Holly Energy Partners (HEP) 10-Q31 Oct 182018 Q3 Quarterly reportFinancial data

Company Profile

Document Entity Information

Document Entity Information - USD ($)	9 Months Ended
Document Entity Information - USD ($)	Sep. 30, 2018	Oct. 26, 2018	Sep. 30, 2017
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	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		105,440,201
Entity Public Float			$ 1,200,000,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 6,375	$ 7,776
Accounts receivable:
Trade	10,301	12,803
Affiliates	47,109	51,501
Total accounts receivable	57,410	64,304
Prepaid and other current assets	2,713	2,311
Total current assets	66,498	74,391
Properties and equipment, net	1,540,713	1,569,471
Intangible assets, net	118,831	129,463
Goodwill	270,336	266,716
Equity method investments	83,911	85,279
Other assets	26,753	28,794
Total assets	2,107,042	2,154,114
Accounts payable:
Trade	9,988	14,547
Affiliates	6,414	7,725
Total accounts payable	16,402	22,272
Accrued interest	5,730	13,256
Deferred revenue	12,360	9,598
Accrued property taxes	7,398	4,652
Other current liabilities	3,694	5,707
Total current liabilities	45,584	55,485
Long-term debt	1,416,748	1,507,308
Other long-term liabilities	15,255	15,843
Deferred revenue	48,408	47,272
Class B unit	45,380	43,141
Partners’ equity:
Common unitholders (105,440,201 and 101,568,955 units issued and outstanding at September 30, 2018 and December 31, 2017, respectively)	446,946	393,959
Noncontrolling interest	88,721	91,106
Total Equity	535,667	485,065
Total liabilities and equity	$ 2,107,042	$ 2,154,114

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares	Sep. 30, 2018	Dec. 31, 2017
Partners' Equity:
Common units issued (in shares)	105,440,201	101,568,955
Common units outstanding (in shares)	105,440,201	101,568,955

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Affiliates	$ 100,188	$ 95,138	$ 295,629	$ 277,316
Revenues	25,596	15,226	77,799	47,826
Third parties	125,784	110,364	373,428	325,142
Operating costs and expenses:
Operations (exclusive of depreciation and amortization)	35,996	35,998	106,731	102,584
Depreciation and amortization	24,367	19,007	74,117	57,729
General and administrative	2,498	3,623	8,293	8,872
Total operating costs and expenses	62,861	58,628	189,141	169,185
Operating income	62,923	51,736	184,287	155,957
Other income (expense):
Equity in earnings of equity method investments	1,114	5,072	4,127	10,965
Interest expense	(18,042)	(14,072)	(53,249)	(41,359)
Interest income	540	101	1,581	306
Loss on early extinguishment of debt	0	0	0	(12,225)
Gain (loss) on sale of assets and other	38	155	71	317
Total other income (expense)	(16,350)	(8,744)	(47,470)	(41,996)
Income before income taxes	46,573	42,992	136,817	113,961
State income tax benefit (expense)	(39)	69	(149)	(164)
Net Income	46,534	43,061	136,668	113,797
Allocation of net income attributable to noncontrolling interests	(1,531)	(990)	(5,354)	(4,827)
Net income attributable to the partners	45,003	42,071	131,314	108,970
General partner interest in net income attributable to the Partnership, including incentive distributions	0	419	0	(35,047)
Limited partners’ interest in net income	$ 45,003	$ 42,490	$ 131,314	$ 73,923
Limited partners’ per unit interest in earnings—basic and diluted (in dollars per share)	$ 0.43	$ 0.66	$ 1.25	$ 1.16
Weighted average limited partners’ units outstanding (in shares)	105,440	64,319	104,908	63,845

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 46,534	$ 43,061	$ 136,668	$ 113,797
Other comprehensive income:
Change in fair value of cash flow hedging instruments	0	1	0	88
Reclassification adjustment to net income on partial settlement of cash flow hedge	0	(64)	0	(179)
Other comprehensive income	0	(63)	0	(91)
Comprehensive income before noncontrolling interest	46,534	42,998	136,668	113,706
Allocation of net comprehensive income to noncontrolling interests	(1,531)	(990)	(5,354)	(4,827)
Comprehensive income attributable to the partners	$ 45,003	$ 42,008	$ 131,314	$ 108,879

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 136,668	$ 113,797
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74,117	57,729
(Gain) loss on sale of assets	(196)	(269)
Amortization of deferred charges	2,278	2,317
Equity-based compensation expense	2,259	1,908
Equity in earnings of equity method investments, net of distributions	0	513
Loss on early extinguishment of debt	0	12,225
(Increase) decrease in operating assets:
Accounts receivable – trade	2,502	516
Accounts receivable – affiliates	4,392	(191)
Prepaid and other current assets	(402)	593
Increase (decrease) in operating liabilities:
Accounts payable – trade	(1,209)	3,393
Accounts payable – affiliates	1,311	6,866
Accrued interest	(7,526)	(12,543)
Deferred revenue	5,218	3,096
Accrued property taxes	2,746	2,090
Other current liabilities	(1,955)	(99)
Other, net	(169)	(750)
Net cash provided by operating activities	217,412	177,459
Cash flows from investing activities
Additions to properties and equipment	(34,270)	(30,675)
Other Payments to Acquire Businesses	(6,841)	0
Proceeds from sale of assets	210	794
Distributions in excess of equity in earnings of equity investments	1,368	1,224
Net cash used for investing activities	(39,533)	(28,657)
Cash flows from financing activities
Borrowings under credit agreement	256,000	628,000
Repayments of credit agreement borrowings	(347,000)	(431,000)
Proceeds from issuance of Senior Notes	0	101,750
Redemption of 6.5% Senior Notes	0	(309,750)
Proceeds from Issuance of common units	114,887	52,285
Distributions to HEP unitholders	(197,300)	(171,560)
Distributions to noncontrolling interests	(5,500)	(5,000)
Distribution to HFC for El Dorado tanks	0	(103)
Contributions from general partner	614	1,072
Payments of Debt Issuance Costs	0	(9,453)
Units withheld for tax withholding obligations	(58)	(35)
Other	(923)	(1,189)
Net cash used by financing activities	(179,280)	(144,983)
Cash and cash equivalents
Increase (decrease) for the period	(1,401)	3,819
Beginning of period	7,776	3,657
End of period	$ 6,375	$ 7,476

Consolidated Statement of Equit

Consolidated Statement of Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Common Units	Noncontrolling Interest
Balance, Beginning of Period at Dec. 31, 2017	$ 485,065	$ 393,959	$ 91,106
Increase (Decrease) in Partners' Equity [Roll Forward]
Issuance of common units	114,839	114,839
Distributions to HEP unitholders	(197,300)	(197,300)
Distributions to noncontrolling interest	(5,500)		(5,500)
Amortization of restricted and performance units	2,259	2,259
Class B unit accretion	(2,239)	(2,239)
Cumulative transition adjustment for adoption of revenue recognition standard	1,320	1,320
Other	555	555
Net income	136,668	133,553	3,115
Balance, End of Period at Sep. 30, 2018	$ 535,667	$ 446,946	$ 88,721

Description of Business and Pre

Description of Business and Presentation of Financial Statements	9 Months Ended
	Sep. 30, 2018
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. As of September 30, 2018 , HollyFrontier Corporation (“HFC”) and its subsidiaries own a 57% limited partner interest and the non-economic general partner interest in HEP. 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. On October 31, 2017, we closed on an equity restructuring transaction with HEP Logistics Holdings, L.P. (“HEP Logistics”), a wholly-owned subsidiary of HFC and the general partner of HEP, pursuant to which the incentive distribution rights (“IDRs”) held by HEP Logistics were canceled, and HEP Logistics' 2% general partner interest in HEP was converted into a non-economic general partner interest in HEP. In consideration, we issued 37,250,000 of our common units to HEP Logistics. In addition, HEP Logistics agreed to waive $2.5 million of limited partner cash distributions for each of twelve consecutive quarters beginning with the first quarter the units issued as consideration were eligible to receive distributions. As a result of this transaction, no distributions were made on the general partner interest after October 31, 2017. On January 25, 2018, we entered into a common unit purchase agreement in which certain purchasers agreed to purchase in a private placement 3,700,000 common units representing limited partner interests, at a price of $29.73 per common unit. The private placement closed on February 6, 2018, and we received proceeds of approximately $110 million , which were used to repay indebtedness under our revolving credit facility. We own and operate petroleum product and crude oil pipelines, terminal, tankage and loading rack facilities and refinery processing units that support HFC’s refining and marketing operations in the Mid-Continent, Southwest and Northwest regions of the United States and Delek US Holdings, Inc.’s (“Delek”) refinery in Big Spring, Texas. Additionally, we own a 75% interest in UNEV Pipeline, LLC (“UNEV”), a 50% interest in the Osage Pipe Line Company, LLC (“Osage”) and a 50% interest in the Cheyenne Pipeline LLC. We operate in two reportable segments, a Pipelines and Terminals segment and a Refinery Processing Unit segment. Disclosures around these segments are discussed in Note 15. 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, providing other services at our storage tanks and terminals and by charging fees for processing hydrocarbon feedstocks through our refinery processing units. We do not take ownership of products that we transport, terminal, store or process, 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 Annual Report on Form 10-K for the year ended December 31, 2017 . 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, 2018 . Principles of Consolidation and Common Control Transactions The consolidated financial statements include our accounts and those of subsidiaries and joint ventures that we control. All significant intercompany transactions and balances have been eliminated. Most of our acquisitions from HFC occurred while we were a consolidated variable interest entity (“VIE”) of HFC. Therefore, as an entity under common control with HFC, we recorded these acquisitions on our balance sheets at HFC's historical basis instead of our purchase price or fair value. Accounting Pronouncements Adopted During the Periods Presented Share-Based Compensation In March 2016, an accounting standard update was issued which simplifies the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. We adopted this standard effective January 1, 2017, with no impact to our financial condition or results of operations. The new standard also requires that employee taxes paid when an employer withholds units for tax withholding purposes be reported as financing activities in the statement of cash flows on a retrospective basis. Previously, this activity was included in our operating activities. The impact of this change for the nine months ended September 30, 2017 was not material to our consolidated statement of cash flows. Finally, consistent with our existing policy, we have elected to account for forfeitures on an estimated basis. 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 had an effective date of January 1, 2018, and we accounted for the new guidance using the modified retrospective implementation method, whereby a cumulative effect adjustment was recorded to retained earnings as of the date of initial application. In preparing for adoption, we evaluated the terms, conditions and performance obligations under our existing contracts with customers. Furthermore, we implemented policies to comply with this new standard. See Note 3 for additional information on our revenue recognition policies. Business Combinations In December 2014, an accounting standard update was issued to provide new guidance on the definition of a business in relation to accounting for identifiable intangible assets in business combinations. This standard had an effective date of January 1, 2018, and had no effect on our financial condition, results of operations or cash flows. Financial Assets and Liabilities In January 2016, an accounting standard update was issued requiring changes in the accounting and disclosures for financial instruments. This standard was effective beginning with our 2018 reporting year and had no effect on our financial condition, results of operations or cash flows. Accounting Pronouncements Not Yet Adopted Leases In February 2016, an accounting standard update was issued requiring leases to be measured and recognized as a lease liability, with a corresponding right-of-use asset on the balance sheet. This standard has an effective date of January 1, 2019, and we plan to apply practical expedients provided in the standards update that allow us, among other things, not to reassess contracts that commenced prior to the adoption. While we continue to evaluate the provisions of the standard to determine how it will affect our financial statements, the primary effect of adopting the new standard will be to record assets and obligations for current operating leases. Adoption of the standard is not expected to have a material impact on our results of operations or cash flows. In preparing for adoption, we have identified, reviewed and evaluated contracts containing lease and embedded lease arrangements. Additionally, we have acquired and are finalizing the implementation of software and are implementing systems to facilitate lease capture and related accounting treatment.

