Holly Energy Partners (HEP) 10-Q 5 Aug 15 2015 Q2 Quarterly report Financial data

Document Entity Information

Document Entity Information - Jun. 30, 2015 - shares	Total
Entity Information [Line Items]
Entity Registrant Name	HOLLY ENERGY PARTNERS LP
Entity Central Index Key	1,283,140
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	58,657,048

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 10,424	$ 2,830
Accounts receivable:
Trade	11,286	6,737
Affiliates	28,758	33,392
Total accounts receivable	40,044	40,129
Prepaid and other current assets	4,738	4,383
Total current assets	55,206	47,342
Properties and equipment, net	1,000,808	980,479
Transportation agreements, net	77,279	80,703
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,280	24,478
Other assets	11,172	12,055
Total assets	1,425,243	1,401,555
Accounts payable:
Trade	8,317	12,642
Affiliates	7,811	5,239
Total accounts payable	16,128	17,881
Accrued interest	6,783	6,615
Deferred revenue	9,940	12,432
Accrued property taxes	4,335	2,703
Other current liabilities	4,826	4,571
Total current liabilities	42,012	44,202
Long-term debt	900,905	867,579
Other long-term liabilities	21,132	18,145
Deferred revenue	35,484	29,392
Class B unit	30,305	26,793
Partners’ equity:
Common unitholders (58,657,048 units issued and outstanding at June 30, 2015 and December 31, 2014	441,224	468,813
General partner interest (2% interest)	(139,711)	(148,405)
Accumulated other comprehensive loss	(573)	(46)
Total partners’ equity	300,940	320,362
Noncontrolling interest	94,465	95,082
Total Equity	395,405	415,444
Total liabilities and equity	$ 1,425,243	$ 1,401,555

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
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 Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Affiliates	$ 68,297	$ 64,480	$ 140,552	$ 136,312
Third parties	15,182	10,518	32,683	25,690
Total revenues	83,479	74,998	173,235	162,002
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)	25,289	24,567	53,255	47,379
Depreciation and amortization	15,063	15,882	29,757	31,470
General and administrative	2,696	2,516	5,986	5,667
Total operating costs and expenses	43,048	42,965	88,998	84,516
Operating income	40,431	32,033	84,237	77,486
Other income (expense):
Equity in earnings of SLC Pipeline	631	748	1,365	1,270
Interest expense	(9,056)	(8,329)	(17,824)	(18,783)
Interest income	3	0	3	3
Loss on early extinguishment of debt	0	0	0	(7,677)
Other income	71	26	230	34
Total other income (expense)	(8,351)	(7,555)	(16,226)	(25,153)
Income before income taxes	32,080	24,478	68,011	52,333
State income tax expense (benefit)	64	(28)	(37)	(103)
Net Income	32,144	24,450	67,974	52,230
Allocation of Net Income Attributable to Noncontrolling Interest	(1,743)	(1,416)	(5,770)	(5,053)
Net income attributable to Holly Energy Partners	30,401	23,034	62,204	47,177
General partner interest in net income, including incentive distributions	(10,196)	(8,393)	(20,006)	(16,394)
Limited partners’ interest in net income	$ 20,205	$ 14,641	$ 42,198	$ 30,783
Limited partners’ per unit interest in earnings—basic and diluted:	$ 0.34	$ 0.25	$ 0.71	$ 0.52
Weighted average limited partners’ units outstanding	58,657	58,657	58,657	58,657

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 32,144	$ 24,450	$ 67,974	$ 52,230
Other comprehensive income:
Change in fair value of cash flow hedging instruments	(306)	(1,299)	(1,586)	(1,742)
Reclassification adjustment to net income on partial settlement of cash flow hedge	528	553	1,059	1,091
Other comprehensive income (loss)	222	(746)	(527)	(651)
Comprehensive income before noncontrolling interest	32,366	23,704	67,447	51,579
Allocation of comprehensive income to noncontrolling interests	(1,743)	(1,416)	(5,770)	(5,053)
Comprehensive income attributable to Holly Energy Partners	$ 30,623	$ 22,288	$ 61,677	$ 46,526

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income	$ 67,974	$ 52,230
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,757	31,470
Gain on sale of assets	(209)	0
Amortization of deferred charges	930	947
Amortization of restricted and performance units	1,762	1,658
Loss on early extinguishment of debt	0	7,677
(Increase) decrease in operating assets:
Accounts receivable – trade	(4,514)	(1,446)
Accounts receivable – affiliates	5,064	1,823
Prepaid and other current assets	(311)	128
Increase (decrease) in operating liabilities:
Accounts payable – trade	(1,610)	1,280
Accounts payable – affiliates	2,573	(4,495)
Accrued interest	168	(3,552)
Deferred revenue	3,600	2,315
Accrued property taxes	1,632	1,912
Other current liabilities	(242)	1,153
Other, net	3,890	(737)
Net cash provided by operating activities	110,464	92,363
Cash flows from investing activities
Additions to properties and equipment	(22,943)	(38,574)
Purchase of equipment	(27,500)	0
Proceeds from sale of assets	965	0
Distributions in excess of equity in earnings of SLC Pipeline	198	105
Net cash used for investing activities	(49,280)	(38,469)
Cash flows from financing activities
Borrowings under credit agreement	254,100	477,100
Repayments of credit agreement borrowings	(221,100)	(297,100)
Redemption of senior notes	0	(156,188)
Distributions to HEP unitholders	(82,614)	(75,577)
Distributions to noncontrolling interests	(2,875)	(2,000)
Purchase of units for incentive grants	(247)	(406)
Other	(854)	(9)
Net cash used for financing activities	(53,590)	(54,180)
Cash and cash equivalents
Increase (decrease) for the period	7,594	(286)
Beginning of period	2,830	6,352
End of period	$ 10,424	$ 6,066

Consolidated Statement of Partn

Consolidated Statement of Partners' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Units	General Partner Interest	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance December 31, 2014 at Dec. 31, 2014	$ 415,444	$ 468,813	$ (148,405)	$ (46)	$ 95,082
Increase (Decrease) in Partners' Equity [Roll Forward]
Distributions to HEP unitholders	(82,614)	(62,612)	(20,002)
Distributions to Noncontrolling Interest	(2,875)				(2,875)
Purchase of units for incentive grants	(247)	(247)
Amortization of restricted and performance units	1,762	1,762
Class B unit accretion	(3,512)	(3,442)	(70)
Net income	67,974	36,950	28,766		2,258
Other comprehensive income	(527)			(527)
Balance June 30, 2015 at Jun. 30, 2015	$ 395,405	$ 441,224	$ (139,711)	$ (573)	$ 94,465

Description of Business and Pre

Description of Business and Presentation of Financial Statements	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Description of Business and Presentation of Financial Statements	Description of Business and Presentation of Financial Statements 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 operation. 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 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. The consolidated financial statements included herein have been prepared without audit, pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). The interim financial statements reflect all adjustments, which, in the opinion of management, are necessary for a fair presentation of our results for the interim periods. Such adjustments are considered to be of a normal recurring nature. Although certain notes and other information required by U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted, we believe that the disclosures in these consolidated financial statements are adequate to make the information presented not misleading. These consolidated financial statements should be read in conjunction with our Form 10-K for the year ended December 31, 2014 . Results of operations for interim periods are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2015 . 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 has an effective date of January 1, 2018. We are evaluating the impact of this standard. Debt Issuance Costs In April 2015, an accounting standard update was issued requiring debt issuance costs to be presented as a direct deduction from the carrying amount of the debt liability. The amount of deferred debt issuance costs reported in Long-term assets was $4.7 million and $4.4 million as of June 30, 2015 and December 31, 2014, respectively. This standard will become effective beginning with our 2016 reporting year.

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2015
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: June 30, 2015 December 31, 2014 Financial Instrument Fair Value Input Level Carrying Value Fair Value Carrying Value Fair Value (In thousands) Assets: Interest rate swaps Level 2 $ 134 $ 134 $ 1,019 $ 1,019 Liabilities: 6.5% Senior notes Level 2 $ 296,905 $ 295,875 $ 296,579 $ 291,000 Interest rate swaps Level 2 707 707 1,065 1,065 $ 297,612 $ 296,582 $ 297,644 $ 292,065 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 6 for additional information on these instruments.

