the related goodwill, of that reporting unit. We use the present value of the expected future net cash flows and market multiple analyses to determine the estimated fair values of the reporting units. The impairment test requires the use of projections, estimates and assumptions as to the future performance of our operations. Actual results could differ from projections resulting in revisions to our assumptions, and if required, recognizing an impairment loss.
	We evaluate long-lived assets, including finite intangible assets, for potential impairment by identifying whether indicators of impairment exist and, if so, assessing whether the long-lived assets are recoverable from estimated future undiscounted cash flows. The actual amount of impairment loss, if any, to be recorded is equal to the amount by which a long-lived asset's carrying value exceeds its fair value.
	There have been no impairments to goodwill or our long-lived assets as of December 31, 2014.
Investment in SLC Pipeline, Policy	Investment in SLC Pipeline
	We account for our 25% SLC Pipeline joint venture interest using the equity method of accounting, whereby we record our pro-rata share of earnings of the SLC Pipeline, and contributions to and distributions from the SLC Pipeline as adjustments to our investment balance. As of December 31, 2014, our underlying equity in the SLC Pipeline was $58.9 million compared to our recorded investment balance of $24.5 million, a difference of $34.4 million. We are amortizing this difference as an adjustment to our pro-rata share of earnings over the useful lives of the underlying assets of SLC Pipeline.
Asset Retirement Obligations, Policy	Asset Retirement Obligations
	We record legal obligations associated with the retirement of certain of our long-lived assets that result from the acquisition, construction, development and/or the normal operation of our long-lived assets. The fair value of the estimated cost to retire a tangible long-lived asset is recorded in the period in which the liability is incurred and when a reasonable estimate of the fair value of the liability can be made. For our pipeline assets, the right-of-way agreements typically do not require the dismantling, removal and reclamation of the right-of-way upon cessation of the pipeline service. Additionally, management is unable to predict when, or if, our pipelines and related facilities would become obsolete and require decommissioning. Accordingly, we have recorded no liability or corresponding asset related to an asset retirement obligation for the majority of our pipelines as both the amounts and timing of such potential future costs are indeterminable. For our remaining assets, at December 31, 2014 and 2013, we have asset retirement obligations of $6.8 million and $6.5 million, respectively, that are recorded under “Other long-term liabilities” in our consolidated balance sheets.
Revenue Recognition, Policy	Revenue Recognition
	Revenues are recognized as products are shipped through our pipelines and terminals or other services are rendered. Billings to customers for their obligations under their quarterly minimum revenue commitments are recorded as deferred revenue liabilities if the customer has the right to receive future services for these billings. The revenue is recognized at the earlier of:
	•	the customer receiving the future services provided by these billings,
	•	the period in which the customer is contractually allowed to receive the services expires, or
	•	our determination that we will not be required to provide services within the allowed period.
	We determine that we will not be required to provide services within the allowed period when, based on current and projected shipping levels, our pipeline systems will not have the necessary capacity to enable a customer to exceed its minimum volume levels to such a degree as to utilize the shortfall credit within its respective contractual shortfall make-up period.
	We have additional revenues under an operating lease to a third party of an interest in the capacity of one of our pipelines.
	As of December 31, 2014, billings to customers under their minimum revenue commitments per the terms of long-term throughput agreements expiring in 2019 through 2026 and the third party operating lease will result in minimum annualized payments to us in the aggregate of $2.5 billion including $272.4 million for each of the next five years. These agreements provide for increases in the minimum revenue guarantees annually for increases in the Producer Price Index ("PPI") or the Federal Energy Regulatory Commission ("FERC") index, with certain contracts having provisions that limit the level of the rate increases.
	We have other cost reimbursement provisions in our throughput / storage agreements providing that customers (including HFC) reimburse us for certain costs. Such reimbursement receipts are recorded as revenue or deferred revenue depending on the nature of the cost. Deferred revenue is recognized over the remaining contractual term of the related throughput agreement.
	Taxes billed and collected from our pipeline and terminal customers are recorded on a net basis with no effect on net income.
Environmental Costs, Policy	Environmental Costs
	Environmental costs are expensed if they relate to an existing condition caused by past operations and do not contribute to current or future revenue generation. Liabilities are recorded when site restoration and environmental remediation, cleanup and other obligations are either known or considered probable and can be reasonably estimated. Such estimates require judgment with respect to costs, time frame and extent of required remedial and clean-up activities and are subject to periodic adjustments based on currently available information. At December 31, 2014 and 2013, we had accrued liabilities, measured on an undiscounted basis, net of expected recoveries from indemnifying parties, for environmental remediation obligations of $5.2 million and $3.6 million respectively, of which $2.3 million and $0.4 million, respectively, were classified as other current liabilities.
	Under the Omnibus Agreement and certain transportation agreements and purchase agreements with HFC, HFC has agreed to indemnify us, subject to certain monetary and time limitations, for environmental noncompliance and remediation liabilities associated with certain assets transferred to us from HFC occurring or existing prior to the date of such transfers. We have an environmental agreement with Alon with respect to pre-closing environmental costs and liabilities relating to the pipelines and terminals acquired from Alon in 2005, under which Alon will indemnify us subject to certain monetary and time limitations. Environmental costs recoverable through insurance, indemnification agreements or other sources are included in other assets to the extent such recoveries are considered probable.
Income Tax, Policy	Income Tax
	We are subject to the Texas margin tax that is based on our Texas sourced taxable margin. The tax is calculated by applying a tax rate to a base that considers both revenues and expenses and therefore has the characteristics of an income tax.
	We are organized as a pass-through entity for federal income tax purposes. As a result, our partners are responsible for federal income taxes based on their respective share of taxable income.
	Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax bases and financial reporting bases of assets and liabilities and the taxable income allocation requirements under the partnership agreement.
Net Income per Limited Partners' Unit, Policy	Net Income per Limited Partners' Unit
	We use the two-class method when calculating the net income per unit applicable to limited partners, which is based on the weighted-average number of common and subordinated units outstanding during the year. Net income per unit applicable to limited partners is computed by dividing limited partners' interest in net income, after adjusting for the allocation of net income or loss attributable to previous owners ("Predecessor"), the allocation of net income or loss attributable to noncontrolling interests and the general partner's 2% interest and incentive distributions and other participating securities, by the weighted-average number of outstanding common, subordinated units and other dilutive securities. Other participating securities and dilutive securities are not significant.
New Accounting Pronouncements, Policy	New Accounting Pronouncements
	Revenue Recognition
	In May 2014, an accounting standard update 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 is effective January 1, 2017, and we are evaluating the impact of this standard.

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Financial Instruments Measured on Recurring Basis	The carrying amounts and estimated fair values of our senior notes and interest rate swaps were as follows:
			December 31, 2014				December 31, 2013
	Financial Instrument	Fair Value Input Level	Carrying		Fair Value		Carrying		Fair Value
			Value				Value
			(In thousands)
	Assets:
	Interest rate swaps	Level 2	$	1,019	$	1,019	$	1,670	$	1,670
	Liabilities:
	Senior notes:
	6.5% Senior Notes	Level 2	$	296,579	$	291,000	$	295,927	$	313,500
	8.25% Senior Notes	Level 2	—		—		148,703		158,250
			296,579		291,000		444,630		471,750
	Interest rate swaps	Level 2	1,065		1,065		1,814		1,814
			$	297,644	$	292,065	$	446,444	$	473,564

Properties_and_Equipment_Table

Properties and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Properties and Equipment	The carrying amounts of our properties and equipment are as follows:
		December 31,		December 31,
		2014		2013
		(In thousands)
	Pipelines, terminals and tankage	$	1,137,157	$	1,077,037
	Land and right of way	64,458		63,425
	Construction in progress	56,228		50,454
	Other	22,636		19,997
		1,280,479		1,210,913
	Less accumulated depreciation	300,000		253,099
		$	980,479	$	957,814

Transportation_Agreements_Tabl

Transportation Agreements (Tables)	12 Months Ended
	Dec. 31, 2014
Finite-Lived Intangible Assets, Gross [Abstract]
Transportation Agreements by Major Class	The carrying amounts of our transportation agreements are as follows:
		December 31,		December 31,
		2014		2013
		(In thousands)
	Alon transportation agreement	$	59,933	$	59,933
	HFC transportation agreement	74,231		74,231
		134,164		134,164
	Less accumulated amortization	53,461		46,514
		$	80,703	$	87,650