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions SLC Pipeline and Frontier Aspen On October 31, 2017, we acquired the remaining 75% interest in SLC Pipeline LLC (“SLC Pipeline”) and the remaining 50% interest in Frontier Aspen LLC (“Frontier Aspen”) from subsidiaries of Plains All American Pipeline, L.P. (“Plains”), for cash consideration of $250 million . Prior to this acquisition, we held noncontrolling interests of 25% of SLC Pipeline and 50% of Frontier Aspen. As a result of the acquisitions, SLC Pipeline and Frontier Aspen are wholly-owned subsidiaries of HEP. These acquisitions were accounted for as a business combination achieved in stages. Our pre-existing equity method investments in SLC Pipeline and Frontier Aspen were remeasured at an acquisition date fair value of $112 million since we now have a controlling interest, and we recognized a gain on the remeasurement in the fourth quarter of 2017 of $36.3 million . The fair value of our pre-existing equity method investments in SLC Pipeline and Frontier Aspen was estimated using Level 3 Inputs under the income method for these entities, adjusted for lack of control and marketability. The total consideration of $363.8 million , consisting of initial cash consideration of $250 million , working capital adjustments of $1.8 million and the fair value of our preexisting equity method investments in SLC Pipeline and Frontier Aspen of $112 million , was allocated to the acquisition date fair value of assets and liabilities acquired as of the October 31, 2017 acquisition date, with the excess purchase price recorded as goodwill. The following summarizes the value of assets and liabilities acquired: (in thousands) Cash and cash equivalents $ 4,609 Accounts receivable 5,164 Prepaid and other current assets 8 Properties and equipment 275,061 Intangible assets 70,182 Goodwill 13,845 Accounts payable (3,598 ) Accrued property taxes (1,438 ) Net assets acquired $ 363,833 SLC Pipeline is the owner of a 95-mile crude pipeline that transports crude oil into the Salt Lake City area from the Utah terminal of the Frontier Pipeline (defined below) and from Wahsatch Station. Frontier Aspen is the owner of a 289-mile crude pipeline from Casper, Wyoming to Frontier Station, Utah (the “Frontier Pipeline”) that supplies Canadian and Rocky Mountain crudes to Salt Lake City area refiners through a connection to the SLC Pipeline.

Revenues

Revenues	9 Months Ended
Revenues	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Revenues are generally recognized as products are shipped through our pipelines and terminals, feedstocks are processed through our refinery processing units or other services are rendered. The majority of our contracts with customers meet the definition of a lease since (1) performance of the contracts is dependent on specified property, plant, or equipment and (2) it is remote that one or more parties other than the customer will take more than a minor amount of the output associated with the specified property, plant, or equipment. Therefore, we bifurcate the consideration received between lease and service revenue. The service component is within the scope of Accounting Standards Codification (“ASC”) 606, which largely codified ASU 2014-09. Several of our contracts include incentive or reduced tariffs once a certain quarterly volume is met. Revenue from the variable element of these transactions is recognized based on the actual volumes shipped as it relates specifically to rendering the services during the applicable quarter. We adopted the new revenue recognition standard (see Note 1) using the modified retrospective method, whereby the cumulative effect of applying the new standard was recorded as an adjustment to the opening balance of retained earnings as well as the carrying amounts of assets and liabilities as of January 1, 2018, which had no impact on our cash flows. The following table reflects the cumulative effect of adoption as of January 1, 2018: Prior to Adoption Increase (Decrease) As Adjusted (In thousands) Deferred revenue $ 9,598 $ (1,320 ) $ 8,278 Partners’ equity: Common unitholders $ 393,959 $ 1,320 $ 395,279 The majority of our long-term transportation contracts specify minimum volume requirements, whereby, we bill a customer for a minimum level of shipments in the event a customer ships below their contractual requirements. If there are no future performance obligations, we will recognize these deficiency payments in revenue. In certain of these throughput agreements, a customer may later utilize such shortfall billings as credit towards future volume shipments in excess of its minimum levels within its respective contractual shortfall make-up period. Such amounts represent an obligation to perform future services, which may be initially deferred and later recognized as revenue based on estimated future shipping levels, including the likelihood of a customer’s ability to utilize such amounts prior to the end of the contractual shortfall make-up period. We recognize the service portion of these deficiency payments in revenue when we do not expect we will be required to satisfy these performance obligations in the future based on the pattern of rights exercised by the customer. During the three and nine months ended September 30, 2018 , we recognized $3.6 million and $10.6 million , respectively, of these deficiency payments in revenue, of which $0.1 million and $2.6 million , respectively, related to deficiency payments billed in prior periods. As of September 30, 2018 , deferred revenue reflected in our consolidated balance sheet related to shortfalls billed was $5.7 million . September 30, January 1, (In thousands) Contract asset $ 1,673 $ — Contract liability $ (5,726 ) $ (2,713 ) The contract assets and liabilities include both lease and service components. We recognized an immaterial amount of revenue, that was previously included in contract liability as of January 1, 2018, during the three months ended September 30, 2018 and $2.6 million during the nine months ended September 30, 2018 . As of September 30, 2018 , we expect to recognize $2.4 billion in revenue related to our unfulfilled performance obligations under the terms of our long-term throughput agreements and operating leases expiring in 2019 through 2036 . These agreements provide for changes in the minimum revenue guarantees annually for increases or decreases in the Producer Price Index (“PPI”) or Federal Energy Regulatory Commission (“FERC”) index, with certain contracts having provisions that limit the level of the rate increases or decreases. We expect to recognize revenue for these unfulfilled performance obligations as shown in the table below (amounts shown in table include both service and lease revenues): Years Ending December 31, (In millions) Remainder of 2018 $ 94 2019 352 2020 305 2021 294 2022 267 Thereafter 1,041 Total $ 2,353 Payment terms under our contracts with customers are consistent with industry norms and are typically payable within 10 to 30 days of the date of invoice. Disaggregated revenues are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Pipelines $ 69,735 $ 54,072 $ 207,443 $ 161,768 Terminals, tanks and loading racks 36,469 35,701 109,036 105,864 Refinery processing units 19,580 20,591 56,949 57,510 $ 125,784 $ 110,364 $ 373,428 $ 325,142 During the three and nine months ended September 30, 2018 , lease revenues amounted to $71.3 million and $209.8 million , respectively, and service revenues amounted to $54.5 million and $163.6 million , respectively. Both of these revenues were recorded within affiliates and third parties revenues on our consolidated statement of income.
Revenue from Contract with Customer [Policy Text Block]	Revenues are generally recognized as products are shipped through our pipelines and terminals, feedstocks are processed through our refinery processing units or other services are rendered. The majority of our contracts with customers meet the definition of a lease since (1) performance of the contracts is dependent on specified property, plant, or equipment and (2) it is remote that one or more parties other than the customer will take more than a minor amount of the output associated with the specified property, plant, or equipment. Therefore, we bifurcate the consideration received between lease and service revenue. The service component is within the scope of Accounting Standards Codification (“ASC”) 606, which largely codified ASU 2014-09. Several of our contracts include incentive or reduced tariffs once a certain quarterly volume is met. Revenue from the variable element of these transactions is recognized based on the actual volumes shipped as it relates specifically to rendering the services during the applicable quarter.

Financial Instruments

Financial Instruments	9 Months Ended
Financial Instruments	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Financial Instruments	Financial Instruments Our financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, and debt. The carrying amounts of 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 were as follows: September 30, 2018 December 31, 2017 Financial Instrument Fair Value Input Level Carrying Value Fair Value Carrying Value Fair Value (In thousands) Liabilities: 6% Senior Notes Level 2 495,748 512,840 495,308 525,120 $ 495,748 $ 512,840 $ 495,308 $ 525,120 Level 2 Financial Instruments Our senior notes 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. See Note 8 for additional information.

Properties and Equipment

Properties and Equipment	9 Months Ended
Properties and Equipment	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Properties and Equipment	Properties and Equipment The carrying amounts of our properties and equipment are as follows: September 30, December 31, (In thousands) Pipelines, terminals and tankage $ 1,529,683 $ 1,541,722 Refinery assets 347,338 347,338 Land and right of way 85,961 86,484 Construction in progress 52,882 12,029 Other 35,376 35,659 2,051,240 2,023,232 Less accumulated depreciation 510,527 453,761 $ 1,540,713 $ 1,569,471 We capitalized $0.2 million and $0.7 million during the nine months ended September 30, 2018 and 2017 , respectively, in interest attributable to construction projects. Depreciation expense was $62.6 million and $52.1 million for the nine months ended September 30, 2018 and 2017 , respectively, and includes depreciation of assets acquired under capital leases.