Properties and Equipment

Properties and Equipment	6 Months Ended
	Jun. 30, 2015
Property, Plant and Equipment [Abstract]
Properties and Equipment	Properties and Equipment The carrying amounts of our properties and equipment are as follows: June 30, December 31, (In thousands) Pipelines, terminals and tankage $ 1,180,313 $ 1,137,157 Land and right of way 65,025 64,458 Construction in progress 57,258 56,228 Other 22,646 22,636 1,325,242 1,280,479 Less accumulated depreciation 324,434 300,000 $ 1,000,808 $ 980,479 On March 6, 2015, we completed the acquisition of an existing crude tank farm adjacent to HFC's El Dorado Refinery from an unrelated third-party for $27.5 million in cash. We recorded the assets acquired and liabilities assumed at their fair values at the date of acquisition based on preliminary valuations. Substantially all of the purchase price was allocated to properties and equipment and no goodwill has been recorded. We expect to finalize the purchase price allocation during the third quarter of 2015. HFC is the main customer of this crude tank farm. We capitalized $0.6 million and $0.9 million in interest attributable to construction projects during the six months ended June 30, 2015 and 2014 , respectively. Depreciation expense was $26.0 million and $27.8 million for the six months ended June 30, 2015 and 2014 , respectively.

Transportation Agreements

Transportation Agreements	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [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: June 30, December 31, (In thousands) Alon transportation agreement $ 59,933 $ 59,933 HFC transportation agreement 74,231 74,231 Other 50 — 134,214 134,164 Less accumulated amortization 56,935 53,461 $ 77,279 $ 80,703 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	6 Months Ended
	Jun. 30, 2015
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 $1.7 million and $1.9 million for the three months ended June 30, 2015 and 2014 , respectively, and $3.1 million and $3.6 million for the six months ended June 30, 2015 and 2014 , 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. As of June 30, 2015 , we have three types of incentive-based awards outstanding, which are described below. The compensation cost charged against income was $0.9 million and $0.8 million for the three months ended June 30, 2015 and 2014 , respectively, and $1.6 million for each of the the six months ended June 30, 2015 and 2014 . 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 June 30, 2015 , 2,500,000 units were authorized to be granted under our Long-Term Incentive Plan, of which 1,537,167 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 and phantom unit activity and changes during the six months ended June 30, 2015 , is presented below: Restricted and Phantom Units Units Weighted Average Grant-Date Fair Value Outstanding at January 1, 2015 (nonvested) 126,077 $ 33.43 Forfeited (2,849 ) 33.57 Outstanding at June 30, 2015 (nonvested) 123,228 $ 33.42 As of June 30, 2015 , there was $1.7 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 1.2 years. 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. As of June 30, 2015 , estimated unit payouts for outstanding nonvested performance unit awards ranged between 100% and 140% . No performance units were granted during the six months ended June 30, 2015 . Performance units granted in 2014 vest over a three-year performance period ending December 31, 2017. These 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. A summary of performance unit activity and changes during the six months ended June 30, 2015 , is presented below: Performance Units Units Outstanding at January 1, 2015 (nonvested) 71,245 Vesting and transfer of common units to recipients (11,436 ) Outstanding at June 30, 2015 (nonvested) 59,809 The grant-date fair value of performance units vested and transferred to recipients during the six months ended June 30, 2015 , was $0.3 million . Based on the weighted average fair value of performance units outstanding at June 30, 2015 , of $2.2 million , there was $0.8 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.

Debt

Debt	6 Months Ended
	Jun. 30, 2015
Debt Instruments [Abstract]
Debt	Debt Credit Agreement In April 2015, we amended our senior secured revolving credit facility (the “Credit Agreement”) increasing the size of the Credit Agreement from $650 million to $850 million . The Credit Agreement 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. 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 We have $300 million in aggregate principal amount outstanding of 6.5% senior notes (the "6.5% Senior Notes") maturing March 2020. 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. 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. Indebtedness under the 6.5% Senior Notes involves 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. Long-term Debt The carrying amounts of our long-term debt are as follows: June 30, December 31, (In thousands) Credit Agreement $ 604,000 $ 571,000 6.5% Senior Notes Principal 300,000 300,000 Unamortized discount (3,095 ) (3,421 ) 296,905 296,579 Total long-term debt $ 900,905 $ 867,579 Interest Rate Risk Management We use interest rate swaps (derivative instruments) to manage our exposure to interest rate risk. As of June 30, 2015 , 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 June 30, 2015 , which equaled an effective interest rate of 2.99% . This swap contract matures in February 2016. We 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 June 30, 2015 , 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 June 30, 2015 , we had no ineffectiveness on our cash flow hedges. At June 30, 2015 , we have accumulated other comprehensive loss of $0.6 million that relates to our current cash flow hedging instruments. Approximately $0.6 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) June 30, 2015 Interest rate swaps designated as cash flow hedging instrument: Variable-to-fixed interest rate swap contract ($155 million of LIBOR-based debt interest) Other current liabilities $ (707 ) Accumulated other comprehensive loss $ (707 ) Variable-to-fixed interest rate swap contracts ($150 million of LIBOR-based debt interest) Other long-term assets 134 Accumulated other 134 $ (573 ) $ (573 ) 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 liabilities $ (1,065 ) Accumulated other comprehensive loss $ (1,065 ) Variable-to-fixed interest rate swap contracts ($150 million of LIBOR-based debt interest) Other long-term assets 1,019 Accumulated other 1,019 $ (46 ) $ (46 ) Interest Expense and Other Debt Information Interest expense consists of the following components: Six Months Ended June 30, 2015 2014 (In thousands) Interest on outstanding debt: Credit Agreement, net of interest on interest rate swaps $ 7,488 $ 6,165 6.5% Senior Notes 9,757 9,696 8.25% Senior Notes — 2,544 Amortization of discount and deferred debt issuance costs 930 948 Commitment fees 261 293 Total interest incurred 18,436 19,646 Less capitalized interest 612 863 Net interest expense $ 17,824 $ 18,783 Cash paid for interest $ 17,280 $ 22,249

Significant Customers

Significant Customers	6 Months Ended
	Jun. 30, 2015
Risks and Uncertainties [Abstract]
Significant Customers	Significant Customers All revenues are domestic revenues, of which 92% 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: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 HFC 82 % 86 % 81 % 84 % Alon 10 % 7 % 10 % 9 %

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 , these agreements with HFC will result in minimum annual payments to us of $236.6 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 (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 $68.3 million and $64.5 million for the three months ended June 30, 2015 and 2014 , respectively, and $140.6 million and $136.3 million for the six months ended June 30, 2015 and 2014 , respectively. • HFC charged us general and administrative services under the Omnibus Agreement of $0.6 million for each of the three months ended June 30, 2015 and 2014 , and $1.2 million for each of the six months ended June 30, 2015 and 2014 . • We reimbursed HFC for costs of employees supporting our operations of $7.5 million and $9.6 million for the three months ended June 30, 2015 and 2014 , respectively, and $16.2 million and $18.8 million for the six months ended June 30, 2015 and 2014 , respectively. • HFC reimbursed us $4.4 million and $3.9 million for the three months ended June 30, 2015 and 2014 , respectively, for certain reimbursable costs and capital projects and $7.0 million and $8.4 million for the six months ended June 30, 2015 and 2014 , respectively. • We distributed $22.3 million and $19.8 million for the three months ended June 30, 2015 and 2014 , respectively, to HFC as regular distributions on its common units and general partner interest, including general partner incentive distributions. For the six months ended June 30, 2015 and 2014 , we distributed $43.9 million and $39.0 million , respectively • Accounts receivable from HFC were $28.8 million and $33.4 million at June 30, 2015 , and December 31, 2014 , respectively. • Accounts payable to HFC were $7.8 million and $5.2 million at June 30, 2015 , and December 31, 2014 , respectively. • Revenues for the six months ended June 30, 2015 and 2014 , include $6.0 million and $7.6 million , respectively, of shortfall payments billed in 2014 and 2013, as HFC did not exceed its minimum volume commitment in any of the subsequent four quarters. Deferred revenue in the consolidated balance sheets at June 30, 2015 , and December 31, 2014 , includes $5.4 million and $7.3 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 $5.4 million deferred at June 30, 2015 .

Partners' Equity

Partners' Equity	6 Months Ended
	Jun. 30, 2015
Partners' Capital [Abstract]
Partners' Equity	Partners’ Equity As of June 30, 2015 , HFC held 22,380,030 of our common units and the 2% general partner interest, which together constituted a 39% ownership interest in us. 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: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (In thousands) General partner interest in net income $ 412 $ 299 $ 861 $ 628 General partner incentive distribution 9,784 8,094 19,145 15,766 Total general partner interest in net income $ 10,196 $ 8,393 $ 20,006 $ 16,394 In addition to the allocation of net income as presented above, the consolidated statement of partners equity for the six months ended June 30, 2015, reflects a cumulative revision of net income allocations between the general partnership interest and common units of approximately $8.8 million for net income related to years ended 2014 and prior. This revision had no impact on historical limited partners’ per unit interest in earnings. Cash Distributions Our general partner, HEP Logistics, is entitled to incentive distributions if the amount we distribute with respect to any quarter exceeds specified target levels. On July 23, 2015 , we announced our cash distribution for the second quarter of 2015 of $0.5450 per unit. The distribution is payable on all common and general partner units and will be paid August 14, 2015 , to all unitholders of record on August 3, 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. Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (In thousands, except per unit data) General partner interest in distribution $ 877 $ 807 $ 1,738 $ 1,597 General partner incentive distribution 9,784 8,094 19,145 15,766 Total general partner distribution 10,661 8,901 20,883 17,363 Limited partner distribution 31,968 30,209 63,496 59,977 Total regular quarterly cash distribution $ 42,629 $ 39,110 $ 84,379 $ 77,340 Cash distribution per unit applicable to limited partners $ 0.5450 $ 0.5150 $ 1.0825 $ 1.0225 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.