Employees_Retirement_and_Incen1

Employees, Retirement and Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	A summary of restricted unit and phantom unit activity and changes during the year ended December 31, 2014, is presented below:
	Restricted and Phantom Units	Units		Weighted-
				Average
				Grant-Date
				Fair Value
	Outstanding at January 1, 2014 (nonvested)	122,951		$	33.36
	Granted	91,852		33.49
	Vesting and transfer of full ownership to recipients	(80,645	)	33.22
	Forfeited	(8,081	)	35.28
	Outstanding at December 31, 2014 (nonvested)	126,077		$	33.43
Schedule of Nonvested Performance-based Units Activity	A summary of performance unit activity and changes during the twelve months ended December 31, 2014, is presented below:
	Performance Units	Units
	Outstanding at January 1, 2014 (nonvested)	75,216
	Granted	13,967
	Vesting and transfer of common units to recipients	(17,938	)
	Outstanding at December 31, 2014 (nonvested)	71,245

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instruments [Abstract]
Schedule of Long-term Debt Instruments	Long-term Debt
	The carrying amounts of our long-term debt are as follows:
		December 31,				December 31,
		2014				2013
		(In thousands)
	Credit Agreement	$	571,000			$	363,000
	6.5% Senior Notes
	Principal	300,000				300,000
	Unamortized discount	(3,421		)		(4,073		)
		296,579				295,927
	8.25% Senior Notes
	Principal	—				150,000
	Unamortized discount	—				(1,297		)
		—				148,703
	Total long-term debt	$	867,579			$	807,630
Schedule of Maturities of Long-term Debt	Maturities of our long-term debt are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	—
	2016	—
	2017	—
	2018	571,000
	2019	—
	Thereafter	300,000
	Total	$	871,000
Schedule of Derivative Instruments	Additional information on our interest rate swaps is as follows:
	Derivative Instrument	Balance Sheet Location		Fair Value				Location of Offsetting Balance	Offsetting
									Amount
		(In thousands)
	December 31, 2014
	Interest rate swaps designated as cash flow hedging instrument:
	Variable-to-fixed interest rate swap contract ($155 million of LIBOR based debt interest)	Other long-term		$	(1,065	)		Accumulated other	$	(1,065	)
		liabilities						comprehensive loss
	Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other long-term assets		1,019				Accumulated other	1,019
								comprehensive income
				$	(46	)			$	(46	)
	December 31, 2013
	Interest rate swaps designated as cash flow hedging instrument:
	Variable-to-fixed interest rate swap contract ($155 million of LIBOR based debt interest)	Other long-term		$	(1,814	)		Accumulated other	$	(1,814	)
		liabilities						comprehensive loss
	Variable-to-fixed interest rate swap contract ($150 million of LIBOR based debt interest)	Other long-term assets		1,670				Accumulated other	1,670
								comprehensive income
				$	(144	)			$	(144	)
Schedule of Interest Expense and Other Debt Information	Interest expense consists of the following components:
		Years Ended December 31,
		2014				2013			2012
		(In thousands)
	Interest on outstanding debt:
	Credit Agreement, net of interest on interest rate swaps	$	13,350			$	11,961		$	8,736
	6.5% Senior Notes	19,446				19,506			15,716
	6.25% Senior Notes	—				—			2,422
	8.25% Senior Notes	2,544				12,380			12,380
	Promissory Notes	—				—			543
	Amortization of discount and deferred debt issuance costs	1,821				2,120			1,946
	Amortization of unrecognized loss attributable to terminated cash flow hedge	—				849			5,095
	Commitment fees	450				835			621
	Total interest incurred	37,611				47,651			47,459
	Less capitalized interest	1,510				641			277
	Net interest expense	$	36,101			$	47,010		$	47,182
	Cash paid for interest	$	39,414			$	44,655		$	38,476

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments Disclosure Site Service Agreements [Table Text Block]	At December 31, 2014, these minimum future contractual obligations having terms in excess of one year are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	1,067
	2016	1,067
	2017	1,067
	2018	1,067
	2019	1,032
	Thereafter	6,294
	Total	$	11,594
Schedule of Future Minimum Rental Payments for Operating Leases	As of December 31, 2014, the minimum future rental commitments under operating leases having non-cancelable lease terms in excess of one year are as follows:
	Years Ending December 31,	(In thousands)
	2015	$	6,928
	2016	6,913
	2017	3,549
	2018	192
	2019	124
	Thereafter	266
	Total	$	17,972

Significant_Customers_Tables

Significant Customers (Tables)	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Schedules of Concentration of Risk, by Risk Factor	The following table presents the percentage of total revenues generated by each of these customers:
		Years Ended December 31,
		2014		2013		2012
	HFC	83	%	83	%	84	%
	Alon	10	%	11	%	11	%

Partners_Equity_Tables

Partners' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Partners' Capital [Abstract]
Schedule of Allocation of General Partner Interest in Net Income	The following table presents the allocation of the general partner interest in net income for the periods presented below:
		Years Ended December 31,
		2014			2013		2012
		(in thousands)
	General partner interest in net income	$	1,446		$	1,059	$	1,464
	General partner incentive distribution	33,221			26,464		20,986
	Total general partner interest in net income	$	34,667		$	27,523	$	22,450
Schedule of Distributions Made to Partners Percentages
		Total Quarterly Distribution		Marginal Percentage Interest in Distributions
		Target Amount		Unitholders	General Partner
	Minimum quarterly distribution	$0.25		98%	2%
	First target distribution	Up to $0.275		98%	2%
	Second target distribution	above $0.275 up to $0.3125		85%	15%
	Third target distribution	above $0.3125 up to $0.375		75%	25%
	Thereafter	Above $0.375		50%	50%
Schedule of Distributions Made to Members or Limited Partners, by Distribution	The following table presents the allocation of our regular quarterly cash distributions to the general and limited partners for the periods in which they apply. Our distributions are declared subsequent to quarter end; therefore, the amounts presented do not reflect distributions paid during the periods presented below.
		Years Ended December 31,
		2014			2013		2012
		(In thousands, except per unit data)
	General partner interest in distribution	$	3,264		$	2,982	$	2,566
	General partner incentive distribution	33,221			26,464		20,986
	Total general partner distribution	36,485			29,446		23,552
	Limited partner distribution	121,714			114,675		102,222
	Total regular quarterly cash distribution	$	158,199		$	144,121	$	125,774
	Cash distribution per unit applicable to limited partners	$	2.075		$	1.955	$	1.835

Quarterly_Financial_Data_Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information	Summarized quarterly financial data is as follows:
		First		Second		Third		Fourth		Total
		(In thousands, except per unit data)
	Year Ended December 31, 2014
	Revenues	$	87,004	$	74,998	$	82,130	$	88,413	$	332,545
	Operating income	$	45,453	$	32,033	$	38,925	$	38,343	$	154,754
	Income before income taxes	$	27,855	$	24,478	$	31,231	$	30,484	$	114,048
	Net income	$	27,780	$	24,450	$	31,189	$	30,394	$	113,813
	Net income attributable to Holly Energy Partners	$	24,143	$	23,034	$	29,680	$	28,668	$	105,525
	Limited partners’ per unit interest in net income – basic and diluted	$	0.27	$	0.25	$	0.35	$	0.33	$	1.2
	Distributions per limited partner unit	$	0.508	$	0.515	$	0.523	$	0.53	$	2.075
	Year Ended December 31, 2013
	Revenues	$	74,298	$	75,285	$	77,723	$	77,876	$	305,182
	Operating income	$	31,047	$	32,520	$	34,173	$	30,826	$	128,566
	Income before income taxes	$	21,345	$	21,641	$	23,097	$	20,331	$	86,414
	Net income	$	21,289	$	21,297	$	23,057	$	20,438	$	86,081
	Net income attributable to Holly Energy Partners	$	18,399	$	20,167	$	21,885	$	18,998	$	79,449
	Limited partners’ per unit interest in net income – basic and diluted	$	0.21	$	0.23	$	0.25	$	0.19	$	0.88
	Distributions per limited partner unit	$	0.478	$	0.485	$	0.493	$	0.5	$	1.955