Intangible Assets

Intangible Assets	9 Months Ended
Intangible Assets	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets Intangible assets include transportation agreements and customer relationships that represent a portion of the total purchase price of certain assets acquired from Delek in 2005, from HFC in 2008 prior to HEP becoming a consolidated VIE of HFC, from Plains in 2017, and from other minor acquisitions in 2018. The carrying amounts of our intangible assets are as follows: Useful Life September 30, December 31, (In thousands) Delek transportation agreement 30 years $ 59,933 $ 59,933 HFC transportation agreement 10-15 years 75,131 75,131 Customer relationships 10 years 69,683 69,282 Other 50 50 204,797 204,396 Less accumulated amortization 85,966 74,933 $ 118,831 $ 129,463 Amortization expense was $11.0 million and $5.2 million for the nine months ended September 30, 2018 and 2017 , respectively. We estimate amortization expense to be $14.0 million for each of the next four years and $9.8 million in 2023. 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 VIE 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	9 Months Ended
Employees, Retirement and Incentive Plans	Sep. 30, 2018
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. (“HLS”), 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 $1.9 million and $1.5 million for the three months ended September 30, 2018 and 2017 , respectively, and $5.3 million and $4.5 million for the nine months ended September 30, 2018 and 2017 , respectively. Under HLS’s secondment agreement with HFC (the “Secondment Agreement”), certain employees of HFC are seconded to HLS to provide operational and maintenance services for certain of our processing, refining, pipeline and tankage assets, and HLS reimburses HFC for its prorated portion of the wages, benefits, and other costs related to these employees. We have a Long-Term Incentive Plan for employees and non-employee directors who perform services for us. The Long-Term Incentive Plan consists of four components: restricted or phantom units, performance units, unit options and unit appreciation rights. Our accounting policy for the recognition of compensation expense for awards with pro-rata vesting (a significant proportion of our awards) is to expense the costs ratably over the vesting periods. As of September 30, 2018 , we had two types of incentive-based awards outstanding, which are described below. The compensation cost charged against income was $0.7 million for both the three months ended September 30, 2018 and 2017 , and $2.1 million and $1.6 million for the nine months ended September 30, 2018 and 2017 , respectively. We currently purchase units in the open market instead of issuing new units for settlement of all unit awards under our Long-Term Incentive Plan. As of September 30, 2018 , 2,500,000 units were authorized to be granted under our Long-Term Incentive Plan, of which 1,323,371 have not yet been granted, assuming no forfeitures of the unvested units and full achievement of goals for the unvested performance units. Restricted and Phantom Units Under our Long-Term Incentive Plan, we grant restricted units to non-employee directors and phantom units to selected employees who perform services for us, with most awards vesting over a period of one to three years. We previously granted restricted units to selected employees who perform services for us, which vest over a period of three years. Although full ownership of the units does not transfer to the recipients until the units vest, the recipients have distribution rights on these units from the date of grant, and the recipients of the restricted units have voting rights on the restricted units from the date of grant. The fair value of each restricted or phantom unit award is measured at the market price as of the date of grant and is amortized on a straight-line basis over the requisite service period for each separately vesting portion of the award. A summary of restricted and phantom unit activity and changes during the nine months ended September 30, 2018 , is presented below: Restricted and Phantom Units Units Weighted Average Grant-Date Fair Value Outstanding at January 1, 2018 (nonvested) 119,009 $ 34.77 Granted 12,890 30.23 Forfeited (1,664 ) 34.64 Outstanding at September 30, 2018 (nonvested) 130,235 $ 34.33 No restricted units were vested and transferred to recipients during the nine months ended September 30, 2018 . As of September 30, 2018 , there was $1.3 million of total unrecognized compensation expense related to unvested restricted and phantom unit grants, which is expected to be recognized over a weighted-average period of 1.0 years. Performance Units Under our Long-Term Incentive Plan, we grant performance units to selected officers who perform services for us. Performance units granted are payable in common units at the end of a three-year performance period based upon the growth in our distributable cash flow per common unit over the performance period. As of September 30, 2018 , estimated unit payouts for outstanding nonvested performance unit awards ranged between 100% and 150% of the target number of performance units granted. We granted 2,764 performance units during the nine months ended September 30, 2018 . Performance units granted in 2017 and 2018 vest over a three-year performance period ending December 31, 2020 and 2021, respectively, and 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 for the nine months ended September 30, 2018 , is presented below: Performance Units Units Outstanding at January 1, 2018 (nonvested) 36,911 Granted 2,764 Vesting and transfer of common units to recipients (4,283 ) Outstanding at September 30, 2018 (nonvested) 35,392 The grant date fair value of performance units vested and transferred to recipients during both the nine months ended September 30, 2018 and 2017 was $0.1 million . Based on the weighted-average fair value of performance units outstanding at September 30, 2018 , of $1.2 million , there was $0.5 million of total unrecognized compensation expense related to nonvested performance units, which is expected to be recognized over a weighted-average period of 1.1 years. During the nine months ended September 30, 2018 , we did not purchase any common units in the open market for the issuance and settlement of unit awards under our Long-Term Incentive Plan.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2018
Debt Instruments [Abstract]
Debt	Debt Credit Agreement We have a $1.4 billion senior secured revolving credit facility (the “Credit Agreement”) expiring in July 2022 . The Credit Agreement is available to fund capital expenditures, investments, acquisitions, distribution payments and working capital and for general partnership purposes. The Credit Agreement is also available to fund letters of credit up to a $50 million sub-limit, and it contains an accordion feature giving us the ability to increase the size of the facility by up to $300 million with additional lender commitments. Our obligations under the Credit Agreement are collateralized by substantially all of our assets, and indebtedness under the Credit Agreement is guaranteed by our material, wholly-owned subsidiaries. The Credit Agreement requires us to maintain compliance with certain financial covenants consisting of total leverage, senior secured leverage, and interest coverage. It also limits or restricts our ability to engage in certain activities. If, at any time prior to the expiration of the Credit Agreement, HEP obtains two investment grade credit ratings, the Credit Agreement will become unsecured and many of the covenants, limitations, and restrictions will be eliminated. We may prepay all loans at any time without penalty, except for tranche breakage costs. If an event of default exists under the Credit Agreement, the lenders will be able to accelerate the maturity of all loans outstanding and exercise other rights and remedies. We were in compliance with the covenants as of September 30, 2018 . Senior Notes On July 19, 2016, we closed a private placement of $400 million in aggregate principal amount of 6% senior unsecured notes due in 2024 (the “ 6% Senior Notes”). On September 22, 2017, we closed a private placement of an additional $100 million in aggregate principal amount of the 6% Senior Notes for a combined aggregate principal amount outstanding of $500 million maturing in 2024 . The 6% Senior Notes are unsecured and impose certain restrictive covenants, 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. We were in compliance with the restrictive covenants for the 6% Senior Notes as of September 30, 2018 . At any time when the 6% 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% Senior Notes. Indebtedness under the 6% Senior Notes is guaranteed by our wholly-owned subsidiaries. On January 4, 2017, we redeemed the $300 million aggregate principal amount of 6.5% senior notes due in 2020 (the “6.5% Senior Notes”) at a redemption cost of $309.8 million at which time we recognized a $12.2 million early extinguishment loss consisting of a $9.8 million debt redemption premium and unamortized discount and financing costs of $2.4 million . We funded the redemption with borrowings under our Credit Agreement. Long-term Debt The carrying amounts of our long-term debt are as follows: September 30, December 31, (In thousands) Credit Agreement Amount outstanding $ 921,000 $ 1,012,000 6% Senior Notes Principal 500,000 500,000 Unamortized premium and debt issuance costs (4,252 ) (4,692 ) 495,748 495,308 Total long-term debt $ 1,416,748 $ 1,507,308 Interest Rate Risk Management The two interest rate swaps that hedged our exposure to the cash flow risk caused by the effects of LIBOR changes on $150 million of Credit Agreement advances matured on July 31, 2017. The swaps had effectively converted $150 million of our LIBOR based debt to fixed rate debt. Interest Expense and Other Debt Information Interest expense consists of the following components: Nine Months Ended September 30, 2018 2017 (In thousands) Interest on outstanding debt: Credit Agreement, net of interest on interest rate swaps $ 27,233 $ 20,338 6.5% Senior Notes — 163 6% Senior Notes 22,500 18,150 Amortization of discount and deferred debt issuance costs 2,277 2,317 Commitment fees and other 1,450 1,137 Total interest incurred 53,460 42,105 Less capitalized interest 211 746 Net interest expense $ 53,249 $ 41,359 Cash paid for interest $ 58,697 $ 53,181 Capital Lease Obligations We have capital lease obligations related to vehicle leases with initial terms of 33 to 48 months. The total cost of assets under capital leases was $5.8 million and $5.1 million as of September 30, 2018 and December 31, 2017 , respectively, with accumulated depreciation of $4.0 million and $3.3 million as of September 30, 2018 and December 31, 2017 , respectively. We include depreciation of capital leases in depreciation and amortization in our consolidated statements of income.