Environmental Loss Contingencie

Environmental Loss Contingencies	6 Months Ended
	Jun. 30, 2015
Accrual for Environmental Loss Contingencies [Abstract]
Environmental [Text Block]	Environmental We incurred no environmental expense for the three months ended June 30, 2015 , and $0.9 million for environmental remediation obligations for the three months ended June 30, 2014 . For the six months ended June 30, 2015 and 2014 , we incurred environmental expenses of $4.2 million and $0.7 million , respectively. During the six months ended June 30, 2015 , we increased certain environmental cost accruals to reflect revisions to the cost estimates and the time frame for which the related environmental remediation and monitoring activities are expected to occur. The accrued environmental liability reflected in our consolidated balance sheets was $15.3 million and $12.0 million at June 30, 2015 and December 31, 2014 , respectively, of which $12.3 million and $8.7 million , respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time. 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 and occurring or existing prior to the date of such transfers. As of June 30, 2015 , and December 31, 2014 , our accrued environmental liability included $6.6 million and $6.8 million , respectively, for HFC indemnified liabilities. In addition, as of June 30, 2015 , and December 31, 2014 , $6.6 million and $6.8 million , respectively, was included in other assets representing amounts due from HFC related to indemnifications for environmental remediation liabilities.

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies 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 operation or cash flows.

Supplemental Guarantor _ Non-Gu

Supplemental Guarantor / Non-Guarantor Financial Information	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ — $ 7,350 $ 3,074 $ — $ 10,424 Accounts receivable 2 35,771 4,442 (171 ) 40,044 Prepaid and other current assets 82 3,395 1,261 — 4,738 Total current assets 84 46,516 8,777 (171 ) 55,206 Properties and equipment, net — 624,509 376,299 — 1,000,808 Investment in subsidiaries 603,118 283,393 — (886,511 ) — Transportation agreements, net — 77,279 — — 77,279 Goodwill — 256,498 — — 256,498 Investment in SLC Pipeline — 24,280 — — 24,280 Other assets 1,344 9,828 — — 11,172 Total assets $ 604,546 $ 1,322,303 $ 385,076 $ (886,682 ) $ 1,425,243 LIABILITIES AND PARTNERS’ EQUITY Current liabilities: Accounts payable $ — $ 15,343 $ 956 $ (171 ) $ 16,128 Accrued interest 6,500 283 — — 6,783 Deferred revenue — 6,440 3,500 — 9,940 Accrued property taxes — 1,739 2,596 — 4,335 Other current liabilities 24 4,801 1 — 4,826 Total current liabilities 6,524 28,606 7,053 (171 ) 42,012 Long-term debt 296,905 604,000 — — 900,905 Other long-term liabilities 177 20,790 165 — 21,132 Deferred revenue — 35,484 — — 35,484 Class B unit — 30,305 — — 30,305 Equity - partners 300,940 603,118 377,858 (980,976 ) 300,940 Equity - noncontrolling interest — — — 94,465 94,465 Total liabilities and partners’ equity $ 604,546 $ 1,322,303 $ 385,076 $ (886,682 ) $ 1,425,243 Condensed Consolidating Balance Sheet December 31, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (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 Statement of Comprehensive Income Three Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 64,727 $ 3,545 $ 25 $ 68,297 Third parties — 11,895 3,287 — 15,182 — 76,622 6,832 25 83,479 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 22,111 3,153 25 25,289 Depreciation and amortization 11,316 3,747 — 15,063 General and administrative 637 2,059 — — 2,696 637 35,486 6,900 25 43,048 Operating income (loss) (637 ) 41,136 (68 ) — 40,431 Equity in earnings (loss) of subsidiaries 36,111 (88 ) — (36,023 ) — Equity in earnings of SLC Pipeline — 631 — — 631 Interest expense (5,073 ) (3,983 ) — — (9,056 ) Interest income — 3 — — 3 Other income (expense) — 120 (49 ) — 71 31,038 (3,317 ) (49 ) (36,023 ) (8,351 ) Income (loss) before income taxes 30,401 37,819 (117 ) (36,023 ) 32,080 State income tax benefit — 64 — — 64 Net income (loss) 30,401 37,883 (117 ) (36,023 ) 32,144 Allocation of net income attributable to noncontrolling interests — — — (1,743 ) (1,743 ) Net income (loss) attributable to Holly Energy Partners 30,401 37,883 (117 ) (37,766 ) 30,401 Other comprehensive income (loss) 222 222 — (222 ) 222 Comprehensive income (loss) $ 30,623 $ 38,105 $ (117 ) $ (37,988 ) $ 30,623 Condensed Consolidating Statement of Comprehensive Income Three Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 61,427 $ 3,359 $ (306 ) $ 64,480 Third parties — 8,533 1,985 — 10,518 — 69,960 5,344 (306 ) 74,998 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 22,179 2,694 (306 ) 24,567 Depreciation and amortization — 12,288 3,594 — 15,882 General and administrative 585 1,931 — — 2,516 585 36,398 6,288 (306 ) 42,965 Operating income (loss) (585 ) 33,562 (944 ) — 32,033 Equity in earnings (loss) of subsidiaries 28,631 (708 ) — (27,923 ) — Equity in earnings of SLC Pipeline — 748 — — 748 Interest expense (5,012 ) (3,317 ) — — (8,329 ) Other income — 26 — — 26 23,619 (3,251 ) — (27,923 ) (7,555 ) Income (loss) before income taxes 23,034 30,311 (944 ) (27,923 ) 24,478 State income tax expense — (28 ) — — (28 ) Net income (loss) 23,034 30,283 (944 ) (27,923 ) 24,450 Allocation of net income attributable to noncontrolling interests — — — (1,416 ) (1,416 ) Net income (loss) attributable to Holly Energy Partners 23,034 30,283 (944 ) (29,339 ) 23,034 Other comprehensive income (loss) (746 ) (746 ) — 746 (746 ) Comprehensive income (loss) $ 22,288 $ 29,537 $ (944 ) $ (28,593 ) $ 22,288 Condensed Consolidating Statement of Comprehensive Income Six Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 127,783 $ 12,769 $ — $ 140,552 Third parties — 23,282 9,401 — 32,683 — 151,065 22,170 — 173,235 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 47,642 5,613 — 53,255 Depreciation and amortization — 22,278 7,479 — 29,757 General and administrative 1,700 4,286 — — 5,986 1,700 74,206 13,092 — 88,998 Operating income (loss) (1,700 ) 76,859 9,078 — 84,237 Equity in earnings (loss) of subsidiaries 74,044 6,772 — (80,816 ) — Equity in earnings of SLC Pipeline — 1,365 — — 1,365 Interest expense (10,140 ) (7,684 ) — — (17,824 ) Interest income — 3 — — 3 Other income (expense) — 279 (49 ) — 230 63,904 735 (49 ) (80,816 ) (16,226 ) Income (loss) before income taxes 62,204 77,594 9,029 (80,816 ) 68,011 State income tax expense — (37 ) — — (37 ) Net income (loss) 62,204 77,557 9,029 (80,816 ) 67,974 Allocation of net income attributable to noncontrolling interests — — — (5,770 ) (5,770 ) Net income (loss) attributable to Holly Energy Partners 62,204 77,557 9,029 (86,586 ) 62,204 Other comprehensive income (loss) (527 ) (527 ) — 527 (527 ) Comprehensive income (loss) $ 61,677 $ 77,030 $ 9,029 $ (86,059 ) $ 61,677 Condensed Consolidating Statement of Comprehensive Income Six Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 123,042 $ 13,883 $ (613 ) $ 136,312 Third parties — 19,614 6,076 — 25,690 — 142,656 19,959 (613 ) 162,002 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 42,330 5,662 (613 ) 47,379 Depreciation and amortization — 24,281 7,189 — 31,470 General and administrative 1,643 4,024 — — 5,667 1,643 70,635 12,851 (613 ) 84,516 Operating income (loss) (1,643 ) 72,021 7,108 — 77,486 Equity in earnings (loss) of subsidiaries 69,195 5,331 — (74,526 ) — Equity in earnings of SLC Pipeline — 1,270 — — 1,270 Interest expense (12,698 ) (6,085 ) — — (18,783 ) Interest income — 3 — — 3 Loss on early extinguishment of debt (7,677 ) — — — (7,677 ) Other income — 34 — — 34 48,820 553 — (74,526 ) (25,153 ) Income (loss) before income taxes 47,177 72,574 7,108 (74,526 ) 52,333 State income tax expense — (103 ) — — (103 ) Net income (loss) 47,177 72,471 7,108 (74,526 ) 52,230 Allocation of net income attributable to noncontrolling interests — — — (5,053 ) (5,053 ) Net income (loss) attributable to Holly Energy Partners 47,177 72,471 7,108 (79,579 ) 47,177 Other comprehensive income (loss) (651 ) (651 ) — 651 (651 ) Comprehensive income (loss) $ 46,526 $ 71,820 $ 7,108 $ (78,928 ) $ 46,526 Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (9,639 ) $ 111,517 $ 15,358 $ (6,772 ) $ 110,464 Cash flows from investing activities Additions to properties and equipment — (22,159 ) (784 ) — (22,943 ) Purchase of El Dorado crude tanks — (27,500 ) — — (27,500 ) Proceeds from sale of assets — 965 — — 965 Distributions from UNEV — 1,853 — (1,853 ) — Distributions in excess of equity in earnings in SLC Pipeline — 198 — — 198 — (46,643 ) (784 ) (1,853 ) (49,280 ) Cash flows from financing activities Net borrowings under credit agreement — 33,000 — — 33,000 Net intercompany financing activities 92,498 (92,498 ) — — — Distributions to HEP unitholders (82,614 ) — — — (82,614 ) Distributions to noncontrolling interests — — (11,500 ) 8,625 (2,875 ) Purchase of units for incentive grants (247 ) — — — (247 ) Other — (854 ) — — (854 ) 9,637 (60,352 ) (11,500 ) 8,625 (53,590 ) Cash and cash equivalents Increase (decrease) for the period (2 ) 4,522 3,074 — 7,594 Beginning of period 2 2,828 — — 2,830 End of period $ — $ 7,350 $ 3,074 $ — $ 10,424 Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (15,764 ) $ 96,308 $ 11,819 $ — $ 92,363 Cash flows from investing activities Additions to properties and equipment — (33,831 ) (4,743 ) — (38,574 ) Distributions from noncontrolling interest — 6,000 — (6,000 ) — Distributions in excess of equity in earnings of SLC Pipeline — 105 — — 105 — (27,726 ) (4,743 ) (6,000 ) (38,469 ) Cash flows from financing activities Net repayments under credit agreement — 180,000 — — 180,000 Net intercompany financing activities 247,935 (247,935 ) — — — Redemption of senior notes (156,188 ) — — — (156,188 ) Distributions to HEP unitholders (75,577 ) — — — (75,577 ) Distributions to noncontrolling interests — — (8,000 ) 6,000 (2,000 ) Purchase of units for incentive grants (406 ) — — — (406 ) Other — (9 ) — — (9 ) 15,764 (67,944 ) (8,000 ) 6,000 (54,180 ) Cash and cash equivalents Increase (decrease) for the period — 638 (924 ) — (286 ) Beginning of period 2 1,447 4,903 — 6,352 End of period $ 2 $ 2,085 $ 3,979 $ — $ 6,066