Supplemental_Guarantor_NonGuar1

Supplemental Guarantor / Non-Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet
	December 31, 2014	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	2		$	2,828		$	—		$	—		$	2,830
	Accounts receivable	—			34,274			6,044			(189		)	40,129
	Prepaid and other current assets	212			2,856			1,315			—			4,383
	Total current assets	214			39,958			7,359			(189		)	47,342
	Properties and equipment, net	—			596,988			383,491			—			980,479
	Investment in subsidiaries	622,100			285,247			—			(907,347		)	—
	Transportation agreements, net	—			80,703			—			—			80,703
	Goodwill	—			256,498			—			—			256,498
	Investment in SLC Pipeline	—			24,478			—			—			24,478
	Other assets	1,319			10,736			—			—			12,055
	Total assets	$	623,633		$	1,294,608		$	390,850		$	(907,536	)	$	1,401,555
	LIABILITIES AND PARTNERS’ EQUITY
	Current liabilities:
	Accounts payable	$	—		$	15,495		$	2,575		$	(189	)	$	17,881
	Accrued interest	6,500			115			—			—			6,615
	Deferred revenue	—			5,672			6,760			—			12,432
	Accrued property taxes	—			1,902			801			—			2,703
	Other current liabilities	45			4,408			118			—			4,571
	Total current liabilities	6,545			27,592			10,254			(189		)	44,202
	Long-term debt	296,579			571,000			—			—			867,579
	Other long-term liabilities	147			17,731			267			—			18,145
	Deferred revenue	—			29,392			—			—			29,392
	Class B unit	—			26,793			—			—			26,793
	Equity - partners	320,362			622,100			380,329			(1,002,429		)	320,362
	Equity - noncontrolling interest	—			—			—			95,082			95,082
	Total liabilities and partners’ equity	$	623,633		$	1,294,608		$	390,850		$	(907,536	)	$	1,401,555
	Condensed Consolidating Balance Sheet
	December 31, 2013	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	ASSETS
	Current assets:
	Cash and cash equivalents	$	2		$	1,447		$	4,903		$	—		$	6,352
	Accounts receivable	—			31,107			4,543			(914		)	34,736
	Intercompany accounts receivable	—			62,516			—			(62,516		)	—
	Prepaid and other current assets	234			2,590			1,050			—			3,874
	Total current assets	236			97,660			10,496			(63,430		)	44,962
	Properties and equipment, net	—			564,847			392,967			—			957,814
	Investment in subsidiaries	885,598			292,464			—			(1,178,062		)	—
	Transportation agreements, net	—			87,650			—			—			87,650
	Goodwill	—			256,498			—			—			256,498
	Investment in SLC Pipeline	—			24,741			—			—			24,741
	Other assets	1,684			9,159			—			—			10,843
	Total assets	$	887,518		$	1,333,019		$	403,463		$	(1,241,492	)	$	1,382,508
	LIABILITIES AND PARTNERS’ EQUITY
	Current liabilities:
	Accounts payable	$	—		$	18,966		$	4,846		$	(914	)	$	22,898
	Intercompany accounts payable	62,516			—			—			(62,516		)	—
	Accrued interest	10,198			41			—			—			10,239
	Deferred revenue	—			6,406			7,575			—			13,981
	Accrued property taxes	—			1,661			942			—			2,603
	Other current liabilities	629			1,216			—			—			1,845
	Total current liabilities	73,343			28,290			13,363			(63,430		)	51,566
	Long-term debt	444,630			363,000			—			—			807,630
	Other long-term liabilities	99			14,338			148			—			14,585
	Deferred revenue	—			21,669			—			—			21,669
	Class B unit	—			20,124			—			—			20,124
	Equity - partners	369,446			885,598			389,952			(1,275,550		)	369,446
Equity - noncontrolling interest	—			—			—			97,488			97,488
Total liabilities and partners’ equity	$	887,518		$	1,333,019		$	403,463		$	(1,241,492	)	$	1,382,508
Condensed Consolidating Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2014	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Revenues:
	Affiliates	$	—		$	254,364		$	22,073		$	(1,241	)	$	275,196
	Third parties	—			45,711			11,638			—			57,349
		—			300,075			33,711			(1,241		)	332,545
	Operating costs and expenses:
	Operations (exclusive of depreciation and amortization)	—			93,382			12,660			(1,241		)	104,801
	Depreciation and amortization	—			47,592			14,574			—			62,166
	General and administrative	2,658			8,166			—			—			10,824
		2,658			149,140			27,234			(1,241		)	177,791
	Operating income (loss)	(2,658		)	150,935			6,477			—			154,754
	Equity in earnings of subsidiaries	138,691			4,858			—			(143,549		)	—
	Equity in earnings of SLC Pipeline	—			2,987			—			—			2,987
	Interest income	—			3			—			—			3
	Interest expense	(22,831		)	(13,270		)	—			—			(36,101		)
	Loss on early extinguishment of debt	(7,677		)	—			—			—			(7,677		)
	Other	—			82			—			—			82
		108,183			(5,340		)	—			(143,549		)	(40,706		)
	Income (loss) before income taxes	105,525			145,595			6,477			(143,549		)	114,048
	State income tax expense	—			(235		)	—			—			(235		)
	Net income (loss)	105,525			145,360			6,477			(143,549		)	113,813
	Allocation of net (income) attributable to noncontrolling interests	—			—			—			(8,288		)	(8,288		)
	Net income (loss) attributable to Holly Energy Partners	105,525			145,360			6,477			(151,837		)	105,525
	Other comprehensive (loss)	98			98			—			(98		)	98
	Comprehensive income (loss)	$	105,623		$	145,458		$	6,477		$	(151,935	)	$	105,623
	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2013	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Revenues:
	Affiliates	$	—		$	236,336		$	17,258		$	(1,226	)	$	252,368
	Third parties	—			42,139			10,675			—			52,814
		—			278,475			27,933			(1,226		)	305,182
	Operating costs and expenses:
	Operations (exclusive of depreciation and amortization)	—			88,614			12,056			(1,226		)	99,444
	Depreciation and amortization	—			51,082			14,341			—			65,423
	General and administrative	3,381			8,368			—			—			11,749
		3,381			148,064			26,397			(1,226		)	176,616
	Operating income (loss)	(3,381		)	130,411			1,536			—			128,566
	Equity in earnings of subsidiaries	115,850			1,231			—			(117,081		)	—
	Equity in earnings of SLC Pipeline	—			2,826			—			—			2,826
	Interest income	—			56			105			—			161
	Interest expense	(33,020		)	(13,990		)	—			—			(47,010		)
	Gain on sale of assets	—			1,810			—			—			1,810
	Other	—			61			—			—			61
		82,830			(8,006		)	105			(117,081		)	(42,152		)
	Income (loss) before income taxes	79,449			122,405			1,641			(117,081		)	86,414
	State income tax expense	—			(333		)	—			—			(333		)
	Net income (loss)	79,449			122,072			1,641			(117,081		)	86,081
	Allocation of net loss attributable to noncontrolling interests	—			—			—			(6,632		)	(6,632		)
	Net income (loss) attributable to Holly Energy Partners	79,449			122,072			1,641			(123,713		)	79,449
	Other comprehensive income	4,135			4,135			—			(4,135		)	4,135
	Comprehensive income (loss)	$	83,584		$	126,207		$	1,641		$	(127,848	)	$	83,584
	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2012	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Revenues:
	Affiliates	$	—		$	232,986		$	13,754		$	(1,158	)	$	245,582
	Third parties	—			41,984			4,994			—			46,978
		—			274,970			18,748			(1,158		)	292,560
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)	—			78,766			11,634			(1,158		)	89,242
Depreciation and amortization	—			43,147			14,314			—			57,461
General and administrative	3,336			4,258			—			—			7,594
	3,336			126,171			25,948			(1,158		)	154,297
Operating income (loss)	(3,336		)	148,799			(7,200		)	—			138,263
Equity in earnings (loss) of subsidiaries	130,743			(5,400		)	—			(125,343		)	—
Equity in earnings of SLC Pipeline	—			3,364			—			—			3,364
Interest expense	(31,523		)	(15,659		)	—			—			(47,182		)
Loss on early extinguishment of debt	(2,979		)	—			—			—			(2,979		)
Other	—			10			—			—			10
	96,241			(17,685		)	—			(125,343		)	(46,787		)
Income (loss) before income taxes	92,905			131,114			(7,200		)	(125,343		)	91,476
State income tax expense	—			(371		)	—			—			(371		)
Net income (loss)	92,905			130,743			(7,200		)	(125,343		)	91,105
Allocation of net loss attributable to Predecessors	4,200			—			—			—			4,200
Allocation of net loss attributable to noncontrolling interests	(2,953		)	—			—			1,800			(1,153		)
Net income (loss) attributable to Holly Energy Partners	94,152			130,743			(7,200		)	(123,543		)	94,152
Other comprehensive (loss)	2,185			2,185			—			(2,185		)	2,185
Comprehensive income (loss)	$	96,337		$	132,928		$	(7,200	)	$	(125,728	)	$	96,337
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2014	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Cash flows from operating activities	$	(25,339	)	$	193,273		$	19,398		$	(692	)	$	186,640
	Cash flows from investing activities
	Additions to properties and equipment	—			(71,758		)	(8,201		)	—			(79,959		)
	Distributions from UNEV	—			11,383			—			(11,383		)	—
	Distributions in excess of equity in earnings in SLC Pipeline	—			263			—			—			263
		—			(60,112		)	(8,201		)	(11,383		)	(79,696		)
	Cash flows from financing activities
	Net borrowings under credit agreement	—			208,000			—			—			208,000
	Net intercompany financing activities	339,771			(339,771		)	—			—			—
	Repayments of senior notes	(156,188		)	—			—			—			(156,188		)
	Distributions to HEP unitholders	(154,670		)	—			—			—			(154,670		)
	Distributions to noncontrolling interests	—			—			(16,100		)	12,075			(4,025		)
	Purchase of units for incentive grants	(3,577		)	—			—			—			(3,577		)
	Other	3			(9		)	—			—			(6		)
		25,339			(131,780		)	(16,100		)	12,075			(110,466		)
	Cash and cash equivalents
	Increase (decrease) for the period	—			1,381			(4,903		)	—			(3,522		)
	Beginning of period	2			1,447			4,903			—			6,352
	End of period	$	2		$	2,828		$	—		$	—		$	2,830
	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2013	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Cash flows from operating activities	$	(34,605	)	$	197,678		$	20,007		$	—		$	183,080
	Cash flows from investing activities
	Additions to properties and equipment	—			(45,085		)	(7,016		)	—			(52,101		)
	Proceeds from the sale of assets	—			2,731			—			—			2,731
	Distributions from UNEV	—			9,375			—			(9,375		)	—
	Distribution in excess of equity in earnings in SLC Pipeline	—			300			—			—			300
		—			(32,679		)	(7,016		)	(9,375		)	(49,070		)
	Cash flows from financing activities
	Net repayments under credit agreement	—			(58,000		)	—			—			(58,000		)
	Net intercompany financing activities	105,031			(105,031		)	—			—			—
	Proceeds from issuance of common units	73,444			—			—			—			73,444
	Distributions to noncontrolling interests	—			—			(12,500		)	9,375			(3,125		)
	Contributions from general partner	1,499			—			—			—			1,499
	Distributions to HEP unitholders	(139,486		)	—			—			—			(139,486		)
	Purchase of units for restricted grants	(5,634		)	—			—			—			(5,634		)
	Deferred financing costs	—			(1,344		)	—			—			(1,344		)
	Other	(249		)	—			—			—			(249		)
		34,605			(164,375		)	(12,500		)	9,375			(132,895		)
	Cash and cash equivalents
	Increase for the period	—			624			491			—			1,115
	Beginning of period	2			823			4,412			—			5,237
	End of period	$	2		$	1,447		$	4,903		$	—		$	6,352
	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2012	Parent			Guarantor			Non-Guarantor Non-Restricted Subsidiaries			Eliminations			Consolidated
					Restricted Subsidiaries
		(In thousands)
	Cash flows from operating activities	$	(34,557	)	$	194,667		$	1,039		$	—		$	161,149
	Cash flows from investing activities
	Additions to properties and equipment	—			(28,134		)	(14,727		)	—			(42,861		)
	Distributions in excess of equity in earnings in SLC Pipeline	—			262			—			—			262
		—			(27,872		)	(14,727		)	—			(42,599		)
	Cash flows from financing activities
	Net borrowings under credit agreement	—			221,000			—			—			221,000
	Proceeds from issuance of senior notes	294,750			—			—			—			294,750
	Net intercompany financing activities	51,989			(51,989		)	—			—			—
	Cash distribution to HFC for UNEV acquisition	—			(260,922		)	—			—			(260,922		)
	Redemption of senior notes	(185,000		)	(75,235		)	—			—			(260,235		)
Contributions from UNEV joint venture partners	—			—			15,000			—			15,000
Contributions from general partner	1,748			—			—			—			1,748
Distributions to HEP unitholders	(122,777		)	—			—			—			(122,777		)
Purchase of units for restricted grants	(5,240		)	321			—			—			(4,919		)
Deferred financing costs	(913		)	(2,325		)	—			—			(3,238		)
Other	—			(89		)	—			—			(89		)
	34,557			(169,239		)	15,000			—			(119,682		)
Cash and cash equivalents
Increase (decrease) for the period	—			(2,444		)	1,312			—			(1,132		)
Beginning of period	2			3,267			3,100			—			6,369
End of period	$	2		$	823		$	4,412		$	—		$	5,237