Significant Customers

Significant Customers	9 Months Ended
Significant Customers	Sep. 30, 2018
Risks and Uncertainties [Abstract]
Significant Customers	Significant Customers All revenues are domestic revenues, of which 86% are currently generated from our two largest customers: HFC and Delek. The following table presents the percentage of total revenues generated by each of these customers: Three Months Ended Nine Months Ended 2018 2017 2018 2017 HFC 80 % 86 % 79 % 85 % Delek 6 % 7 % 6 % 7 %

Related Party Transactions

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions We serve HFC’s refineries under long-term pipeline, terminal and tankage throughput agreements, and refinery processing unit tolling agreements expiring from 2019 to 2036 . Under these agreements, HFC agrees to transport, store and process throughput volumes of refined product, crude oil and feedstocks on our pipelines, terminals, tankage, loading rack facilities and refinery processing units that result in minimum annual payments to us. These minimum annual payments or revenues are subject to annual rate adjustments on July 1st each year generally based on increases or decreases in PPI or the FERC index. As of September 30, 2018 , these agreements with HFC require minimum annualized payments to us of $335 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 $2.5 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 $100.2 million and $95.1 million for the three months ended September 30, 2018 and 2017 , respectively, and $295.6 million and $277.3 million for the nine months ended September 30, 2018 and 2017 , respectively. • HFC charged us general and administrative services under the Omnibus Agreement of $0.6 million for each of the three months ended September 30, 2018 and 2017 , and $1.9 million and $1.8 million for the nine months ended September 30, 2018 and 2017 , respectively. • We reimbursed HFC for costs of employees supporting our operations of $13.1 million and $11.7 million for the three months ended September 30, 2018 and 2017 , respectively, and $38.3 million and $34.5 million for the nine months ended September 30, 2018 and 2017 , respectively. • HFC reimbursed us $2.8 million and $1.9 million for the three months ended September 30, 2018 and 2017 , respectively, for expense and capital projects and $6.9 million and $4.7 million for the nine months ended September 30, 2018 and 2017 , respectively. • We distributed $36.9 million and $109.7 million in the three and nine months ended September 30, 2018 , respectively, to HFC as regular distributions on its common units and $32.8 million and $94.8 million on its common units and general partner interest, including general partner incentive distributions, in the three and nine months ended September 30, 2017 , respectively. • Accounts receivable from HFC were $47.1 million and $51.5 million at September 30, 2018 , and December 31, 2017 , respectively. • Accounts payable to HFC were $6.4 million and $7.7 million at September 30, 2018 , and December 31, 2017 , respectively. • Deferred revenue in the consolidated balance sheets at September 30, 2018 and December 31, 2017 , includes $2.0 million and $4.4 million , respectively, relating to certain shortfall billings to HFC. It is possible that HFC may not exceed its minimum obligations to receive credit for any of the $2.0 million deferred at September 30, 2018 . • We received lease payments from HFC for use of our Artesia and Tulsa railyards of $0.5 million and $0.1 million for the three months ended September 30, 2018 and 2017 , respectively, and $1.5 million and $0.3 million for the nine months ended September 30, 2018 and 2017 , respectively. • On October 31, 2017, we closed on an equity restructuring transaction with HEP Logistics, a wholly-owned subsidiary of HFC and the general partner of HEP, pursuant to which the incentive distribution rights held by HEP Logistics were canceled, and HEP Logistics' 2% general partner interest in HEP was converted into a non-economic general partner interest in HEP. In consideration, we issued 37,250,000 of our common units to HEP Logistics. In addition, HEP Logistics agreed to waive $2.5 million of limited partner cash distributions for each of twelve consecutive quarters beginning with the first quarter the units issued as consideration were eligible to receive distributions.

Partners' Equity, Income Alloca

Partners' Equity, Income Allocations and Cash Distributions	9 Months Ended
Partners' Equity, Income Allocations and Cash Distributions	Sep. 30, 2018
Partners' Capital [Abstract]
Partners' Equity, Income Allocations and Cash Distributions	Partners’ Equity, Income Allocations and Cash Distributions As of September 30, 2018 , HFC held 59,630,030 of our common units, constituting a 57% limited partner interest in us, and held the non-economic general partner interest. Additionally, HEP Logistics, our general partner, owned all incentive distribution rights through October 31, 2017, at which time we closed on an equity restructuring transaction with HEP Logistics pursuant to which the incentive distribution rights were canceled. See Note 1 for a description of this equity restructuring transaction. On January 25, 2018, we entered into a common unit purchase agreement in which certain purchasers agreed to purchase in a private placement 3,700,000 common units representing limited partnership interests, at a price of $29.73 per common unit. The private placement closed on February 6, 2018, and we received proceeds of approximately $110 million , which were used to repay indebtedness under our Credit Agreement. Continuous Offering Program We have a continuous offering program under which we may issue and sell common units from time to time, representing limited partner interests, up to an aggregate gross sales amount of $200 million . For the nine months ended September 30, 2018 , HEP issued 171,246 units under this program, providing approximately $5.2 million in gross proceeds. As of September 30, 2018 , HEP has issued 2,413,153 units under this program, providing $82.3 million in gross proceeds. We intend to use our net proceeds for general partnership purposes, which may include funding working capital, repayment of debt, acquisitions and capital expenditures. Amounts repaid under our credit facility may be reborrowed from time to time. Allocations of Net Income Net income attributable to HEP is allocated to the partners based on their weighted-average ownership percentage during the period. Prior to the equity restructuring of the general partner interest owned by HEP Logistics described in Note 1 that occurred on October 31, 2017, net income attributable to HEP was 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 included incentive distributions that were declared subsequent to quarter end. After incentive distributions and other priority allocations were allocated to the general partner, the remaining net income attributable to HEP was 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 Nine Months Ended 2018 2017 2018 2017 (In thousands) General partner interest in net income $ — $ (419 ) $ — $ 919 General partner incentive distribution — — — 34,128 Total general partner interest in net income $ — $ (419 ) $ — $ 35,047 Cash Distributions On October 19, 2018 , we announced our cash distribution for the third quarter of 2018 of $0.665 per unit. The distribution is payable on all common units and will be paid November 8, 2018 , to all unitholders of record on October 29, 2018 . However, HEP Logistics will waive $2.5 million in limited partner cash distributions in accordance with the equity restructuring discussed in Note 1. Prior to the equity restructuring of the general partner interest owned by HEP Logistics that occurred on October 31, 2017, our general partner, HEP Logistics, was entitled to incentive distributions if the amount we distributed with respect to any quarter exceeded specified target levels. After the restructuring of the general partner interest, the general partner interest was no longer entitled to any distributions. 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 Nine Months Ended 2018 2017 2018 2017 (In thousands, except per unit data) General partner interest in distribution $ — $ — $ — $ 2,335 General partner incentive distribution — — — 34,128 Total general partner distribution — — — 36,463 Limited partner distribution 67,669 63,012 201,310 143,326 Total regular quarterly cash distribution $ 67,669 $ 63,012 $ 201,310 $ 179,789 Cash distribution per unit applicable to limited partners $ 0.6650 $ 0.6450 $ 1.9800 $ 1.8975 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.

Net Income per Limited Partner

Net Income per Limited Partner Unit	9 Months Ended
Net Income per Limited Partner Unit	Sep. 30, 2018
Net Income per Limited Partner Unit [Abstract]
Net Income Per Limited Partner Unit	Net Income Per Limited Partner Unit Net income per unit applicable to the limited partners is computed using the two-class method, since we have more than one participating security (common units and restricted units). Prior to the equity restructuring transaction described in Note 1, which was effective October 31, 2017, we had participating securities which included the aforementioned common units and restricted units as well as general partner units and IDRs. After the equity restructuring, the general partner interest was no longer entitled to any distributions, and none were made on the general partner interest after October 31, 2017. To the extent net income attributable to the partners exceeds or is less than cash distributions, this difference is allocated to the partners based on their weighted-average ownership percentage during the period, after consideration of any priority allocations of earnings. Our dilutive securities, restricted units, are immaterial for all periods presented. For purposes of applying the two-class method, including the allocation of cash distributions in excess of earnings, net income per limited partner unit is computed as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Net income attributable to the partners $ 45,003 $ 42,071 $ 131,314 $ 108,970 Less: General partner’s distribution declared (including IDRs) — — — (36,463 ) Limited partner’s distribution declared on common units (67,669 ) (63,012 ) (201,310 ) (143,326 ) Distributions in excess of net income attributable to the partners $ (22,666 ) $ (20,941 ) $ (69,996 ) $ (70,819 ) General Partner (including IDRs) Limited Partners’ Common Units Total (In thousands, except per unit data) Three Months Ended September 30, 2018 Net income attributable to the partners: Distributions declared $ — $ 67,669 $ 67,669 Distributions in excess of net income attributable to the partners — (22,666 ) (22,666 ) Net income attributable to the partners $ — $ 45,003 $ 45,003 Weighted average limited partners' units outstanding 105,440 Limited partners' per unit interest in earnings - basic and diluted $ 0.43 Three Months Ended September 30, 2017 Net income attributable to the partners: Distributions declared $ — $ 63,012 $ 63,012 Distributions in excess of net income attributable to the partners (419 ) (20,522 ) (20,941 ) Net income attributable to the partners $ (419 ) $ 42,490 $ 42,071 Weighted average limited partners' units outstanding 64,319 Limited partners' per unit interest in earnings - basic and diluted $ 0.66 General Partner (including IDRs) Limited Partners’ Common Units Total (In thousands, except per unit data) Nine Months Ended September 30, 2018 Net income attributable to partnership: Distributions declared $ — $ 201,310 $ 201,310 Distributions in excess of net income attributable to the partners — (69,996 ) (69,996 ) Net income attributable to the partners $ — $ 131,314 $ 131,314 Weighted average limited partners' units outstanding 104,908 Limited partners' per unit interest in earnings - basic and diluted $ 1.25 Nine Months Ended September 30, 2017 Net income attributable to partnership: Distributions declared $ 36,463 $ 143,326 $ 179,789 Distributions in excess of net income attributable to the partners (1,416 ) (69,403 ) (70,819 ) Net income attributable to the partners $ 35,047 $ 73,923 $ 108,970 Weighted average limited partners' units outstanding 63,845 Limited partners' per unit interest in earnings - basic and diluted $ 1.16

Environmental

Environmental	9 Months Ended
Environmental	Sep. 30, 2018
Accrual for Environmental Loss Contingencies [Abstract]
Environmental	Environmental We expensed $0.1 million and $0.4 million for the three and nine months ended September 30, 2018 , respectively, for environmental remediation obligations, and we incurred no expenses for the three and nine months ended September 30, 2017. The accrued environmental liability, net of expected recoveries from indemnifying parties, reflected in our consolidated balance sheets was $6.1 million and $6.5 million at September 30, 2018 and December 31, 2017 , respectively, of which $4.3 million and $5.0 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 September 30, 2018 and December 31, 2017 , our consolidated balance sheets included additional accrued environmental liabilities of $0.6 million and $0.8 million , respectively, for HFC indemnified liabilities, and other assets included equal and offsetting balances representing amounts due from HFC related to indemnifications for environmental remediation liabilities.

Contingencies

Contingencies	9 Months Ended
Contingencies	Sep. 30, 2018
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 operations or cash flows.