Description of Business and P20

Description of Business and Presentation of Financial Statements Accounting Policy Descriptions (Policies)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	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 has an effective date of January 1, 2018. We are evaluating the impact of this standard. Debt Issuance Costs In April 2015, an accounting standard update was issued requiring debt issuance costs to be presented as a direct deduction from the carrying amount of the debt liability. The amount of deferred debt issuance costs reported in Long-term assets was $4.7 million and $4.4 million as of June 30, 2015 and December 31, 2014, respectively. This standard will become effective beginning with our 2016 reporting year.

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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: June 30, 2015 December 31, 2014 Financial Instrument Fair Value Input Level Carrying Value Fair Value Carrying Value Fair Value (In thousands) Assets: Interest rate swaps Level 2 $ 134 $ 134 $ 1,019 $ 1,019 Liabilities: 6.5% Senior notes Level 2 $ 296,905 $ 295,875 $ 296,579 $ 291,000 Interest rate swaps Level 2 707 707 1,065 1,065 $ 297,612 $ 296,582 $ 297,644 $ 292,065

Properties and Equipment (Table

Properties and Equipment (Tables)	6 Months Ended
	Jun. 30, 2015
Property, Plant and Equipment [Abstract]
Properties and Equipment	The carrying amounts of our properties and equipment are as follows: June 30, December 31, (In thousands) Pipelines, terminals and tankage $ 1,180,313 $ 1,137,157 Land and right of way 65,025 64,458 Construction in progress 57,258 56,228 Other 22,646 22,636 1,325,242 1,280,479 Less accumulated depreciation 324,434 300,000 $ 1,000,808 $ 980,479

Transportation Agreements (Tabl

Transportation Agreements (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets by Major Class	The carrying amounts of our transportation agreements are as follows: June 30, December 31, (In thousands) Alon transportation agreement $ 59,933 $ 59,933 HFC transportation agreement 74,231 74,231 Other 50 — 134,214 134,164 Less accumulated amortization 56,935 53,461 $ 77,279 $ 80,703

Employees, Retirement and Inc24

Employees, Retirement and Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	A summary of restricted and phantom unit activity and changes during the six months ended June 30, 2015 , is presented below: Restricted and Phantom Units Units Weighted Average Grant-Date Fair Value Outstanding at January 1, 2015 (nonvested) 126,077 $ 33.43 Forfeited (2,849 ) 33.57 Outstanding at June 30, 2015 (nonvested) 123,228 $ 33.42
Schedule of Nonvested Performance-based Units Activity	A summary of performance unit activity and changes during the six months ended June 30, 2015 , is presented below: Performance Units Units Outstanding at January 1, 2015 (nonvested) 71,245 Vesting and transfer of common units to recipients (11,436 ) Outstanding at June 30, 2015 (nonvested) 59,809

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Instruments [Abstract]
Schedule of Long-term Debt Instruments	The carrying amounts of our long-term debt are as follows: June 30, December 31, (In thousands) Credit Agreement $ 604,000 $ 571,000 6.5% Senior Notes Principal 300,000 300,000 Unamortized discount (3,095 ) (3,421 ) 296,905 296,579 Total long-term debt $ 900,905 $ 867,579
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) June 30, 2015 Interest rate swaps designated as cash flow hedging instrument: Variable-to-fixed interest rate swap contract ($155 million of LIBOR-based debt interest) Other current liabilities $ (707 ) Accumulated other comprehensive loss $ (707 ) Variable-to-fixed interest rate swap contracts ($150 million of LIBOR-based debt interest) Other long-term assets 134 Accumulated other 134 $ (573 ) $ (573 ) 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 liabilities $ (1,065 ) Accumulated other comprehensive loss $ (1,065 ) Variable-to-fixed interest rate swap contracts ($150 million of LIBOR-based debt interest) Other long-term assets 1,019 Accumulated other 1,019 $ (46 ) $ (46 )
Schedule of Interest Expense and Other Debt Information	Interest expense consists of the following components: Six Months Ended June 30, 2015 2014 (In thousands) Interest on outstanding debt: Credit Agreement, net of interest on interest rate swaps $ 7,488 $ 6,165 6.5% Senior Notes 9,757 9,696 8.25% Senior Notes — 2,544 Amortization of discount and deferred debt issuance costs 930 948 Commitment fees 261 293 Total interest incurred 18,436 19,646 Less capitalized interest 612 863 Net interest expense $ 17,824 $ 18,783 Cash paid for interest $ 17,280 $ 22,249

Significant Customers (Tables)

Significant Customers (Tables)	6 Months Ended
	Jun. 30, 2015
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: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 HFC 82 % 86 % 81 % 84 % Alon 10 % 7 % 10 % 9 %

Partners' Equity (Tables)

Partners' Equity (Tables)	6 Months Ended
	Jun. 30, 2015
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: Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (In thousands) General partner interest in net income $ 412 $ 299 $ 861 $ 628 General partner incentive distribution 9,784 8,094 19,145 15,766 Total general partner interest in net income $ 10,196 $ 8,393 $ 20,006 $ 16,394
Schedule of Distributions Made to Members or Limited Partners	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. Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (In thousands, except per unit data) General partner interest in distribution $ 877 $ 807 $ 1,738 $ 1,597 General partner incentive distribution 9,784 8,094 19,145 15,766 Total general partner distribution 10,661 8,901 20,883 17,363 Limited partner distribution 31,968 30,209 63,496 59,977 Total regular quarterly cash distribution $ 42,629 $ 39,110 $ 84,379 $ 77,340 Cash distribution per unit applicable to limited partners $ 0.5450 $ 0.5150 $ 1.0825 $ 1.0225