Description_of_Business_and_Pr

Description of Business and Presentation of Financial Statements (Details) (USD $)	3 Months Ended									12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 16, 2013	Jul. 12, 2012
Other Ownership Interests [Line Items]
Minimum Annualized Payments Receivable Aggregate	$2,500,000,000									$2,500,000,000
Partners' Capital Account, Sale of Units								73,400,000
Ownership percentage, controlling interest	39.00%									39.00%
General partner interest									2.00%	2.00%
Equity method investment, ownership percentage	50.00%									50.00%
Equity Method Investment, Underlying Equity in Net Assets	58,900,000									58,900,000
Sale of Stock, Number of Shares Issued in Transaction								1,875,000
Business Acquisitions, Limited partners interest in net income										70,858,000	51,926,000	71,702,000
Limited partners’ per unit interest in earnings—basic and diluted:	$0.33	$0.35	$0.25	$0.27	$0.19	$0.25	$0.23	$0.21		$1.20	$0.88	$1.29
Equity Method Investments	24,478,000				24,741,000					24,478,000	24,741,000
Asset Retirement Obligation	6,800,000				6,500,000					6,800,000	6,500,000
Minimum Annualized Payments Receivable	272,400,000									272,400,000
Accrual for Environmental Loss Contingencies	5,200,000				3,600,000					5,200,000	3,600,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	34,400,000									34,400,000
Loss on early extinguishment of debt										-7,677,000	0	-2,979,000
Common Units
Other Ownership Interests [Line Items]
Common unit split, conversion ratio													2
SLC Pipeline [Member]
Other Ownership Interests [Line Items]
Equity method investment, ownership percentage	25.00%									25.00%
Pipeline, length (miles)	95									95
UNEV Pipeline [Member]
Other Ownership Interests [Line Items]
Equity method investment, ownership percentage	75.00%									75.00%				75.00%
Pipeline, length (miles)	427									427
Pipeline, size (inches)	12									12
Other Fixed Assets [Member] | Minimum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										5 years
Other Fixed Assets [Member] | Maximum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										10 years
Pipelines and terminals [Member] | Minimum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										25 years
Pipelines and terminals [Member] | Maximum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										32 years
Terminal Facilities and Tankage [Member] [Member] | Minimum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										15 years
Terminal Facilities and Tankage [Member] [Member] | Maximum [Member]
Other Ownership Interests [Line Items]
Property, Plant and Equipment, Useful Life										25 years
General Partner HFC [Member]
Other Ownership Interests [Line Items]
Sale of Stock, Number of Shares Issued in Transaction								1,875,000
Other Current Liabilities [Member]
Other Ownership Interests [Line Items]
Accrual for Environmental Loss Contingencies	$2,300,000				$400,000					$2,300,000	$400,000

Acquisitions_Details

Acquisitions (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 12, 2012
												Consecutive_Quarters
Business Acquisition [Line Items]
Equity method investment, ownership percentage	50.00%								50.00%
Business Acquisition, Cost of Acquired Entity, Other Noncash Consideration	$26,793,000				$20,124,000				$26,793,000	$20,124,000
Net Income (Loss) Attributable to Noncontrolling Interest									8,288,000	6,632,000	1,153,000
Total revenues	88,413,000	82,130,000	74,998,000	87,004,000	77,876,000	77,723,000	75,285,000	74,298,000	332,545,000	305,182,000	292,560,000
Net Income	30,394,000	31,189,000	24,450,000	27,780,000	20,438,000	23,057,000	21,297,000	21,289,000	113,813,000	86,081,000	91,105,000
Business Acquisition, minimum annual revenue commitments									18,400,000
UNEV Pipeline [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage	75.00%								75.00%			75.00%
Cash distribution to HFC for UNEV Acquisition												260,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares												2,059,800
Business Acquisition, Payment of Contingent Consideration												900,000
Business Acquisition Percent Share of UNEV Earnings												50.00%
Business Acquisition, Post Acquisition Incentive Distributions									30,000,000			1,250,000
Number of Consecutive Quarters, Forego Rights to Incentive Distributions												12
Number Of Consecutive Quarters, Forego Rights To Incentive Distributions, Extension												4
Compound Percentage Increase to Class B Equity Units												7.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%								25.00%
Total revenues										18,700,000
Net Income										7,200,000
Net Income (Loss) for Period Prior to Acquisition										4,200,000
Revenues for period prior to acquisition										8,100,000
Business Acquisition, minimum annual revenue commitments									$27,100,000