Operating Segments

Operating Segments	9 Months Ended
Operating Segments	Sep. 30, 2018
Segment Reporting [Abstract]
Operating Segments	Segment Information Although financial information is reviewed by our chief operating decision makers from a variety of perspectives, they view the business in two operating segments: pipelines and terminals, and refinery processing units. These operating segments adhere to the accounting polices used for our consolidated financial statements. The pipelines and terminals operating segments have been aggregated into one reportable segment as both pipeline and terminals (1) have similar economic characteristics, (2) similarly provide logistics services of transportation and storage of petroleum products, (3) similarly support the petroleum refining business, including distribution of its products, (4) have principally the same customers and (5) are subject to similar regulatory requirements. We evaluate the performance of each segment based on its respective operating income. Certain general and administrative expenses and interest and financing costs are excluded from segment operating income as they are not directly attributable to a specific operating segment. Identifiable assets are those used by the segment, whereas other assets are principally equity method investments, cash, deposits and other assets that are not associated with a specific reportable operating segment. Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Revenues: Pipelines and terminals - affiliate $ 80,608 $ 74,547 $ 238,680 $ 219,806 Pipelines and terminals - third-party 25,596 15,226 77,799 47,826 Refinery processing units - affiliate 19,580 20,591 56,949 57,510 Total segment revenues $ 125,784 $ 110,364 $ 373,428 $ 325,142 Segment operating income: Pipelines and terminals $ 56,531 $ 44,896 $ 167,748 $ 140,546 Refinery processing units 8,890 10,463 24,832 24,283 Total segment operating income 65,421 55,359 192,580 164,829 Unallocated general and administrative expenses (2,498 ) (3,623 ) (8,293 ) (8,872 ) Interest and financing costs, net (17,502 ) (13,971 ) (51,668 ) (53,278 ) Equity in earnings of unconsolidated affiliates 1,114 5,072 4,127 10,965 Gain on sale of assets and other 38 155 71 317 Income before income taxes $ 46,573 $ 42,992 $ 136,817 $ 113,961 Capital Expenditures: Pipelines and terminals $ 9,389 $ 10,151 $ 34,128 $ 30,437 Refinery processing units 142 — 142 238 Total capital expenditures $ 9,531 $ 10,151 $ 34,270 $ 30,675 September 30, 2018 December 31, 2017 (In thousands) Identifiable assets: Pipelines and terminals (1) $ 1,692,679 $ 1,728,074 Refinery processing units 317,919 328,585 Other 96,444 97,455 Total identifiable assets $ 2,107,042 $ 2,154,114 (1) Includes goodwill of $270.3 million and $266.7 million as of September 30, 2018 and December 31, 2017 , respectively.

Supplemental Guarantor _ Non-Gu

Supplemental Guarantor / Non-Guarantor Financial Information	9 Months Ended
	Sep. 30, 2018
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 6% 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 September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ 2 $ 1,639 $ 4,734 $ — $ 6,375 Accounts receivable — 52,218 5,438 (246 ) 57,410 Prepaid and other current assets 85 2,253 375 — 2,713 Total current assets 87 56,110 10,547 (246 ) 66,498 Properties and equipment, net — 1,190,867 349,846 — 1,540,713 Investment in subsidiaries 1,859,722 266,162 — (2,125,884 ) — Intangible assets, net — 118,831 — — 118,831 Goodwill — 270,336 — — 270,336 Equity method investments — 83,911 — — 83,911 Other assets 9,897 16,856 — — 26,753 Total assets $ 1,869,706 $ 2,003,073 $ 360,393 $ (2,126,130 ) $ 2,107,042 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 15,574 $ 1,074 $ (246 ) $ 16,402 Accrued interest 5,730 — — — 5,730 Deferred revenue — 11,228 1,132 — 12,360 Accrued property taxes — 4,346 3,052 — 7,398 Other current liabilities 22 3,670 2 — 3,694 Total current liabilities 5,752 34,818 5,260 (246 ) 45,584 Long-term debt 1,416,748 — — — 1,416,748 Other long-term liabilities 260 14,745 250 — 15,255 Deferred revenue — 48,408 — — 48,408 Class B unit — 45,380 — — 45,380 Equity - partners 446,946 1,859,722 266,162 (2,125,884 ) 446,946 Equity - noncontrolling interest — — 88,721 — 88,721 Total liabilities and equity $ 1,869,706 $ 2,003,073 $ 360,393 $ (2,126,130 ) $ 2,107,042 Condensed Consolidating Balance Sheet December 31, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ 2 $ 511 $ 7,263 $ — $ 7,776 Accounts receivable — 59,448 5,038 (182 ) 64,304 Prepaid and other current assets 13 2,016 282 — 2,311 Total current assets 15 61,975 12,583 (182 ) 74,391 Properties and equipment, net — 1,213,626 355,845 — 1,569,471 Investment in subsidiaries 1,902,285 273,319 — (2,175,604 ) — Intangible assets, net — 129,463 — — 129,463 Goodwill — 266,716 — — 266,716 Equity method investments — 85,279 — — 85,279 Other assets 11,753 17,041 — — 28,794 Total assets $ 1,914,053 $ 2,047,419 $ 368,428 $ (2,175,786 ) $ 2,154,114 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 20,928 $ 1,526 $ (182 ) $ 22,272 Accrued interest 12,500 756 — — 13,256 Deferred revenue — 8,540 1,058 — 9,598 Accrued property taxes — 3,431 1,221 — 4,652 Other current liabilities — 5,707 — — 5,707 Total current liabilities 12,500 39,362 3,805 (182 ) 55,485 Long-term debt 1,507,308 — — — 1,507,308 Other long-term liabilities 286 15,359 198 — 15,843 Deferred revenue — 47,272 — — 47,272 Class B unit — 43,141 — — 43,141 Equity - partners 393,959 1,902,285 273,319 (2,175,604 ) 393,959 Equity - noncontrolling interest — — 91,106 — 91,106 Total liabilities and equity $ 1,914,053 $ 2,047,419 $ 368,428 $ (2,175,786 ) $ 2,154,114 Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 94,270 $ 5,918 $ — $ 100,188 Third parties — 21,277 4,319 — 25,596 — 115,547 10,237 — 125,784 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 32,906 3,090 — 35,996 Depreciation and amortization 20,198 4,169 — 24,367 General and administrative 698 1,800 — — 2,498 698 54,904 7,259 — 62,861 Operating income (loss) (698 ) 60,643 2,978 — 62,923 Other income (expense): Equity in earnings of subsidiaries 63,731 2,251 — (65,982 ) — Equity in earnings of equity method investments — 1,114 — — 1,114 Interest expense (18,030 ) (12 ) — — (18,042 ) Interest income — 540 — — 540 Gain on sale of assets and other — 14 24 — 38 45,701 3,907 24 (65,982 ) (16,350 ) Income before income taxes 45,003 64,550 3,002 (65,982 ) 46,573 State income tax expense — (39 ) — — (39 ) Net income 45,003 64,511 3,002 (65,982 ) 46,534 Allocation of net income attributable to noncontrolling interests — (780 ) (751 ) — (1,531 ) Net income attributable to the partners 45,003 63,731 2,251 (65,982 ) 45,003 Other comprehensive income — — — — — Comprehensive income attributable to the partners $ 45,003 $ 63,731 $ 2,251 $ (65,982 ) $ 45,003 Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 89,772 $ 5,366 $ — $ 95,138 Third parties — 10,758 4,468 — 15,226 — 100,530 9,834 — 110,364 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 31,360 4,638 — 35,998 Depreciation and amortization — 14,854 4,153 — 19,007 General and administrative 1,050 2,573 — — 3,623 1,050 48,787 8,791 — 58,628 Operating income (loss) (1,050 ) 51,743 1,043 — 51,736 Other income (expense): Equity in earnings of subsidiaries 57,193 783 — (57,976 ) — Equity in earnings of equity method investments — 5,072 — — 5,072 Interest expense (14,072 ) — — — (14,072 ) Interest income — 101 — — 101 Gain on sale of assets and other — 154 1 — 155 43,121 6,110 1 (57,976 ) (8,744 ) Income before income taxes 42,071 57,853 1,044 (57,976 ) 42,992 State income tax expense — 69 — — 69 Net income 42,071 57,922 1,044 (57,976 ) 43,061 Allocation of net income attributable to noncontrolling interests — (729 ) (261 ) — (990 ) Net income attributable to the partners 42,071 57,193 783 (57,976 ) 42,071 Other comprehensive income (63 ) (63 ) — 63 (63 ) Comprehensive income attributable to the partners $ 42,008 $ 57,130 $ 783 $ (57,913 ) $ 42,008 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 278,083 $ 17,546 $ — $ 295,629 Third parties — 60,795 17,004 — 77,799 — 338,878 34,550 — 373,428 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 97,064 9,667 — 106,731 Depreciation and amortization — 61,630 12,487 — 74,117 General and administrative 2,739 5,554 — — 8,293 2,739 164,248 22,154 — 189,141 Operating income (loss) (2,739 ) 174,630 12,396 — 184,287 Other income (expense): Equity in earnings (loss) of subsidiaries 187,349 9,344 — (196,693 ) — Equity in earnings of equity method investments — 4,127 — — 4,127 Interest expense (53,341 ) 92 — — (53,249 ) Interest income — 1,581 — — 1,581 Gain (loss) on sale of assets and other 45 (37 ) 63 — 71 134,053 15,107 63 (196,693 ) (47,470 ) Income (loss) before income taxes 131,314 189,737 12,459 (196,693 ) 136,817 State income tax expense — (149 ) — — (149 ) Net income (loss) 131,314 189,588 12,459 (196,693 ) 136,668 Allocation of net income attributable to noncontrolling interests — (2,239 ) (3,115 ) — (5,354 ) Net income (loss) attributable to Holly Energy Partners 131,314 187,349 9,344 (196,693 ) 131,314 Other comprehensive income (loss) — — — — — Comprehensive income (loss) $ 131,314 $ 187,349 $ 9,344 $ (196,693 ) $ 131,314 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 258,571 $ 18,745 $ — $ 277,316 Third parties — 32,146 15,680 — 47,826 — 290,717 34,425 — 325,142 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 91,323 11,261 — 102,584 Depreciation and amortization — 45,498 12,231 — 57,729 General and administrative 3,070 5,802 — — 8,872 3,070 142,623 23,492 — 169,185 Operating income (loss) (3,070 ) 148,094 10,933 — 155,957 Other income (expense): Equity in earnings (loss) of subsidiaries 165,624 8,203 — (173,827 ) — Equity in earnings of equity method investments — 10,965 — — 10,965 Interest expense (41,359 ) — — — (41,359 ) Interest income — 306 — — 306 Loss on early extinguishment of debt (12,225 ) — — — (12,225 ) Gain (loss) on sale of assets and other — 313 4 — 317 112,040 19,787 4 (173,827 ) (41,996 ) Income (loss) before income taxes 108,970 167,881 10,937 (173,827 ) 113,961 State income tax expense — (164 ) — — (164 ) Net income (loss) 108,970 167,717 10,937 (173,827 ) 113,797 Allocation of net income attributable to noncontrolling interests — (2,093 ) (2,734 ) — (4,827 ) Net income (loss) attributable to Holly Energy Partners 108,970 165,624 8,203 (173,827 ) 108,970 Other comprehensive income (loss) (91 ) (91 ) — 91 (91 ) Comprehensive income (loss) $ 108,879 $ 165,533 $ 8,203 $ (173,736 ) $ 108,879 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (58,326 ) $ 259,360 $ 25,722 $ (9,344 ) $ 217,412 Cash flows from investing activities Additions to properties and equipment — (28,057 ) (6,213 ) — (34,270 ) Business and asset acquisitions — (6,803 ) (38 ) — (6,841 ) Distributions from UNEV in excess of earnings — 7,156 — (7,156 ) — Proceeds from sale of assets — 210 — — 210 Distributions in excess of equity in earnings of equity investments — 1,368 — — 1,368 — (26,126 ) (6,251 ) (7,156 ) (39,533 ) Cash flows from financing activities Net repayments under credit agreement (91,000 ) — — — (91,000 ) Net intercompany financing activities 231,231 (231,231 ) — — — Proceeds from issuance of common units 114,839 48 — — 114,887 Contribution from general partner 614 — — — 614 Distributions to HEP unitholders (197,300 ) — — — (197,300 ) Distributions to noncontrolling interests — — (22,000 ) 16,500 (5,500 ) Units withheld for tax withholding obligations (58 ) — — — (58 ) Other — (923 ) — — (923 ) 58,326 (232,106 ) (22,000 ) 16,500 (179,280 ) Cash and cash equivalents Increase (decrease) for the period — 1,128 (2,529 ) — (1,401 ) Beginning of period 2 511 7,263 — 7,776 End of period $ 2 $ 1,639 $ 4,734 $ — $ 6,375 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (57,010 ) $ 215,608 $ 27,064 $ (8,203 ) $ 177,459 Cash flows from investing activities Additions to properties and equipment — (27,725 ) (2,950 ) — (30,675 ) Proceeds from sale of assets — 794 — — 794 Distributions from UNEV in excess of earnings — 6,797 — (6,797 ) — Distributions in excess of equity in earnings of equity investments — 1,224 — — 1,224 — (18,910 ) (2,950 ) (6,797 ) (28,657 ) Cash flows from financing activities Net borrowings under credit agreement 750,000 (553,000 ) — — 197,000 Net intercompany financing activities (357,196 ) 357,196 — — — Proceeds from issuance of 6% Senior Notes 103,250 (1,500 ) — — 101,750 Redemption of senior notes (309,750 ) — — — (309,750 ) Proceeds from issuance of common units 52,285 — — — 52,285 Distributions to HEP unitholders (171,560 ) — — — (171,560 ) Distributions to noncontrolling interests — — (20,000 ) 15,000 (5,000 ) Distribution to HFC for El Dorado tanks (103 ) — — — (103 ) Contributions from general partner 1,072 — — — 1,072 Units withheld for tax withholding obligations (35 ) — — — (35 ) Deferred financing costs (10,953 ) 1,500 — — (9,453 ) Other — (1,189 ) — — (1,189 ) 57,010 (196,993 ) (20,000 ) 15,000 (144,983 ) Cash and cash equivalents Decrease for the period — (295 ) 4,114 — 3,819 Beginning of period 2 301 3,354 — 3,657 End of period $ 2 $ 6 $ 7,468 $ — $ 7,476