Supplemental Guarantor _ Non-28

Supplemental Guarantor / Non-Guarantor Financial Information (Tables)	6 Months Ended
	Jun. 30, 2015
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ — $ 7,350 $ 3,074 $ — $ 10,424 Accounts receivable 2 35,771 4,442 (171 ) 40,044 Prepaid and other current assets 82 3,395 1,261 — 4,738 Total current assets 84 46,516 8,777 (171 ) 55,206 Properties and equipment, net — 624,509 376,299 — 1,000,808 Investment in subsidiaries 603,118 283,393 — (886,511 ) — Transportation agreements, net — 77,279 — — 77,279 Goodwill — 256,498 — — 256,498 Investment in SLC Pipeline — 24,280 — — 24,280 Other assets 1,344 9,828 — — 11,172 Total assets $ 604,546 $ 1,322,303 $ 385,076 $ (886,682 ) $ 1,425,243 LIABILITIES AND PARTNERS’ EQUITY Current liabilities: Accounts payable $ — $ 15,343 $ 956 $ (171 ) $ 16,128 Accrued interest 6,500 283 — — 6,783 Deferred revenue — 6,440 3,500 — 9,940 Accrued property taxes — 1,739 2,596 — 4,335 Other current liabilities 24 4,801 1 — 4,826 Total current liabilities 6,524 28,606 7,053 (171 ) 42,012 Long-term debt 296,905 604,000 — — 900,905 Other long-term liabilities 177 20,790 165 — 21,132 Deferred revenue — 35,484 — — 35,484 Class B unit — 30,305 — — 30,305 Equity - partners 300,940 603,118 377,858 (980,976 ) 300,940 Equity - noncontrolling interest — — — 94,465 94,465 Total liabilities and partners’ equity $ 604,546 $ 1,322,303 $ 385,076 $ (886,682 ) $ 1,425,243 Condensed Consolidating Balance Sheet December 31, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (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 Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive Income Three Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 64,727 $ 3,545 $ 25 $ 68,297 Third parties — 11,895 3,287 — 15,182 — 76,622 6,832 25 83,479 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 22,111 3,153 25 25,289 Depreciation and amortization 11,316 3,747 — 15,063 General and administrative 637 2,059 — — 2,696 637 35,486 6,900 25 43,048 Operating income (loss) (637 ) 41,136 (68 ) — 40,431 Equity in earnings (loss) of subsidiaries 36,111 (88 ) — (36,023 ) — Equity in earnings of SLC Pipeline — 631 — — 631 Interest expense (5,073 ) (3,983 ) — — (9,056 ) Interest income — 3 — — 3 Other income (expense) — 120 (49 ) — 71 31,038 (3,317 ) (49 ) (36,023 ) (8,351 ) Income (loss) before income taxes 30,401 37,819 (117 ) (36,023 ) 32,080 State income tax benefit — 64 — — 64 Net income (loss) 30,401 37,883 (117 ) (36,023 ) 32,144 Allocation of net income attributable to noncontrolling interests — — — (1,743 ) (1,743 ) Net income (loss) attributable to Holly Energy Partners 30,401 37,883 (117 ) (37,766 ) 30,401 Other comprehensive income (loss) 222 222 — (222 ) 222 Comprehensive income (loss) $ 30,623 $ 38,105 $ (117 ) $ (37,988 ) $ 30,623 Condensed Consolidating Statement of Comprehensive Income Three Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 61,427 $ 3,359 $ (306 ) $ 64,480 Third parties — 8,533 1,985 — 10,518 — 69,960 5,344 (306 ) 74,998 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 22,179 2,694 (306 ) 24,567 Depreciation and amortization — 12,288 3,594 — 15,882 General and administrative 585 1,931 — — 2,516 585 36,398 6,288 (306 ) 42,965 Operating income (loss) (585 ) 33,562 (944 ) — 32,033 Equity in earnings (loss) of subsidiaries 28,631 (708 ) — (27,923 ) — Equity in earnings of SLC Pipeline — 748 — — 748 Interest expense (5,012 ) (3,317 ) — — (8,329 ) Other income — 26 — — 26 23,619 (3,251 ) — (27,923 ) (7,555 ) Income (loss) before income taxes 23,034 30,311 (944 ) (27,923 ) 24,478 State income tax expense — (28 ) — — (28 ) Net income (loss) 23,034 30,283 (944 ) (27,923 ) 24,450 Allocation of net income attributable to noncontrolling interests — — — (1,416 ) (1,416 ) Net income (loss) attributable to Holly Energy Partners 23,034 30,283 (944 ) (29,339 ) 23,034 Other comprehensive income (loss) (746 ) (746 ) — 746 (746 ) Comprehensive income (loss) $ 22,288 $ 29,537 $ (944 ) $ (28,593 ) $ 22,288 Condensed Consolidating Statement of Comprehensive Income Six Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 127,783 $ 12,769 $ — $ 140,552 Third parties — 23,282 9,401 — 32,683 — 151,065 22,170 — 173,235 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 47,642 5,613 — 53,255 Depreciation and amortization — 22,278 7,479 — 29,757 General and administrative 1,700 4,286 — — 5,986 1,700 74,206 13,092 — 88,998 Operating income (loss) (1,700 ) 76,859 9,078 — 84,237 Equity in earnings (loss) of subsidiaries 74,044 6,772 — (80,816 ) — Equity in earnings of SLC Pipeline — 1,365 — — 1,365 Interest expense (10,140 ) (7,684 ) — — (17,824 ) Interest income — 3 — — 3 Other income (expense) — 279 (49 ) — 230 63,904 735 (49 ) (80,816 ) (16,226 ) Income (loss) before income taxes 62,204 77,594 9,029 (80,816 ) 68,011 State income tax expense — (37 ) — — (37 ) Net income (loss) 62,204 77,557 9,029 (80,816 ) 67,974 Allocation of net income attributable to noncontrolling interests — — — (5,770 ) (5,770 ) Net income (loss) attributable to Holly Energy Partners 62,204 77,557 9,029 (86,586 ) 62,204 Other comprehensive income (loss) (527 ) (527 ) — 527 (527 ) Comprehensive income (loss) $ 61,677 $ 77,030 $ 9,029 $ (86,059 ) $ 61,677 Condensed Consolidating Statement of Comprehensive Income Six Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 123,042 $ 13,883 $ (613 ) $ 136,312 Third parties — 19,614 6,076 — 25,690 — 142,656 19,959 (613 ) 162,002 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 42,330 5,662 (613 ) 47,379 Depreciation and amortization — 24,281 7,189 — 31,470 General and administrative 1,643 4,024 — — 5,667 1,643 70,635 12,851 (613 ) 84,516 Operating income (loss) (1,643 ) 72,021 7,108 — 77,486 Equity in earnings (loss) of subsidiaries 69,195 5,331 — (74,526 ) — Equity in earnings of SLC Pipeline — 1,270 — — 1,270 Interest expense (12,698 ) (6,085 ) — — (18,783 ) Interest income — 3 — — 3 Loss on early extinguishment of debt (7,677 ) — — — (7,677 ) Other income — 34 — — 34 48,820 553 — (74,526 ) (25,153 ) Income (loss) before income taxes 47,177 72,574 7,108 (74,526 ) 52,333 State income tax expense — (103 ) — — (103 ) Net income (loss) 47,177 72,471 7,108 (74,526 ) 52,230 Allocation of net income attributable to noncontrolling interests — — — (5,053 ) (5,053 ) Net income (loss) attributable to Holly Energy Partners 47,177 72,471 7,108 (79,579 ) 47,177 Other comprehensive income (loss) (651 ) (651 ) — 651 (651 ) Comprehensive income (loss) $ 46,526 $ 71,820 $ 7,108 $ (78,928 ) $ 46,526
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2015 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (9,639 ) $ 111,517 $ 15,358 $ (6,772 ) $ 110,464 Cash flows from investing activities Additions to properties and equipment — (22,159 ) (784 ) — (22,943 ) Purchase of El Dorado crude tanks — (27,500 ) — — (27,500 ) Proceeds from sale of assets — 965 — — 965 Distributions from UNEV — 1,853 — (1,853 ) — Distributions in excess of equity in earnings in SLC Pipeline — 198 — — 198 — (46,643 ) (784 ) (1,853 ) (49,280 ) Cash flows from financing activities Net borrowings under credit agreement — 33,000 — — 33,000 Net intercompany financing activities 92,498 (92,498 ) — — — Distributions to HEP unitholders (82,614 ) — — — (82,614 ) Distributions to noncontrolling interests — — (11,500 ) 8,625 (2,875 ) Purchase of units for incentive grants (247 ) — — — (247 ) Other — (854 ) — — (854 ) 9,637 (60,352 ) (11,500 ) 8,625 (53,590 ) Cash and cash equivalents Increase (decrease) for the period (2 ) 4,522 3,074 — 7,594 Beginning of period 2 2,828 — — 2,830 End of period $ — $ 7,350 $ 3,074 $ — $ 10,424 Condensed Consolidating Statement of Cash Flows Six Months Ended June 30, 2014 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (15,764 ) $ 96,308 $ 11,819 $ — $ 92,363 Cash flows from investing activities Additions to properties and equipment — (33,831 ) (4,743 ) — (38,574 ) Distributions from noncontrolling interest — 6,000 — (6,000 ) — Distributions in excess of equity in earnings of SLC Pipeline — 105 — — 105 — (27,726 ) (4,743 ) (6,000 ) (38,469 ) Cash flows from financing activities Net repayments under credit agreement — 180,000 — — 180,000 Net intercompany financing activities 247,935 (247,935 ) — — — Redemption of senior notes (156,188 ) — — — (156,188 ) Distributions to HEP unitholders (75,577 ) — — — (75,577 ) Distributions to noncontrolling interests — — (8,000 ) 6,000 (2,000 ) Purchase of units for incentive grants (406 ) — — — (406 ) Other — (9 ) — — (9 ) 15,764 (67,944 ) (8,000 ) 6,000 (54,180 ) Cash and cash equivalents Increase (decrease) for the period — 638 (924 ) — (286 ) Beginning of period 2 1,447 4,903 — 6,352 End of period $ 2 $ 2,085 $ 3,979 $ — $ 6,066