Financial_Instruments_Narrativ

Financial Instruments (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$292,065	$473,564
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	296,579	295,927
6.5% Senior Notes [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	291,000	313,500
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	0	148,703
8.25% Senior Notes [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	0	158,250
Carrying Amount [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	297,644	446,444
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Asset	1,019	1,670
Financial Liabilities Fair Value Disclosure	1,065	1,814
Interest Rate Swap [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Derivative Asset	1,019	1,670
Financial Liabilities Fair Value Disclosure	1,065	1,814
Senior Debt Obligations [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	296,579	444,630
Senior Debt Obligations [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$291,000	$471,750

Properties_and_Equipment_Detai

Properties and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$1,280,479,000	$1,210,913,000
Less accumulated depreciation	300,000,000	253,099,000
Properties and equipment, net	980,479,000	957,814,000
Interest costs, capitalized during period	-1,510,000	-641,000	-277,000
Depreciation	54,700,000	58,100,000	50,100,000
Noncash Project Abandonment Costs	1,900,000	6,200,000	4,800,000
Pipelines and terminals [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	1,137,157,000	1,077,037,000
Land and right of way [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	64,458,000	63,425,000
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	56,228,000	50,454,000
Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$22,636,000	$19,997,000

Transportation_Agreements_Deta

Transportation Agreements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Components
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	$6,900,000
Transportation Agreements [Abstract]
Transportation agreements, gross	134,164,000	134,164,000
Less accumulated amortization	53,461,000	46,514,000
Transportation agreements, net	80,703,000	87,650,000
Basis in Transportation Agreements	0
HFC transportation agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life (years)	15 years
Transportation Agreements [Abstract]
Transportation agreements, gross	74,231,000	74,231,000
Alon transportation agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life (years)	30 years
Finite-Lived Intangible Assets, Inital Term of Useful Life	15 years
Finite-Lived Intangible Assets, Useful Life, Initial Term	15 years
Transportation Agreements [Abstract]
Transportation agreements, gross	$59,933,000	$59,933,000

Employees_Retirement_and_Incen2

Employees, Retirement and Incentive Plans Retirement and Benefit Plan Costs (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Components	Y
	Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee benefits and share-based compensation		$7,400,000	$7,400,000	$6,900,000
Pension Expense		4,400,000	5,000,000	4,300,000
Long-term incentive plan, components	4
Equity-based compensation, types	3	3
Compensation Costs Charged to Income		$3,539,000	$3,575,000	$2,858,000
Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units authorized under equity-based compensation plans	2,500,000	2,500,000
Number of units available for grant	1,530,748	1,530,748

Employees_Retirement_and_Incen3

Employees, Retirement and Incentive Plans Restricted Units (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Phantom Share Units (PSUs) [Member]
Weighted Average Grant-Date Fair Value
Award vesting period	1 year
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2014 (nonvested)	122,951
Granted	91,852
Vesting and transfer of full ownership to recipients	80,645
Forfeited	-8,081
Outstanding at December 31, 2014 (nonvested)	126,077	122,951
Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2014 (nonvested)	$33.36
Granted	$33.49
Vesting and transfer of full ownership to recipients	$33.22	$34.66	$31.01
Forfeited	$35.28
Outstanding at December 31, 2014 (nonvested)	$33.43	$33.36
Weighted average remaining contractual term (years)	1 year 6 months
Fair value of vested units transferred to recipients	$2.70	$1.20	$2.40
Total unrecognized compensation related to nonvested units	$3
Minimum [Member] | Restricted Stock [Member]
Weighted Average Grant-Date Fair Value
Award vesting period	1 year
Minimum [Member] | Restricted Stock Units (RSUs) [Member]
Weighted Average Grant-Date Fair Value
Award vesting period	1 year
Maximum [Member] | Restricted Stock [Member]
Weighted Average Grant-Date Fair Value
Award vesting period	3 years
Maximum [Member] | Restricted Stock Units (RSUs) [Member]
Weighted Average Grant-Date Fair Value
Award vesting period	3 years

Employees_Retirement_and_Incen4

Employees, Retirement and Incentive Plans Performance Units (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Purchase of units for incentive grants	($3,577,000)	($5,634,000)	($4,919,000)
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at January 1, 2014 (nonvested)	75,216			75,216
Granted	13,967
Vesting and transfer of full ownership to recipients	-17,938
Outstanding at December 31, 2014 (nonvested)	71,245				71,245
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Executive Officer [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Certain Officers [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Long-term Incentive Plan [Member] | Certain Officers [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures				13,967
Maximum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Long-term Incentive Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Fair value of vested units transferred to recipients	500,000
Weighted average fair value, units vested and transferred to recipients	$2,600,000				2,600,000
Total unrecognized compensation related to nonvested units	$1,100,000				1,100,000
Weighted average remaining contractual term (years)	1 year 2 months 13 days
Long-term Incentive Plan [Member] | Certain Officers [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of performance units earned, based on performance units granted, minimum (percent)	50.00%
Range of performance units earned, based on performance units granted, maximum (percent)	150.00%
Grants in period, weighted average grant date fair value		$37.90	$30.61		33.57

Debt_Credit_Agreement_Details

Debt Credit Agreement (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	2.15%	2.16%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Maximum Capacity	50
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity	650
Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
Minimum [Member] | Option AA [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.63%
Minimum [Member] | Option (b) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.63%
Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.45%
Maximum [Member] | Option AA [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Maximum [Member] | Option (b) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%

Debt_Senior_Notes_Details

Debt Senior Notes (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2012
Debt Instrument [Line Items]
Proceeds from senior notes	$0	$0	$294,750,000
Loss on early extinguishment of debt	-7,677,000	0	-2,979,000
Credit agreement restrictions before 2015	206,000,000
Credit agreement restrictions 2015 to 2018	171,000,000
8.25% Interest Rate [Member]
Debt Instrument [Line Items]
Principal				150,000,000
Stated interest rate, senior notes				8.25%
Senior Notes Aggregate Redemption Amount				156,200,000
Loss on early extinguishment of debt				7,700,000
Debt Instrument, Unamortized Premium				6,200,000
Amortization of Financing Costs				1,500,000
6.5% Interest Rate [Member]
Debt Instrument [Line Items]
Principal					300,000,000
Proceeds from senior notes					294,800,000
Stated interest rate, senior notes	6.50%				6.50%
6.25% Interest Rate [Member]
Debt Instrument [Line Items]
Repayment of senior notes					185,000,000
Stated interest rate, senior notes					6.25%
Promissory Notes [Member]
Debt Instrument [Line Items]
Repayment of notes					($72,900,000)

Debt_LongTerm_Debt_Details

Debt Long-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$571,000	$363,000
Total long-term debt	867,579	807,630
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal	300,000	300,000
Unamortized discount	-3,421	-4,073
Senior Notes	296,579	295,927
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Principal	0	150,000
Unamortized discount	0	-1,297
Senior Notes	$0	$148,703

Debt_Interest_Rate_Risk_Manage

Debt Interest Rate Risk Management (Details) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$571,000,000	$571,000,000	$363,000,000
Debt instrument, effective interest rate	2.15%	2.15%	2.16%
Accumulated other comprehensive loss	-46,000	-46,000	-144,000
Derivative liabilities, fair value	46,000	46,000	144,000
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	500,000
Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	305,000,000	305,000,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	155,000,000	155,000,000
Long-term debt, fixed interest rate	0.99%	0.99%
Debt Instrument, Basis Spread on Variable Rate	2.00%
Debt instrument, effective interest rate	2.99%	2.99%
Accumulated other comprehensive loss	0	0
Interest Rate Swap [Member] | Cash Flow Hedging, Added 2012 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	150,000,000	150,000,000
Long-term debt, fixed interest rate	0.74%	0.74%
Debt Instrument, Basis Spread on Variable Rate	2.00%
Debt instrument, effective interest rate	2.74%	2.74%
Number of interest rate swaps	2	2
Previous Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative, Cost of Hedge		6,000,000
Debt instrument, effective interest rate	6.24%	6.24%
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value	1,065,000	1,065,000	1,814,000
Accumulated Other Comprehensive Income (Loss) [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value	1,065,000	1,065,000	1,814,000
Derivative Asset	1,019,000	1,019,000	1,670,000
Other Noncurrent Assets [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative Asset	1,019,000	1,019,000	1,670,000
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value	$46,000	$46,000	$144,000