Description of Business and P_2

Description of Business and Presentation of Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Consolidation, Policy	Principles of Consolidation and Common Control Transactions The consolidated financial statements include our accounts and those of subsidiaries and joint ventures that we control. All significant intercompany transactions and balances have been eliminated. Most of our acquisitions from HFC occurred while we were a consolidated variable interest entity (“VIE”) of HFC. Therefore, as an entity under common control with HFC, we recorded these acquisitions on our balance sheets at HFC's historical basis instead of our purchase price or fair value.
Share-based Compensation, Option and Incentive Plans, Policy	Share-Based Compensation In March 2016, an accounting standard update was issued which simplifies the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. We adopted this standard effective January 1, 2017, with no impact to our financial condition or results of operations. The new standard also requires that employee taxes paid when an employer withholds units for tax withholding purposes be reported as financing activities in the statement of cash flows on a retrospective basis. Previously, this activity was included in our operating activities. The impact of this change for the nine months ended September 30, 2017 was not material to our consolidated statement of cash flows. Finally, consistent with our existing policy, we have elected to account for forfeitures on an estimated basis.
New Accounting Pronouncements, Policy	Accounting Pronouncements Not Yet Adopted Leases In February 2016, an accounting standard update was issued requiring leases to be measured and recognized as a lease liability, with a corresponding right-of-use asset on the balance sheet. This standard has an effective date of January 1, 2019, and we plan to apply practical expedients provided in the standards update that allow us, among other things, not to reassess contracts that commenced prior to the adoption. While we continue to evaluate the provisions of the standard to determine how it will affect our financial statements, the primary effect of adopting the new standard will be to record assets and obligations for current operating leases. Adoption of the standard is not expected to have a material impact on our results of operations or cash flows. In preparing for adoption, we have identified, reviewed and evaluated contracts containing lease and embedded lease arrangements. Additionally, we have acquired and are finalizing the implementation of software and are implementing systems to facilitate lease capture and related accounting treatment.
Revenue Recognition, Policy	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 had an effective date of January 1, 2018, and we accounted for the new guidance using the modified retrospective implementation method, whereby a cumulative effect adjustment was recorded to retained earnings as of the date of initial application. In preparing for adoption, we evaluated the terms, conditions and performance obligations under our existing contracts with customers. Furthermore, we implemented policies to comply with this new standard. See Note 3 for additional information on our revenue recognition policies.
Business Combinations Policy	Business Combinations In December 2014, an accounting standard update was issued to provide new guidance on the definition of a business in relation to accounting for identifiable intangible assets in business combinations. This standard had an effective date of January 1, 2018, and had no effect on our financial condition, results of operations or cash flows.
Fair Value of Financial Instruments, Policy	Financial Assets and Liabilities In January 2016, an accounting standard update was issued requiring changes in the accounting and disclosures for financial instruments. This standard was effective beginning with our 2018 reporting year and had no effect on our financial condition, results of operations or cash flows.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 30, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes the value of assets and liabilities acquired: (in thousands) Cash and cash equivalents $ 4,609 Accounts receivable 5,164 Prepaid and other current assets 8 Properties and equipment 275,061 Intangible assets 70,182 Goodwill 13,845 Accounts payable (3,598 ) Accrued property taxes (1,438 ) Net assets acquired $ 363,833

Revenues (Tables)

Revenues (Tables)	9 Months Ended
Revenues (Tables)	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Cumulative Effect of Adjustment	The following table reflects the cumulative effect of adoption as of January 1, 2018: Prior to Adoption Increase (Decrease) As Adjusted (In thousands) Deferred revenue $ 9,598 $ (1,320 ) $ 8,278 Partners’ equity: Common unitholders $ 393,959 $ 1,320 $ 395,279
Schedule of Contract Asset and Contract Liability Balances	September 30, January 1, (In thousands) Contract asset $ 1,673 $ — Contract liability $ (5,726 ) $ (2,713 )
Schedule of Future Performance Obligations	We expect to recognize revenue for these unfulfilled performance obligations as shown in the table below (amounts shown in table include both service and lease revenues): Years Ending December 31, (In millions) Remainder of 2018 $ 94 2019 352 2020 305 2021 294 2022 267 Thereafter 1,041 Total $ 2,353
Schedule of Disaggregated Revenue	Disaggregated revenues are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Pipelines $ 69,735 $ 54,072 $ 207,443 $ 161,768 Terminals, tanks and loading racks 36,469 35,701 109,036 105,864 Refinery processing units 19,580 20,591 56,949 57,510 $ 125,784 $ 110,364 $ 373,428 $ 325,142

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
Financial Instruments (Tables)	Sep. 30, 2018
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 were as follows: September 30, 2018 December 31, 2017 Financial Instrument Fair Value Input Level Carrying Value Fair Value Carrying Value Fair Value (In thousands) Liabilities: 6% Senior Notes Level 2 495,748 512,840 495,308 525,120 $ 495,748 $ 512,840 $ 495,308 $ 525,120

Properties and Equipment (Table

Properties and Equipment (Tables)	9 Months Ended
Properties and Equipment (Tables)	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Schedule of Properties and Equipment	The carrying amounts of our properties and equipment are as follows: September 30, December 31, (In thousands) Pipelines, terminals and tankage $ 1,529,683 $ 1,541,722 Refinery assets 347,338 347,338 Land and right of way 85,961 86,484 Construction in progress 52,882 12,029 Other 35,376 35,659 2,051,240 2,023,232 Less accumulated depreciation 510,527 453,761 $ 1,540,713 $ 1,569,471

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
Intangible Assets (Tables)	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets by Major Class	The carrying amounts of our intangible assets are as follows: Useful Life September 30, December 31, (In thousands) Delek transportation agreement 30 years $ 59,933 $ 59,933 HFC transportation agreement 10-15 years 75,131 75,131 Customer relationships 10 years 69,683 69,282 Other 50 50 204,797 204,396 Less accumulated amortization 85,966 74,933 $ 118,831 $ 129,463

Employees, Retirement and Inc_2

Employees, Retirement and Incentive Plans (Tables)	9 Months Ended
Employees, Retirement and Incentive Plans (Tables)	Sep. 30, 2018
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 nine months ended September 30, 2018 , is presented below: Restricted and Phantom Units Units Weighted Average Grant-Date Fair Value Outstanding at January 1, 2018 (nonvested) 119,009 $ 34.77 Granted 12,890 30.23 Forfeited (1,664 ) 34.64 Outstanding at September 30, 2018 (nonvested) 130,235 $ 34.33
Schedule of Nonvested Performance-based Units Activity	A summary of performance unit activity and changes for the nine months ended September 30, 2018 , is presented below: Performance Units Units Outstanding at January 1, 2018 (nonvested) 36,911 Granted 2,764 Vesting and transfer of common units to recipients (4,283 ) Outstanding at September 30, 2018 (nonvested) 35,392