Description of Business and P29

Description of Business and Presentation of Financial Statements (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015USD ($)miin	Dec. 31, 2014USD ($)
Other Ownership Interests [Line Items]
Ownership percentage, controlling interest	39.00%
General partner interest	2.00%
Unamortized Debt Issuance Expense | $	$ 4.7	$ 4.4
SLC Pipeline [Member]
Other Ownership Interests [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
Crude Oil Pipeline, Length	95
UNEV Pipeline [Member]
Other Ownership Interests [Line Items]
Equity Method Investment, Ownership Percentage	75.00%
Crude Oil Pipeline, Length	427
Description Of Pipeline Acquired | in	12

Financial Instruments (Narrativ

Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 296,582	$ 292,065
Interest Rate Swap [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Assets, Fair Value Disclosure	134	1,019
Financial Liabilities Fair Value Disclosure	707	1,065
6.5% Senior Notes [Member] | Fair value inputs, Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	295,875	291,000
Carrying Amount [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	297,612	297,644
Carrying Amount [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Assets, Fair Value Disclosure	134	1,019
Financial Liabilities Fair Value Disclosure	707	1,065
Carrying Amount [Member] | 6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 296,905	$ 296,579

Properties and Equipment (Detai

Properties and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$ 1,325,242		$ 1,280,479
Less accumulated depreciation	324,434		300,000
Properties and equipment, net	1,000,808		980,479
Purchase of equipment	27,500	$ 0
Interest costs, capitalized during period	(612)	(863)
Depreciation	26,000	$ 27,800
Pipelines and terminals [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	1,180,313		1,137,157
Land and right of way [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	65,025		64,458
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	57,258		56,228
Other Fixed Assets [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$ 22,646		$ 22,636

Transportation Agreements (Deta

Transportation Agreements (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2015USD ($)yr	Dec. 31, 2014USD ($)
Finite-Lived Intangible Assets, Net [Abstract]
Transportation agreements, gross	$ 134,214	$ 134,164
Less accumulated amortization	56,935	53,461
Transportation agreements, net	$ 77,279	80,703
Alon transportation agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life (years)	30 years
Finite-Lived Intangible Assets, Useful Life, Initial Term (years) | yr	15
Finite-Lived Intangible Assets, Useful Life, Extension Period (years) | yr	15
Finite-Lived Intangible Assets, Net [Abstract]
Transportation agreements, gross	$ 59,933	59,933
HFC transportation agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life (years)	15 years
Finite-Lived Intangible Assets, Net [Abstract]
Transportation agreements, gross	$ 74,231	74,231
El Dorado [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Transportation agreements, gross	$ 50	$ 0

Employees, Retirement and Inc33

Employees, Retirement and Incentive Plans Retirement and Benefit Plan Costs (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)Typesshares	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)TypesComponentsshares	Jun. 30, 2014USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee benefits and share-based compensation	$ 1.7	$ 1.9	$ 3.1	$ 3.6
Long-term incentive plan, components | Components			4
Equity-based compensation, types | Types	3		3
Compensation costs of incentive awards	$ 0.9	$ 0.8	$ 1.6
Deferred Bonus [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units authorized under equity-based compensation plans (new) | shares	2,500,000		2,500,000
Number of units available for grant | shares	1,537,167		1,537,167

Employees, Retirement and Inc34

Employees, Retirement and Incentive Plans Restricted Units (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 1.7	$ 1.7
Weighted average remaining contractual term (years)		1 year 2 months 13 days
Nonvested restricted units outstanding	123,228	123,228	126,077
Weighted average grant date fair value	$ 33.42	$ 33.42	$ 33.43
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures		(2,849)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		$ 33.57

Employees, Retirement and Inc35

Employees, Retirement and Incentive Plans Performance Units (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total	Total
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 2.2	$ 2.2
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated Share Payouts, Outstanding Nonvested Performance Unit Awards Minimum	100.00%	100.00%
Estimated Share Payouts, Outstanding Nonvested Performance Unit Awards Maximum	140.00%	140.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at January 1, 2015 (nonvested)		71,245
Vesting and transfer of full ownership to recipients		(11,436)
Outstanding at June 30, 2105 (nonvested)	59,809	59,809
Fair value of vested units transferred to recipients		$ 0.3
Total unrecognized compensation related to nonvested units	$ 0.8	$ 0.8
Weighted average remaining contractual term (years)		1 year 2 months 13 days
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Long-term Incentive Plan [Member] | Executive Officer [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated Share Payouts, Outstanding Nonvested Performance Unit Awards Maximum	150.00%	150.00%
Range of performance units earned, based on performance units granted, minimum (percent)		50.00%
Maximum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years

Debt Credit Agreement (Details)

Debt Credit Agreement (Details) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity	$ 850	$ 650
Credit Agreement [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity	$ 50

Debt Senior Notes (Details)

Debt Senior Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 0	$ 0	$ 0	$ (7,677)
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal	$ 300,000		$ 300,000		$ 300,000
Stated interest rate, senior notes	6.50%		6.50%
Debt Instrument, Unamortized Discount	$ 3,095		$ 3,095		$ 3,421
6.5% Interest Rate [Member]
Debt Instrument [Line Items]
Principal	$ 300,000		$ 300,000
Stated interest rate, senior notes	6.50%	6.50%	6.50%	6.50%
Eight Point Two Five Percentage Senior Notes Due Two Thousand Eighteen Member
Debt Instrument [Line Items]
Principal		$ 150,000		$ 150,000
Stated interest rate, senior notes		8.25%		8.25%
Extinguishment of Debt, Amount				$ 156,200
Loss on early extinguishment of debt				7,700
Redemption Premium				6,200
Amortization of Financing Costs and Discounts				$ 1,500

Debt Long-Term Debt (Details)

Debt Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Credit Agreement	$ 604,000	$ 571,000
Total long-term debt	900,905	867,579
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal	300,000	300,000
Unamortized discount	(3,095)	(3,421)
Senior Notes	$ 296,905	$ 296,579

Debt Interest Rate Risk Managem

Debt Interest Rate Risk Management (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 604,000	$ 604,000	$ 571,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(573)	(573)	(46)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		600
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	305,000	305,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	600	600
Interest Rate Swap [Member] | Cash Flow Hedge $155 million [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 155,000	$ 155,000
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%
Interest Rate Swap [Member] | Cash Flow Hedge $150 million [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 150,000	$ 150,000
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%
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative liabilities, fair value	$ 707	$ 707	1,065
Derivative Instruments and Hedges, Liabilities	573	573	46
Other Assets [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative Asset	(134)	(134)	(1,019)
Accumulated Other Comprehensive Income (Loss) [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Derivative Instruments and Hedges, Assets	(573)	(573)
Derivative liabilities, fair value	(707)	(707)	(1,065)
Derivative Asset	$ 134	$ 134	1,019
Derivative Instruments and Hedges, Liabilities			$ (46)

Debt Interest Expense and Other

Debt Interest Expense and Other Debt Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Interest expense, debt			$ 18,436	$ 19,646
Less capitalized interest			(612)	(863)
Interest expense	$ 9,056	$ 8,329	17,824	18,783
Cash paid for interest			17,280	22,249
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense, debt			7,488	6,165
Senior Notes [Member] | 6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt			9,757	9,696
Senior Notes [Member] | 8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt			0	2,544
Amortization discount and deferred debt issuance costs [Member]
Debt Instrument [Line Items]
Interest expense, debt			930	948
Loan Lending Commitment Arrangement Fees [Member]
Debt Instrument [Line Items]
Interest expense, debt			$ 261	$ 293

Significant Customers (Details)

Significant Customers (Details) - Customers	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
HFC [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	82.00%	86.00%	81.00%	84.00%
Alon [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	7.00%	10.00%	9.00%
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage			92.10%
Concentration risk, number of significant customers			2