Debt_Interest_Expense_and_Othe

Debt Interest Expense and Other Debt Information (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Interest expense, debt		$37,611	$47,651	$47,459
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		0	849	5,095
Less capitalized interest		1,510	641	277
Net interest expense		36,101	47,010	47,182
Cash paid for interest		39,414	44,655	38,476
Loss on early extinguishment of debt		7,677	0	2,979
Repayments of senior notes	185,000	156,188	0	260,235
6.25% Interest Rate [Member]
Debt Instrument [Line Items]
Stated interest rate, senior notes					6.25%
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt		19,446	19,506	15,716
Stated interest rate, senior notes		6.50%
6.25% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt		0	0	2,422
Stated interest rate, senior notes
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt		2,544	12,380	12,380
Stated interest rate, senior notes
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Interest expense, debt		0	0	543
Amortization discount and deferred debt issuance costs [Member]
Debt Instrument [Line Items]
Interest expense, debt		1,821	2,120	1,946
Commitment Fees [Member]
Debt Instrument [Line Items]
Interest expense, debt		450	835	621
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense, debt		$13,350	$11,961	$8,736

Debt_Debt_Maturities_by_Year_D

Debt Debt Maturities by Year (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	571,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	300,000
Long-term Debt	$871,000

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-term Purchase Commitment [Line Items]
Operating Leases, Future Minimum Payments Due, Current Year	$6,928,000
Operating Leases, Future Minimum Payments, Due in Two Years	6,913,000
Operating Leases, Future Minimum Payments, Due in Three Years	3,549,000
Operating Leases, Future Minimum Payments, Due in Four Years	192,000
Operating Leases, Future Minimum Payments, Due in Five Years	124,000
Operating Leases, Future Minimum Payments, Due Thereafter	266,000
Operating Leases, Future Minimum Payments Due	17,972,000
Operating Leases, Rent Expense	8,000,000	8,300,000	8,100,000
Site Service Commitments
Long-term Purchase Commitment [Line Items]
Operating Leases, Future Minimum Payments Due, Current Year	1,067,000
Operating Leases, Future Minimum Payments, Due in Two Years	1,067,000
Operating Leases, Future Minimum Payments, Due in Three Years	1,067,000
Operating Leases, Future Minimum Payments, Due in Four Years	1,067,000
Operating Leases, Future Minimum Payments, Due in Five Years	1,032,000
Operating Leases, Future Minimum Payments, Due Thereafter	6,294,000
Operating Leases, Future Minimum Payments Due	$11,594,000

Significant_Customers_Details

Significant Customers (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Concentration risk, percentage	93.00%
Concentration risk, number of significant customers	2
HFC [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	83.00%	83.00%	84.00%
Alon [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	11.00%	11.00%

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Related Party Transaction [Line Items]
Minimum Annualized Payments Receivable	$272,400,000			$272,400,000
Affiliates	275,196,000	252,368,000	245,582,000
Due from Affiliates	33,392,000	29,675,000		33,392,000
Due to Affiliate, Current	5,239,000	8,484,000		5,239,000
Equity method investment, ownership percentage	50.00%			50.00%
HFC [Member]
Related Party Transaction [Line Items]
Costs and Expenses, Related Party	2,300,000			2,400,000
Minimum Annualized Payments Receivable	231,600,000			231,600,000
UNEV Pipeline [Member]
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	75.00%			75.00%
Annual Administrative Fee [Member]
Related Party Transaction [Line Items]
Costs and Expenses, Related Party	2,300,000
Shortfall Payments [Member]
Related Party Transaction [Line Items]
Affiliates	10,100,000	5,100,000	7,800,000
Deferred Revenue, Additions	7,300,000	10,100,000
Reimbursements Paid [Member]
Related Party Transaction [Line Items]
Expenses resulting from agreement with related party	38,900,000	34,600,000	31,100,000
Proceeds From Reimbursements Received [Member]
Related Party Transaction [Line Items]
Reimbursements paid to related parties	16,800,000	21,600,000	13,400,000
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	$80,500,000	$71,400,000	$64,000,000

Partners_Equity_Details

Partners' Equity (Details) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Jul. 12, 2012	Jan. 16, 2013
Capital Unit [Line Items]
Partners' capital account, units held by controlling interest			22,380,030
General partner ownership interest		2.00%	2.00%
Ownership percentage, controlling interest			39.00%
Sale of Stock, Number of Shares Issued in Transaction	1,875,000
Partners' Capital Account, Sale of Units	$73,400,000
Equity method investment, ownership percentage			50.00%
General Partners' Contributed Capital		1,700,000
Public Offering of Securities, Maximum Proceeds Authorized			$2,000,000,000
UNEV Pipeline [Member]
Capital Unit [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares				2,059,800
Equity method investment, ownership percentage			75.00%	75.00%
General Partner HFC [Member]
Capital Unit [Line Items]
Sale of Stock, Number of Shares Issued in Transaction	1,875,000
Common Units
Capital Unit [Line Items]
Common unit split, conversion ratio					2

Partners_Equity_Allocations_of

Partners' Equity, Allocations of Net Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Partners' Capital [Abstract]
General partner interest in net income	$1,446	$1,059	$1,464
General partner incentive distribution	33,221	26,464	20,986
Total general partner interest in net income	$34,667	$27,523	$22,450

Partners_Equity_Cash_Distribut

Partners' Equity, Cash Distributions (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners Capital, Distribution Amount per share Minimum									$0.25
Partners' Capital, Distribution Amount Per Share	$0								$0
Distribution of Available Cash to Unitholders, Period									45 days
Partner Distributions
General partner interest in distribution									$3,264	$2,982	$2,566
General partner incentive distribution									33,221	26,464	20,986
Total general partner distribution									36,485	29,446	23,552
Limited partner distribution									121,714	114,675	102,222
Total regular quarterly cash distribution									$158,199	$144,121	$125,774
Cash distribution per unit applicable to limited partners	$0.53	$0.52	$0.52	$0.51	$0.50	$0.49	$0.49	$0.48	$2.08	$1.96	$1.84
Minimum Quarterly Distribution Percentage [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General Partners Capital, Distribution Amount per share									2.00%
Partners Capital Distribution percentage									98.00%
Partner Distributions
General Partners Capital, Distribution Amount per share	0.00%								0.00%
First Target Distribution [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners Capital, Distribution Amount per share Maximum									$0.28
General Partners Capital, Distribution Amount per share									2.00%
Partners Capital Distribution percentage									98.00%
Second Distribution Target [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners Capital, Distribution Amount per share Minimum									$0.28
Partners Capital, Distribution Amount per share Maximum									$0.31
General Partners Capital, Distribution Amount per share									15.00%
Partners Capital Distribution percentage									85.00%
Third Target Distribution [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners Capital, Distribution Amount per share Minimum									$0.31
Partners Capital, Distribution Amount per share Maximum									$0.38
General Partners Capital, Distribution Amount per share									25.00%
Partners Capital Distribution percentage									75.00%
Thereafter Target Distribution [Member]
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Partners Capital, Distribution Amount per share Minimum									$0.38
General Partners Capital, Distribution Amount per share									50.00%
Partners Capital Distribution percentage									50.00%

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Total revenues	$88,413	$82,130	$74,998	$87,004	$77,876	$77,723	$75,285	$74,298	$332,545	$305,182	$292,560
Operating Income (Loss)	38,343	38,925	32,033	45,453	30,826	34,173	32,520	31,047	154,754	128,566	138,263
Income before Income Taxes	30,484	31,231	24,478	27,855	20,331	23,097	21,641	21,345	114,048	86,414	91,476
Net Income	30,394	31,189	24,450	27,780	20,438	23,057	21,297	21,289	113,813	86,081	91,105
Net Income attributable to Holly Energy Partners	$28,668	$29,680	$23,034	$24,143	$18,998	$21,885	$20,167	$18,399	$105,525	$79,449	$94,152
Limited partners’ per unit interest in earnings—basic and diluted:	$0.33	$0.35	$0.25	$0.27	$0.19	$0.25	$0.23	$0.21	$1.20	$0.88	$1.29
Limited Partners' per unit interest in net income - basic and diluted	$0.53	$0.52	$0.52	$0.51	$0.50	$0.49	$0.49	$0.48	$2.08	$1.96	$1.84