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2018
Debt Instruments [Abstract]
Schedule of Long-term Debt Instruments	The carrying amounts of our long-term debt are as follows: September 30, December 31, (In thousands) Credit Agreement Amount outstanding $ 921,000 $ 1,012,000 6% Senior Notes Principal 500,000 500,000 Unamortized premium and debt issuance costs (4,252 ) (4,692 ) 495,748 495,308 Total long-term debt $ 1,416,748 $ 1,507,308
Schedule of Interest Expense and Other Debt Information	Interest expense consists of the following components: Nine Months Ended September 30, 2018 2017 (In thousands) Interest on outstanding debt: Credit Agreement, net of interest on interest rate swaps $ 27,233 $ 20,338 6.5% Senior Notes — 163 6% Senior Notes 22,500 18,150 Amortization of discount and deferred debt issuance costs 2,277 2,317 Commitment fees and other 1,450 1,137 Total interest incurred 53,460 42,105 Less capitalized interest 211 746 Net interest expense $ 53,249 $ 41,359 Cash paid for interest $ 58,697 $ 53,181

Significant Customers (Tables)

Significant Customers (Tables)	9 Months Ended
Significant Customers (Tables)	Sep. 30, 2018
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 Nine Months Ended 2018 2017 2018 2017 HFC 80 % 86 % 79 % 85 % Delek 6 % 7 % 6 % 7 %

Partners' Equity, Income Allo_2

Partners' Equity, Income Allocations and Cash Distributions (Tables)	9 Months Ended
	Sep. 30, 2018
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 Nine Months Ended 2018 2017 2018 2017 (In thousands) General partner interest in net income $ — $ (419 ) $ — $ 919 General partner incentive distribution — — — 34,128 Total general partner interest in net income $ — $ (419 ) $ — $ 35,047
Schedule of Distributions Made to 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 Nine Months Ended 2018 2017 2018 2017 (In thousands, except per unit data) General partner interest in distribution $ — $ — $ — $ 2,335 General partner incentive distribution — — — 34,128 Total general partner distribution — — — 36,463 Limited partner distribution 67,669 63,012 201,310 143,326 Total regular quarterly cash distribution $ 67,669 $ 63,012 $ 201,310 $ 179,789 Cash distribution per unit applicable to limited partners $ 0.6650 $ 0.6450 $ 1.9800 $ 1.8975

Net Income per Limited Partne_2

Net Income per Limited Partner Unit (Tables)	9 Months Ended
Net Income per Limited Partner Unit (Tables)	Sep. 30, 2018
Net Income per Limited Partner Unit [Abstract]
Schedule of Allocation to Limited Partner Interest in Net Income	For purposes of applying the two-class method, including the allocation of cash distributions in excess of earnings, net income per limited partner unit is computed as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Net income attributable to the partners $ 45,003 $ 42,071 $ 131,314 $ 108,970 Less: General partner’s distribution declared (including IDRs) — — — (36,463 ) Limited partner’s distribution declared on common units (67,669 ) (63,012 ) (201,310 ) (143,326 ) Distributions in excess of net income attributable to the partners $ (22,666 ) $ (20,941 ) $ (69,996 ) $ (70,819 )
Earnings per Unit by Type of Partner	General Partner (including IDRs) Limited Partners’ Common Units Total (In thousands, except per unit data) Three Months Ended September 30, 2018 Net income attributable to the partners: Distributions declared $ — $ 67,669 $ 67,669 Distributions in excess of net income attributable to the partners — (22,666 ) (22,666 ) Net income attributable to the partners $ — $ 45,003 $ 45,003 Weighted average limited partners' units outstanding 105,440 Limited partners' per unit interest in earnings - basic and diluted $ 0.43 Three Months Ended September 30, 2017 Net income attributable to the partners: Distributions declared $ — $ 63,012 $ 63,012 Distributions in excess of net income attributable to the partners (419 ) (20,522 ) (20,941 ) Net income attributable to the partners $ (419 ) $ 42,490 $ 42,071 Weighted average limited partners' units outstanding 64,319 Limited partners' per unit interest in earnings - basic and diluted $ 0.66 General Partner (including IDRs) Limited Partners’ Common Units Total (In thousands, except per unit data) Nine Months Ended September 30, 2018 Net income attributable to partnership: Distributions declared $ — $ 201,310 $ 201,310 Distributions in excess of net income attributable to the partners — (69,996 ) (69,996 ) Net income attributable to the partners $ — $ 131,314 $ 131,314 Weighted average limited partners' units outstanding 104,908 Limited partners' per unit interest in earnings - basic and diluted $ 1.25 Nine Months Ended September 30, 2017 Net income attributable to partnership: Distributions declared $ 36,463 $ 143,326 $ 179,789 Distributions in excess of net income attributable to the partners (1,416 ) (69,403 ) (70,819 ) Net income attributable to the partners $ 35,047 $ 73,923 $ 108,970 Weighted average limited partners' units outstanding 63,845 Limited partners' per unit interest in earnings - basic and diluted $ 1.16

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
Operating Segments (Tables)	Sep. 30, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three Months Ended Nine Months Ended 2018 2017 2018 2017 (In thousands) Revenues: Pipelines and terminals - affiliate $ 80,608 $ 74,547 $ 238,680 $ 219,806 Pipelines and terminals - third-party 25,596 15,226 77,799 47,826 Refinery processing units - affiliate 19,580 20,591 56,949 57,510 Total segment revenues $ 125,784 $ 110,364 $ 373,428 $ 325,142 Segment operating income: Pipelines and terminals $ 56,531 $ 44,896 $ 167,748 $ 140,546 Refinery processing units 8,890 10,463 24,832 24,283 Total segment operating income 65,421 55,359 192,580 164,829 Unallocated general and administrative expenses (2,498 ) (3,623 ) (8,293 ) (8,872 ) Interest and financing costs, net (17,502 ) (13,971 ) (51,668 ) (53,278 ) Equity in earnings of unconsolidated affiliates 1,114 5,072 4,127 10,965 Gain on sale of assets and other 38 155 71 317 Income before income taxes $ 46,573 $ 42,992 $ 136,817 $ 113,961 Capital Expenditures: Pipelines and terminals $ 9,389 $ 10,151 $ 34,128 $ 30,437 Refinery processing units 142 — 142 238 Total capital expenditures $ 9,531 $ 10,151 $ 34,270 $ 30,675 September 30, 2018 December 31, 2017 (In thousands) Identifiable assets: Pipelines and terminals (1) $ 1,692,679 $ 1,728,074 Refinery processing units 317,919 328,585 Other 96,444 97,455 Total identifiable assets $ 2,107,042 $ 2,154,114 (1) Includes goodwill of $270.3 million and $266.7 million as of September 30, 2018 and December 31, 2017 , respectively.