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2015
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	$ 600			$ 1,200		$ 2,400
Expenses resulting from agreement with related party	7,500		$ 9,600	16,200	$ 18,800
Revenue from related parties	68,297		64,480	140,552	136,312
Reimbursements paid to related parties	4,400		3,900	7,000	8,400
Distributions to HEP unitholders				(82,614)	(75,577)
Due from Affiliate, Current	28,800	$ 33,400		28,800
Due to Affiliate, Current	7,811	5,239		7,811
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	236,600			236,600
Distributions to HEP unitholders	(22,300)		(19,800)	(43,900)	$ (39,000)
Shortfall Payments [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 6,000		$ 7,600
Deferred revenue, related parties		$ 7,300		$ 5,400

Partners' Equity, Issuances (De

Partners' Equity, Issuances (Details) - Jun. 30, 2015 - shares	Total
Partners' Capital [Abstract]
Partners' capital account, units held by controlling interest	22,380,030
General partner ownership interest	2.00%
Ownership percentage, controlling interest	39.00%

Partners' Equity, Allocations o

Partners' Equity, Allocations of Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Partners' Capital [Abstract]
General Partner Interest in Net Income	$ 412	$ 299	$ 861	$ 628
General partner incentive distribution	9,784	8,094	19,145	15,766
General partner interest in net income attributable to HEP	$ 10,196	$ 8,393	$ 20,006	$ 16,394

Partners' Equity, Cash Distribu

Partners' Equity, Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allocations of Quarterly Cash Distributions to General and Limited Partners
Partners' Capital, Distribution Amount Per Share	$ 0.5450		$ 0.5450
Partner Distributions
General partner interest	$ 877	$ 807	$ 1,738	$ 1,597
Incentive Distribution, Distribution	9,784	8,094	19,145	15,766
Total general partner distribution	10,661	8,901	20,883	17,363
Limited partner distribution	31,968	30,209	63,496	59,977
Total regular quarterly cash distribution	$ 42,629	$ 39,110	$ 84,379	$ 77,340
Cash distribution per unit applicable to limited partners	$ 0.5450	$ 0.5150	$ 1.0825	$ 1.0225

Environmental Loss Contingenc46

Environmental Loss Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Loss Contingencies [Line Items]
Environmental Remediation Expense	$ 0.9	$ 4.2	$ 0.7
Accrued Environmental Expense		15.3		$ 12
Accrued Environmental Expense, Noncurrent		12.3		8.7
Affiliated Entity [Member]
Loss Contingencies [Line Items]
Accrued Environmental Expense		6.6		6.8
Environmental Recovery Receivable		$ 6.6		$ 6.8

Supplemental Guarantor _ Non-47

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,424	$ 2,830	$ 6,066	$ 6,352
Accounts receivable	40,044	40,129
Prepaid and other current assets	4,738	4,383
Total current assets	55,206	47,342
Properties and equipment, net	1,000,808	980,479
Investments in subsidiaries	0	0
Transportation agreements, net	77,279	80,703
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,280	24,478
Other assets	11,172	12,055
Total assets	1,425,243	1,401,555
Current liabilities:
Accounts payable	16,128	17,881
Accrued interest	6,783	6,615
Deferred revenue	9,940	12,432
Accrued property taxes	4,335	2,703
Other current liabilities	4,826	4,571
Total current liabilities	42,012	44,202
Long-term debt	900,905	867,579
Other long-term liabilities	21,132	18,145
Deferred revenue	35,484	29,392
Class B unit	30,305	26,793
Partners' Capital	300,940	320,362
Equity - noncontrolling interest	94,465	95,082
Total liabilities and equity	1,425,243	1,401,555
Parent Company [Member]
Current assets:
Cash and cash equivalents	0	2	2	2
Accounts receivable	2	0
Prepaid and other current assets	82	212
Total current assets	84	214
Properties and equipment, net	0	0
Investments in subsidiaries	603,118	622,100
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	1,344	1,319
Total assets	604,546	623,633
Current liabilities:
Accounts payable	0	0
Accrued interest	6,500	6,500
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	24	45
Total current liabilities	6,524	6,545
Long-term debt	296,905	296,579
Other long-term liabilities	177	147
Deferred revenue	0	0
Class B unit	0	0
Partners' Capital	300,940	320,362
Equity - noncontrolling interest	0	0
Total liabilities and equity	604,546	623,633
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	7,350	2,828	2,085	1,447
Accounts receivable	35,771	34,274
Prepaid and other current assets	3,395	2,856
Total current assets	46,516	39,958
Properties and equipment, net	624,509	596,988
Investments in subsidiaries	283,393	285,247
Transportation agreements, net	77,279	80,703
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,280	24,478
Other assets	9,828	10,736
Total assets	1,322,303	1,294,608
Current liabilities:
Accounts payable	15,343	15,495
Accrued interest	283	115
Deferred revenue	6,440	5,672
Accrued property taxes	1,739	1,902
Other current liabilities	4,801	4,408
Total current liabilities	28,606	27,592
Long-term debt	604,000	571,000
Other long-term liabilities	20,790	17,731
Deferred revenue	35,484	29,392
Class B unit	30,305	26,793
Partners' Capital	603,118	622,100
Equity - noncontrolling interest	0	0
Total liabilities and equity	1,322,303	1,294,608
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	3,074	0	3,979	4,903
Accounts receivable	4,442	6,044
Prepaid and other current assets	1,261	1,315
Total current assets	8,777	7,359
Properties and equipment, net	376,299	383,491
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	385,076	390,850
Current liabilities:
Accounts payable	956	2,575
Accrued interest	0	0
Deferred revenue	3,500	6,760
Accrued property taxes	2,596	801
Other current liabilities	1	118
Total current liabilities	7,053	10,254
Long-term debt	0	0
Other long-term liabilities	165	267
Deferred revenue	0	0
Class B unit	0	0
Partners' Capital	377,858	380,329
Equity - noncontrolling interest	0	0
Total liabilities and equity	385,076	390,850
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable	(171)	(189)
Prepaid and other current assets	0	0
Total current assets	(171)	(189)
Properties and equipment, net	0	0
Investments in subsidiaries	(886,511)	(907,347)
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	0	0
Total assets	(886,682)	(907,536)
Current liabilities:
Accounts payable	(171)	(189)
Accrued interest	0	0
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	0	0
Total current liabilities	(171)	(189)
Long-term debt	0	0
Other long-term liabilities	0	0
Deferred revenue	0	0
Class B unit	0	0
Partners' Capital	(980,976)	(1,002,429)
Equity - noncontrolling interest	94,465	95,082
Total liabilities and equity	$ (886,682)	$ (907,536)