Supplemental_Guarantor_NonGuar2

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$2,830	$6,352	$5,237	$6,369
Accounts receivable	40,129	34,736
Accounts Receivable, Related Parties, Current	0	0
Prepaid and other current assets	4,383	3,874
Total current assets	47,342	44,962
Properties and equipment, net	980,479	957,814
Investments in subsidiaries	0	0
Transportation agreements, net	80,703	87,650
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,478	24,741
Other assets	12,055	10,843
Total assets	1,401,555	1,382,508
Current liabilities:
Accounts payable	17,881	22,898
Accounts Payable, Related Parties, Current	0	0
Accrued interest	6,615	10,239
Deferred revenue	12,432	13,981
Accrued property taxes	2,703	2,603
Other current liabilities	4,571	1,845
Total current liabilities	44,202	51,566
Long-term debt	867,579	807,630
Other long-term liabilities	18,145	14,585
Deferred Revenue	29,392	21,669
Class B unit	26,793	20,124
Equity - partners	320,362	369,446
Equity - noncontrolling interest	95,082	97,488
Total liabilities and equity	1,401,555	1,382,508
Parent [Member]
Current assets:
Cash and cash equivalents	2	2	2	2
Accounts receivable	0	0
Accounts Receivable, Related Parties, Current	0	0
Prepaid and other current assets	212	234
Total current assets	214	236
Properties and equipment, net	0	0
Investments in subsidiaries	622,100	885,598
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	1,319	1,684
Total assets	623,633	887,518
Current liabilities:
Accounts payable	0	0
Accounts Payable, Related Parties, Current	0	62,516
Accrued interest	6,500	10,198
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	45	629
Total current liabilities	6,545	73,343
Long-term debt	296,579	444,630
Other long-term liabilities	147	99
Deferred Revenue	0	0
Class B unit	0	0
Equity - partners	320,362	369,446
Equity - noncontrolling interest	0	0
Total liabilities and equity	623,633	887,518
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	2,828	1,447	823	3,267
Accounts receivable	34,274	31,107
Accounts Receivable, Related Parties, Current	0	62,516
Prepaid and other current assets	2,856	2,590
Total current assets	39,958	97,660
Properties and equipment, net	596,988	564,847
Investments in subsidiaries	285,247	292,464
Transportation agreements, net	80,703	87,650
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,478	24,741
Other assets	10,736	9,159
Total assets	1,294,608	1,333,019
Current liabilities:
Accounts payable	15,495	18,966
Accounts Payable, Related Parties, Current	0	0
Accrued interest	115	41
Deferred revenue	5,672	6,406
Accrued property taxes	1,902	1,661
Other current liabilities	4,408	1,216
Total current liabilities	27,592	28,290
Long-term debt	571,000	363,000
Other long-term liabilities	17,731	14,338
Deferred Revenue	29,392	21,669
Class B unit	26,793	20,124
Equity - partners	622,100	885,598
Equity - noncontrolling interest	0	0
Total liabilities and equity	1,294,608	1,333,019
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	4,903	4,412	3,100
Accounts receivable	6,044	4,543
Accounts Receivable, Related Parties, Current	0	0
Prepaid and other current assets	1,315	1,050
Total current assets	7,359	10,496
Properties and equipment, net	383,491	392,967
Investments in subsidiaries	0	0
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	0	0
Total assets	390,850	403,463
Current liabilities:
Accounts payable	2,575	4,846
Accounts Payable, Related Parties, Current	0	0
Accrued interest	0	0
Deferred revenue	6,760	7,575
Accrued property taxes	801	942
Other current liabilities	118	0
Total current liabilities	10,254	13,363
Long-term debt	0	0
Other long-term liabilities	267	148
Deferred Revenue	0	0
Class B unit	0	0
Equity - partners	380,329	389,952
Equity - noncontrolling interest	0	0
Total liabilities and equity	390,850	403,463
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable	-189	-914
Accounts Receivable, Related Parties, Current	0	-62,516
Prepaid and other current assets	0	0
Total current assets	-189	-63,430
Properties and equipment, net	0	0
Investments in subsidiaries	-907,347	-1,178,062
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	0	0
Total assets	-907,536	-1,241,492
Current liabilities:
Accounts payable	-189	-914
Accounts Payable, Related Parties, Current	0	-62,516
Accrued interest	0	0
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	0	0
Total current liabilities	-189	-63,430
Long-term debt	0	0
Other long-term liabilities	0	0
Deferred Revenue	0	0
Class B unit	0	0
Equity - partners	-1,002,429	-1,275,550
Equity - noncontrolling interest	95,082	97,488
Total liabilities and equity	($907,536)	($1,241,492)

Supplemental_Guarantor_NonGuar3

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Comprehensive Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues [Abstract]
Affiliates									$275,196	$252,368	$245,582
Third parties									57,349	52,814	46,978
Total revenues	88,413	82,130	74,998	87,004	77,876	77,723	75,285	74,298	332,545	305,182	292,560
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)									104,801	99,444	89,242
Depreciation and amortization									62,166	65,423	57,461
General and administrative									10,824	11,749	7,594
Operating Expenses									177,791	176,616	154,297
Operating income (loss)	38,343	38,925	32,033	45,453	30,826	34,173	32,520	31,047	154,754	128,566	138,263
Income (Loss) from Equity Method Investments									0	0	0
Interest Income									3	161	0
Interest expense									-36,101	-47,010	-47,182
Interest Revenue (Expense), Net										-47,010	-47,182
Gain on sale of assets									0	1,810	0
Loss on early extinguishment of debt									-7,677	0	-2,979
Other Income									82	61	10
Total other income (expense)									-40,706	-42,152	-46,787
Income before Income Taxes	30,484	31,231	24,478	27,855	20,331	23,097	21,641	21,345	114,048	86,414	91,476
State income tax expense									-235	-333	-371
Net income									113,813	86,081	91,105
Allocation of net loss attributable to Predecessors									0	0	4,200
Allocation of net income (loss) attributable to noncontrolling interest									-8,288	-6,632	-1,153
Net Income attributable to Holly Energy Partners	28,668	29,680	23,034	24,143	18,998	21,885	20,167	18,399	105,525	79,449	94,152
Other comprehensive income (loss)									98	4,135	2,185
Comprehensive Income									105,623	83,584	96,337
SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments									-2,987	-2,826	-3,364
Parent [Member]
Revenues [Abstract]
Affiliates									0	0	0
Third parties									0	0	0
Total revenues									0	0	0
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)									0	0	0
Depreciation and amortization									0	0	0
General and administrative									2,658	3,381	3,336
Operating Expenses									2,658	3,381	3,336
Operating income (loss)									-2,658	-3,381	-3,336
Income (Loss) from Equity Method Investments									-138,691	-115,850	-130,743
Interest Income									0	0
Interest expense									-22,831
Interest Revenue (Expense), Net										-33,020	-31,523
Gain on sale of assets										0
Loss on early extinguishment of debt									-7,677		-2,979
Other Income									0	0	0
Total other income (expense)									108,183	82,830	96,241
Income before Income Taxes									105,525	79,449	92,905
State income tax expense									0	0	0
Net income									105,525	79,449	92,905
Allocation of net loss attributable to Predecessors											4,200
Allocation of net income (loss) attributable to noncontrolling interest									0	0	-2,953
Net Income attributable to Holly Energy Partners									105,525	79,449	94,152
Other comprehensive income (loss)									98	4,135	2,185
Comprehensive Income									105,623	83,584	96,337
Parent [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments									0	0	0
Guarantor Subsidiaries [Member]
Revenues [Abstract]
Affiliates									254,364	236,336	232,986
Third parties									45,711	42,139	41,984
Total revenues									300,075	278,475	274,970
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)									93,382	88,614	78,766
Depreciation and amortization									47,592	51,082	43,147
General and administrative									8,166	8,368	4,258
Operating Expenses									149,140	148,064	126,171
Operating income (loss)									150,935	130,411	148,799
Income (Loss) from Equity Method Investments									-4,858	-1,231	5,400
Interest Income									3	56
Interest expense									-13,270
Interest Revenue (Expense), Net										-13,990	-15,659
Gain on sale of assets										1,810
Loss on early extinguishment of debt									0		0
Other Income									82	61	10
Total other income (expense)									-5,340	-8,006	-17,685
Income before Income Taxes									145,595	122,405	131,114
State income tax expense									-235	-333	-371
Net income									145,360	122,072	130,743
Allocation of net loss attributable to Predecessors											0
Allocation of net income (loss) attributable to noncontrolling interest									0	0	0
Net Income attributable to Holly Energy Partners									145,360	122,072	130,743
Other comprehensive income (loss)									98	4,135	2,185
Comprehensive Income									145,458	126,207	132,928
Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments									-2,987	-2,826	-3,364
Non-Guarantor Subsidiaries [Member]
Revenues [Abstract]
Affiliates									22,073	17,258	13,754
Third parties									11,638	10,675	4,994
Total revenues									33,711	27,933	18,748
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)									12,660	12,056	11,634
Depreciation and amortization									14,574	14,341	14,314
General and administrative									0	0	0
Operating Expenses									27,234	26,397	25,948
Operating income (loss)									6,477	1,536	-7,200
Income (Loss) from Equity Method Investments									0	0	0
Interest Income									0	105
Interest expense									0
Interest Revenue (Expense), Net										0	0
Gain on sale of assets										0
Loss on early extinguishment of debt									0		0
Other Income									0	0	0
Total other income (expense)									0	105	0
Income before Income Taxes									6,477	1,641	-7,200
State income tax expense									0	0	0
Net income									6,477	1,641	-7,200
Allocation of net loss attributable to Predecessors											0
Allocation of net income (loss) attributable to noncontrolling interest									0	0	0
Net Income attributable to Holly Energy Partners									6,477	1,641	-7,200
Other comprehensive income (loss)									0	0	0
Comprehensive Income									6,477	1,641	-7,200
Non-Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments									0	0	0
Eliminations [Member]
Revenues [Abstract]
Affiliates									-1,241	-1,226	-1,158
Third parties									0	0	0
Total revenues									-1,241	-1,226	-1,158
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)									-1,241	-1,226	-1,158
Depreciation and amortization									0	0	0
General and administrative									0	0	0
Operating Expenses									-1,241	-1,226	-1,158
Operating income (loss)									0	0	0
Income (Loss) from Equity Method Investments									143,549	117,081	125,343
Interest Income									0	0
Interest expense									0
Interest Revenue (Expense), Net										0	0
Gain on sale of assets										0
Loss on early extinguishment of debt									0		0
Other Income									0	0	0
Total other income (expense)									-143,549	-117,081	-125,343
Income before Income Taxes									-143,549	-117,081	-125,343
State income tax expense									0	0	0
Net income									-143,549	-117,081	-125,343
Allocation of net loss attributable to Predecessors											0
Allocation of net income (loss) attributable to noncontrolling interest									-8,288	-6,632	1,800
Net Income attributable to Holly Energy Partners									-151,837	-123,713	-123,543
Other comprehensive income (loss)									-98	-4,135	-2,185
Comprehensive Income									-151,935	-127,848	-125,728
Eliminations [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments									$0	$0	$0