Supplemental Guarantor _ Non-48

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues [Abstract]
Affiliates	$ 68,297	$ 64,480	$ 140,552	$ 136,312
Third parties	15,182	10,518	32,683	25,690
Total revenues	83,479	74,998	173,235	162,002
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	25,289	24,567	53,255	47,379
Depreciation and amortization	15,063	15,882	29,757	31,470
General and administrative	2,696	2,516	5,986	5,667
Total operating costs and expenses	43,048	42,965	88,998	84,516
Operating income (loss)	40,431	32,033	84,237	77,486
Equity in Earnings of Subsidiaries	0	0	0	0
Income (Loss) from Equity Method Investments	631	748	1,365	1,270
Interest expense	(9,056)	(8,329)	(17,824)	(18,783)
Loss on early extinguishment of debt	0	0	0	(7,677)
Interest income	3	0	3	3
Other income	71	26	230	34
Total other income (expense)	(8,351)	(7,555)	(16,226)	(25,153)
Income before income taxes	32,080	24,478	68,011	52,333
State income tax benefit (expense)	64	(28)	(37)	(103)
Net income	32,144	24,450	67,974	52,230
Allocation of Net Income Attributable to Noncontrolling Interest	(1,743)	(1,416)	(5,770)	(5,053)
Net income attributable to Holly Energy Partners	30,401	23,034	62,204	47,177
Other comprehensive income (loss)	222	(746)	(527)	(651)
Comprehensive income	30,623	22,288	61,677	46,526
SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments	631	748	1,365	1,270
Parent Company [Member]
Revenues [Abstract]
Affiliates	0	0	0	0
Third parties	0	0	0	0
Total revenues	0	0	0	0
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	$ 0	0	0	0
Depreciation and amortization		0	0	0
General and administrative	$ 637	585	1,700	1,643
Total operating costs and expenses	637	585	1,700	1,643
Operating income (loss)	(637)	(585)	(1,700)	(1,643)
Equity in Earnings of Subsidiaries	36,111	28,631	74,044	69,195
Interest expense	(5,073)	(5,012)	(10,140)	(12,698)
Loss on early extinguishment of debt				(7,677)
Interest income	0		0	0
Other income	0	0	0	0
Total other income (expense)	31,038	23,619	63,904	48,820
Income before income taxes	30,401	23,034	62,204	47,177
State income tax benefit (expense)	0	0	0	0
Net income	30,401	23,034	62,204	47,177
Allocation of Net Income Attributable to Noncontrolling Interest	0	0	0	0
Net income attributable to Holly Energy Partners	30,401	23,034	62,204	47,177
Other comprehensive income (loss)	222	(746)	(527)	(651)
Comprehensive income	30,623	22,288	61,677	46,526
Parent Company [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments	0	0	0	0
Guarantor Subsidiaries [Member]
Revenues [Abstract]
Affiliates	64,727	61,427	127,783	123,042
Third parties	11,895	8,533	23,282	19,614
Total revenues	76,622	69,960	151,065	142,656
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	22,111	22,179	47,642	42,330
Depreciation and amortization	11,316	12,288	22,278	24,281
General and administrative	2,059	1,931	4,286	4,024
Total operating costs and expenses	35,486	36,398	74,206	70,635
Operating income (loss)	41,136	33,562	76,859	72,021
Equity in Earnings of Subsidiaries	(88)	(708)	6,772	5,331
Interest expense	(3,983)	(3,317)	(7,684)	(6,085)
Loss on early extinguishment of debt				0
Interest income	3		3	3
Other income	120	26	279	34
Total other income (expense)	(3,317)	(3,251)	735	553
Income before income taxes	37,819	30,311	77,594	72,574
State income tax benefit (expense)	64	(28)	(37)	(103)
Net income	37,883	30,283	77,557	72,471
Allocation of Net Income Attributable to Noncontrolling Interest	0	0	0	0
Net income attributable to Holly Energy Partners	37,883	30,283	77,557	72,471
Other comprehensive income (loss)	222	(746)	(527)	(651)
Comprehensive income	38,105	29,537	77,030	71,820
Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments	631	748	1,365	1,270
Non-Guarantor Subsidiaries [Member]
Revenues [Abstract]
Affiliates	3,545	3,359	12,769	13,883
Third parties	3,287	1,985	9,401	6,076
Total revenues	6,832	5,344	22,170	19,959
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	3,153	2,694	5,613	5,662
Depreciation and amortization	3,747	3,594	7,479	7,189
General and administrative	0	0	0	0
Total operating costs and expenses	6,900	6,288	13,092	12,851
Operating income (loss)	(68)	(944)	9,078	7,108
Equity in Earnings of Subsidiaries	0	0	0	0
Interest expense	0	0	0	0
Loss on early extinguishment of debt				0
Interest income	0		0	0
Other income	(49)	0	(49)	0
Total other income (expense)	(49)	0	(49)	0
Income before income taxes	(117)	(944)	9,029	7,108
State income tax benefit (expense)	0	0	0	0
Net income	(117)	(944)	9,029	7,108
Allocation of Net Income Attributable to Noncontrolling Interest	0	0	0	0
Net income attributable to Holly Energy Partners	(117)	(944)	9,029	7,108
Other comprehensive income (loss)	0	0	0	0
Comprehensive income	(117)	(944)	9,029	7,108
Non-Guarantor Subsidiaries [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments	0	0	0	0
Eliminations [Member]
Revenues [Abstract]
Affiliates	25	(306)	0	(613)
Third parties	0	0	0	0
Total revenues	25	(306)	0	(613)
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	25	(306)	0	(613)
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Total operating costs and expenses	25	(306)	0	(613)
Operating income (loss)	0	0	0	0
Equity in Earnings of Subsidiaries	(36,023)	(27,923)	(80,816)	(74,526)
Interest expense	0	0	0	0
Loss on early extinguishment of debt				0
Interest income	0		0	0
Other income	0	0	0	0
Total other income (expense)	(36,023)	(27,923)	(80,816)	(74,526)
Income before income taxes	(36,023)	(27,923)	(80,816)	(74,526)
State income tax benefit (expense)	0	0	0	0
Net income	(36,023)	(27,923)	(80,816)	(74,526)
Allocation of Net Income Attributable to Noncontrolling Interest	(1,743)	(1,416)	(5,770)	(5,053)
Net income attributable to Holly Energy Partners	(37,766)	(29,339)	(86,586)	(79,579)
Other comprehensive income (loss)	(222)	746	527	651
Comprehensive income	(37,988)	(28,593)	(86,059)	(78,928)
Eliminations [Member] | SLC Pipeline [Member]
Operating costs and expenses [Abstract]
Income (Loss) from Equity Method Investments	$ 0	$ 0	$ 0	$ 0

Supplemental Guarantor _ Non-49

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 110,464	$ 92,363
Cash flows from investing activities
Additions to properties and equipment	(22,943)	(38,574)
Purchase of equipment	27,500	0
Proceeds from sale of assets	965	0
Proceeds from Noncontrolling Interests	0	0
Distributions in excess of equity in earnings of SLC Pipeline	198	105
Net Cash Provided by (Used in) Investing Activities	(49,280)	(38,469)
Proceeds from (Repayments of) Lines of Credit	33,000	180,000
Cash flows from financing activities
Net Intercompany Financing Activities	0	0
Proceeds from issuance of common units		(156,188)
Redemption of senior notes	0	(156,188)
Distributions to HEP unitholders	(82,614)	(75,577)
Distributions to noncontrolling interests	(2,875)	(2,000)
Purchase of units for incentive grants	(247)	(406)
Other	(854)	(9)
Net cash used for financing activities	(53,590)	(54,180)
Increase (decrease) for the period	7,594	(286)
Beginning of period	2,830	6,352
End of period	10,424	6,066
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(9,639)	(15,764)
Cash flows from investing activities
Additions to properties and equipment	0	0
Purchase of equipment	0
Proceeds from sale of assets	0
Proceeds from Noncontrolling Interests	0	0
Distributions in excess of equity in earnings of SLC Pipeline	0	0
Net Cash Provided by (Used in) Investing Activities	0	0
Proceeds from (Repayments of) Lines of Credit	0	0
Cash flows from financing activities
Net Intercompany Financing Activities	92,498	247,935
Proceeds from issuance of common units		(156,188)
Distributions to HEP unitholders	(82,614)	(75,577)
Distributions to noncontrolling interests	0	0
Purchase of units for incentive grants	(247)	(406)
Other	0	0
Net cash used for financing activities	9,637	15,764
Increase (decrease) for the period	(2)	0
Beginning of period	2	2
End of period	0	2
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	111,517	96,308
Cash flows from investing activities
Additions to properties and equipment	(22,159)	(33,831)
Purchase of equipment	27,500
Proceeds from sale of assets	965
Proceeds from Noncontrolling Interests	1,853	6,000
Distributions in excess of equity in earnings of SLC Pipeline	198	105
Net Cash Provided by (Used in) Investing Activities	(46,643)	(27,726)
Proceeds from (Repayments of) Lines of Credit	33,000	180,000
Cash flows from financing activities
Net Intercompany Financing Activities	(92,498)	(247,935)
Proceeds from issuance of common units		0
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	0	0
Purchase of units for incentive grants	0	0
Other	(854)	(9)
Net cash used for financing activities	(60,352)	(67,944)
Increase (decrease) for the period	4,522	638
Beginning of period	2,828	1,447
End of period	7,350	2,085
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	15,358	11,819
Cash flows from investing activities
Additions to properties and equipment	(784)	(4,743)
Purchase of equipment	0
Proceeds from sale of assets	0
Proceeds from Noncontrolling Interests	0	0
Distributions in excess of equity in earnings of SLC Pipeline	0	0
Net Cash Provided by (Used in) Investing Activities	(784)	(4,743)
Proceeds from (Repayments of) Lines of Credit	0	0
Cash flows from financing activities
Net Intercompany Financing Activities	0	0
Proceeds from issuance of common units		0
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	(11,500)	8,000
Purchase of units for incentive grants	0	0
Other	0	0
Net cash used for financing activities	(11,500)	(8,000)
Increase (decrease) for the period	3,074	(924)
Beginning of period	0	4,903
End of period	3,074	3,979
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(6,772)	0
Cash flows from investing activities
Additions to properties and equipment	0	0
Purchase of equipment	0
Proceeds from sale of assets	0
Proceeds from Noncontrolling Interests	(1,853)	(6,000)
Distributions in excess of equity in earnings of SLC Pipeline	0	0
Net Cash Provided by (Used in) Investing Activities	(1,853)	(6,000)
Proceeds from (Repayments of) Lines of Credit	0	0
Cash flows from financing activities
Net Intercompany Financing Activities	0	0
Proceeds from issuance of common units		0
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	(8,625)	(6,000)
Purchase of units for incentive grants	0	0
Other	0	0
Net cash used for financing activities	8,625	6,000
Increase (decrease) for the period	0	0
Beginning of period	0	0
End of period	$ 0	$ 0