Supplemental_Guarantor_NonGuar4

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$186,640	$183,080	$161,149
Cash flows from investing activities
Additions to properties and equipment	-79,959	-52,101	-42,861
Proceeds from sale of assets	0	2,731	0
Distributions from UNEV	0	0
Distributions in Excess of Equity in Earnings in SLC Pipeline	263	300	262
Net Cash Provided by (Used in) Investing Activities	-79,696	-49,070	-42,599
Cash flows from financing activities
Proceeds from (Repayments of) Lines of Credit	208,000	-58,000	221,000
Proceeds from issuance of senior notes	0	0	294,750
Net Intercompany Financing Activities	0	0	0
Cash distribution to HFC for UNEV acquisition	0	0	-260,922
Proceeds from issuance of common units	0	73,444	0
Repayments of senior notes	-156,188	0	-260,235
Contributions from noncontrolling interests	0	0	15,000
Distributions to HEP unitholders	-154,670	-139,486	-122,777
Distributions to noncontrolling interest	-4,025	-3,125	0
Contribution from general partner		1,499	1,748
Purchase of units for incentive grants	-3,577	-5,634	-4,919
Deferred financing costs	0	-1,344	-3,238
Other	-6	-249	-89
Net cash used by financing activities	-110,466	-132,895	-119,682
Increase (decrease) for the year	-3,522	1,115	-1,132
Beginning of period	6,352	5,237	6,369
End of period	2,830	6,352	5,237
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	-25,339	-34,605	-34,557
Cash flows from investing activities
Additions to properties and equipment	0	0	0
Proceeds from sale of assets		0
Distributions from UNEV	0	0
Distributions in Excess of Equity in Earnings in SLC Pipeline	0	0	0
Net Cash Provided by (Used in) Investing Activities	0	0	0
Cash flows from financing activities
Proceeds from (Repayments of) Lines of Credit	0	0	0
Proceeds from issuance of senior notes			294,750
Net Intercompany Financing Activities	339,771	105,031	51,989
Cash distribution to HFC for UNEV acquisition			0
Proceeds from issuance of common units		73,444
Repayments of senior notes	-156,188		-185,000
Contributions from noncontrolling interests			0
Distributions to HEP unitholders	-154,670	-139,486	-122,777
Distributions to noncontrolling interest	0	0
Contribution from general partner		1,499	1,748
Purchase of units for incentive grants	-3,577	-5,634	-5,240
Deferred financing costs		0	-913
Other	3	-249	0
Net cash used by financing activities	25,339	34,605	34,557
Increase (decrease) for the year	0	0	0
Beginning of period	2	2	2
End of period	2	2	2
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	193,273	197,678	194,667
Cash flows from investing activities
Additions to properties and equipment	-71,758	-45,085	-28,134
Proceeds from sale of assets		2,731
Distributions from UNEV	11,383	9,375
Distributions in Excess of Equity in Earnings in SLC Pipeline	263	300	262
Net Cash Provided by (Used in) Investing Activities	-60,112	-32,679	-27,872
Cash flows from financing activities
Proceeds from (Repayments of) Lines of Credit	208,000	-58,000	221,000
Proceeds from issuance of senior notes			0
Net Intercompany Financing Activities	-339,771	-105,031	-51,989
Cash distribution to HFC for UNEV acquisition			-260,922
Proceeds from issuance of common units		0
Repayments of senior notes	0		-75,235
Contributions from noncontrolling interests			0
Distributions to HEP unitholders	0	0	0
Distributions to noncontrolling interest	0	0
Contribution from general partner		0	0
Purchase of units for incentive grants	0	0	321
Deferred financing costs		-1,344	-2,325
Other	-9	0	-89
Net cash used by financing activities	-131,780	-164,375	-169,239
Increase (decrease) for the year	1,381	624	-2,444
Beginning of period	1,447	823	3,267
End of period	2,828	1,447	823
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	19,398	20,007	1,039
Cash flows from investing activities
Additions to properties and equipment	-8,201	-7,016	-14,727
Proceeds from sale of assets		0
Distributions from UNEV	0	0
Distributions in Excess of Equity in Earnings in SLC Pipeline	0	0	0
Net Cash Provided by (Used in) Investing Activities	-8,201	-7,016	-14,727
Cash flows from financing activities
Proceeds from (Repayments of) Lines of Credit	0	0	0
Proceeds from issuance of senior notes			0
Net Intercompany Financing Activities	0	0	0
Cash distribution to HFC for UNEV acquisition			0
Proceeds from issuance of common units		0
Repayments of senior notes	0		0
Contributions from noncontrolling interests			15,000
Distributions to HEP unitholders	0	0	0
Distributions to noncontrolling interest	-16,100	12,500
Contribution from general partner		0	0
Purchase of units for incentive grants	0	0	0
Deferred financing costs		0	0
Other	0	0	0
Net cash used by financing activities	-16,100	-12,500	15,000
Increase (decrease) for the year	-4,903	491	1,312
Beginning of period	4,903	4,412	3,100
End of period	0	4,903	4,412
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	-692	0	0
Cash flows from investing activities
Additions to properties and equipment	0	0	0
Proceeds from sale of assets		0
Distributions from UNEV	-11,383	-9,375
Distributions in Excess of Equity in Earnings in SLC Pipeline	0	0	0
Net Cash Provided by (Used in) Investing Activities	-11,383	-9,375	0
Cash flows from financing activities
Proceeds from (Repayments of) Lines of Credit	0	0	0
Proceeds from issuance of senior notes			0
Net Intercompany Financing Activities	0	0	0
Cash distribution to HFC for UNEV acquisition			0
Proceeds from issuance of common units		0
Repayments of senior notes	0		0
Contributions from noncontrolling interests			0
Distributions to HEP unitholders	0	0	0
Distributions to noncontrolling interest	12,075	-9,375
Contribution from general partner		0	0
Purchase of units for incentive grants	0	0	0
Deferred financing costs		0	0
Other	0	0	0
Net cash used by financing activities	12,075	9,375	0
Increase (decrease) for the year	0	0	0
Beginning of period	0	0	0
End of period	$0	$0	$0