Supplemental Guarantor _ Non-_2

Supplemental Guarantor / Non-Guarantor Financial Information (Tables)	9 Months Ended
	Sep. 30, 2018
Supplemental Guarantor / Non-Guarantor Financial Information [Abstract]
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ 2 $ 1,639 $ 4,734 $ — $ 6,375 Accounts receivable — 52,218 5,438 (246 ) 57,410 Prepaid and other current assets 85 2,253 375 — 2,713 Total current assets 87 56,110 10,547 (246 ) 66,498 Properties and equipment, net — 1,190,867 349,846 — 1,540,713 Investment in subsidiaries 1,859,722 266,162 — (2,125,884 ) — Intangible assets, net — 118,831 — — 118,831 Goodwill — 270,336 — — 270,336 Equity method investments — 83,911 — — 83,911 Other assets 9,897 16,856 — — 26,753 Total assets $ 1,869,706 $ 2,003,073 $ 360,393 $ (2,126,130 ) $ 2,107,042 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 15,574 $ 1,074 $ (246 ) $ 16,402 Accrued interest 5,730 — — — 5,730 Deferred revenue — 11,228 1,132 — 12,360 Accrued property taxes — 4,346 3,052 — 7,398 Other current liabilities 22 3,670 2 — 3,694 Total current liabilities 5,752 34,818 5,260 (246 ) 45,584 Long-term debt 1,416,748 — — — 1,416,748 Other long-term liabilities 260 14,745 250 — 15,255 Deferred revenue — 48,408 — — 48,408 Class B unit — 45,380 — — 45,380 Equity - partners 446,946 1,859,722 266,162 (2,125,884 ) 446,946 Equity - noncontrolling interest — — 88,721 — 88,721 Total liabilities and equity $ 1,869,706 $ 2,003,073 $ 360,393 $ (2,126,130 ) $ 2,107,042 Condensed Consolidating Balance Sheet December 31, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) ASSETS Current assets: Cash and cash equivalents $ 2 $ 511 $ 7,263 $ — $ 7,776 Accounts receivable — 59,448 5,038 (182 ) 64,304 Prepaid and other current assets 13 2,016 282 — 2,311 Total current assets 15 61,975 12,583 (182 ) 74,391 Properties and equipment, net — 1,213,626 355,845 — 1,569,471 Investment in subsidiaries 1,902,285 273,319 — (2,175,604 ) — Intangible assets, net — 129,463 — — 129,463 Goodwill — 266,716 — — 266,716 Equity method investments — 85,279 — — 85,279 Other assets 11,753 17,041 — — 28,794 Total assets $ 1,914,053 $ 2,047,419 $ 368,428 $ (2,175,786 ) $ 2,154,114 LIABILITIES AND EQUITY Current liabilities: Accounts payable $ — $ 20,928 $ 1,526 $ (182 ) $ 22,272 Accrued interest 12,500 756 — — 13,256 Deferred revenue — 8,540 1,058 — 9,598 Accrued property taxes — 3,431 1,221 — 4,652 Other current liabilities — 5,707 — — 5,707 Total current liabilities 12,500 39,362 3,805 (182 ) 55,485 Long-term debt 1,507,308 — — — 1,507,308 Other long-term liabilities 286 15,359 198 — 15,843 Deferred revenue — 47,272 — — 47,272 Class B unit — 43,141 — — 43,141 Equity - partners 393,959 1,902,285 273,319 (2,175,604 ) 393,959 Equity - noncontrolling interest — — 91,106 — 91,106 Total liabilities and equity $ 1,914,053 $ 2,047,419 $ 368,428 $ (2,175,786 ) $ 2,154,114
Condensed Consolidating Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 94,270 $ 5,918 $ — $ 100,188 Third parties — 21,277 4,319 — 25,596 — 115,547 10,237 — 125,784 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 32,906 3,090 — 35,996 Depreciation and amortization 20,198 4,169 — 24,367 General and administrative 698 1,800 — — 2,498 698 54,904 7,259 — 62,861 Operating income (loss) (698 ) 60,643 2,978 — 62,923 Other income (expense): Equity in earnings of subsidiaries 63,731 2,251 — (65,982 ) — Equity in earnings of equity method investments — 1,114 — — 1,114 Interest expense (18,030 ) (12 ) — — (18,042 ) Interest income — 540 — — 540 Gain on sale of assets and other — 14 24 — 38 45,701 3,907 24 (65,982 ) (16,350 ) Income before income taxes 45,003 64,550 3,002 (65,982 ) 46,573 State income tax expense — (39 ) — — (39 ) Net income 45,003 64,511 3,002 (65,982 ) 46,534 Allocation of net income attributable to noncontrolling interests — (780 ) (751 ) — (1,531 ) Net income attributable to the partners 45,003 63,731 2,251 (65,982 ) 45,003 Other comprehensive income — — — — — Comprehensive income attributable to the partners $ 45,003 $ 63,731 $ 2,251 $ (65,982 ) $ 45,003 Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 89,772 $ 5,366 $ — $ 95,138 Third parties — 10,758 4,468 — 15,226 — 100,530 9,834 — 110,364 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 31,360 4,638 — 35,998 Depreciation and amortization — 14,854 4,153 — 19,007 General and administrative 1,050 2,573 — — 3,623 1,050 48,787 8,791 — 58,628 Operating income (loss) (1,050 ) 51,743 1,043 — 51,736 Other income (expense): Equity in earnings of subsidiaries 57,193 783 — (57,976 ) — Equity in earnings of equity method investments — 5,072 — — 5,072 Interest expense (14,072 ) — — — (14,072 ) Interest income — 101 — — 101 Gain on sale of assets and other — 154 1 — 155 43,121 6,110 1 (57,976 ) (8,744 ) Income before income taxes 42,071 57,853 1,044 (57,976 ) 42,992 State income tax expense — 69 — — 69 Net income 42,071 57,922 1,044 (57,976 ) 43,061 Allocation of net income attributable to noncontrolling interests — (729 ) (261 ) — (990 ) Net income attributable to the partners 42,071 57,193 783 (57,976 ) 42,071 Other comprehensive income (63 ) (63 ) — 63 (63 ) Comprehensive income attributable to the partners $ 42,008 $ 57,130 $ 783 $ (57,913 ) $ 42,008 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 278,083 $ 17,546 $ — $ 295,629 Third parties — 60,795 17,004 — 77,799 — 338,878 34,550 — 373,428 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 97,064 9,667 — 106,731 Depreciation and amortization — 61,630 12,487 — 74,117 General and administrative 2,739 5,554 — — 8,293 2,739 164,248 22,154 — 189,141 Operating income (loss) (2,739 ) 174,630 12,396 — 184,287 Other income (expense): Equity in earnings (loss) of subsidiaries 187,349 9,344 — (196,693 ) — Equity in earnings of equity method investments — 4,127 — — 4,127 Interest expense (53,341 ) 92 — — (53,249 ) Interest income — 1,581 — — 1,581 Gain (loss) on sale of assets and other 45 (37 ) 63 — 71 134,053 15,107 63 (196,693 ) (47,470 ) Income (loss) before income taxes 131,314 189,737 12,459 (196,693 ) 136,817 State income tax expense — (149 ) — — (149 ) Net income (loss) 131,314 189,588 12,459 (196,693 ) 136,668 Allocation of net income attributable to noncontrolling interests — (2,239 ) (3,115 ) — (5,354 ) Net income (loss) attributable to Holly Energy Partners 131,314 187,349 9,344 (196,693 ) 131,314 Other comprehensive income (loss) — — — — — Comprehensive income (loss) $ 131,314 $ 187,349 $ 9,344 $ (196,693 ) $ 131,314 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Revenues: Affiliates $ — $ 258,571 $ 18,745 $ — $ 277,316 Third parties — 32,146 15,680 — 47,826 — 290,717 34,425 — 325,142 Operating costs and expenses: Operations (exclusive of depreciation and amortization) — 91,323 11,261 — 102,584 Depreciation and amortization — 45,498 12,231 — 57,729 General and administrative 3,070 5,802 — — 8,872 3,070 142,623 23,492 — 169,185 Operating income (loss) (3,070 ) 148,094 10,933 — 155,957 Other income (expense): Equity in earnings (loss) of subsidiaries 165,624 8,203 — (173,827 ) — Equity in earnings of equity method investments — 10,965 — — 10,965 Interest expense (41,359 ) — — — (41,359 ) Interest income — 306 — — 306 Loss on early extinguishment of debt (12,225 ) — — — (12,225 ) Gain (loss) on sale of assets and other — 313 4 — 317 112,040 19,787 4 (173,827 ) (41,996 ) Income (loss) before income taxes 108,970 167,881 10,937 (173,827 ) 113,961 State income tax expense — (164 ) — — (164 ) Net income (loss) 108,970 167,717 10,937 (173,827 ) 113,797 Allocation of net income attributable to noncontrolling interests — (2,093 ) (2,734 ) — (4,827 ) Net income (loss) attributable to Holly Energy Partners 108,970 165,624 8,203 (173,827 ) 108,970 Other comprehensive income (loss) (91 ) (91 ) — 91 (91 ) Comprehensive income (loss) $ 108,879 $ 165,533 $ 8,203 $ (173,736 ) $ 108,879
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2018 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (58,326 ) $ 259,360 $ 25,722 $ (9,344 ) $ 217,412 Cash flows from investing activities Additions to properties and equipment — (28,057 ) (6,213 ) — (34,270 ) Business and asset acquisitions — (6,803 ) (38 ) — (6,841 ) Distributions from UNEV in excess of earnings — 7,156 — (7,156 ) — Proceeds from sale of assets — 210 — — 210 Distributions in excess of equity in earnings of equity investments — 1,368 — — 1,368 — (26,126 ) (6,251 ) (7,156 ) (39,533 ) Cash flows from financing activities Net repayments under credit agreement (91,000 ) — — — (91,000 ) Net intercompany financing activities 231,231 (231,231 ) — — — Proceeds from issuance of common units 114,839 48 — — 114,887 Contribution from general partner 614 — — — 614 Distributions to HEP unitholders (197,300 ) — — — (197,300 ) Distributions to noncontrolling interests — — (22,000 ) 16,500 (5,500 ) Units withheld for tax withholding obligations (58 ) — — — (58 ) Other — (923 ) — — (923 ) 58,326 (232,106 ) (22,000 ) 16,500 (179,280 ) Cash and cash equivalents Increase (decrease) for the period — 1,128 (2,529 ) — (1,401 ) Beginning of period 2 511 7,263 — 7,776 End of period $ 2 $ 1,639 $ 4,734 $ — $ 6,375 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2017 Parent Guarantor Restricted Subsidiaries Non-Guarantor Non-Restricted Subsidiaries Eliminations Consolidated (In thousands) Cash flows from operating activities $ (57,010 ) $ 215,608 $ 27,064 $ (8,203 ) $ 177,459 Cash flows from investing activities Additions to properties and equipment — (27,725 ) (2,950 ) — (30,675 ) Proceeds from sale of assets — 794 — — 794 Distributions from UNEV in excess of earnings — 6,797 — (6,797 ) — Distributions in excess of equity in earnings of equity investments — 1,224 — — 1,224 — (18,910 ) (2,950 ) (6,797 ) (28,657 ) Cash flows from financing activities Net borrowings under credit agreement 750,000 (553,000 ) — — 197,000 Net intercompany financing activities (357,196 ) 357,196 — — — Proceeds from issuance of 6% Senior Notes 103,250 (1,500 ) — — 101,750 Redemption of senior notes (309,750 ) — — — (309,750 ) Proceeds from issuance of common units 52,285 — — — 52,285 Distributions to HEP unitholders (171,560 ) — — — (171,560 ) Distributions to noncontrolling interests — — (20,000 ) 15,000 (5,000 ) Distribution to HFC for El Dorado tanks (103 ) — — — (103 ) Contributions from general partner 1,072 — — — 1,072 Units withheld for tax withholding obligations (35 ) — — — (35 ) Deferred financing costs (10,953 ) 1,500 — — (9,453 ) Other — (1,189 ) — — (1,189 ) 57,010 (196,993 ) (20,000 ) 15,000 (144,983 ) Cash and cash equivalents Decrease for the period — (295 ) 4,114 — 3,819 Beginning of period 2 301 3,354 — 3,657 End of period $ 2 $ 6 $ 7,468 $ — $ 7,476

Description of Business and P_3

Description of Business and Presentation of Financial Statements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 25, 2018	Oct. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Ownership Interests [Line Items]
Ownership percentage, controlling interest			57.00%		57.00%
General partner interest		2.00%
Common unit, issued (in shares)		37,250,000
Limited partner distribution		$ 2,500	$ 67,669	$ 63,012	$ 201,310	$ 143,326
Partners' capital account, units, sold in private placement (in shares)	3,700,000
Sale of stock, price per share (in dollars per share)	$ 29.73
Proceeds from issuance of private placement	$ 110,000
SLC Pipeline
Other Ownership Interests [Line Items]
Equity method investment, ownership percentage		75.00%
UNEV Pipeline
Other Ownership Interests [Line Items]
Equity method investment, ownership percentage			75.00%		75.00%
Frontier Pipeline
Other Ownership Interests [Line Items]
Equity method investment, ownership percentage		50.00%	50.00%		50.00%

Acquisitions - Narrative and Su

Acquisitions - Narrative and Summary of Acquired Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Oct. 31, 2017
Business Acquisition [Line Items]
Purchase price			$ 250,000
Step Acquisition, Equity Interest in Acquiree	$ 112,000
Step Acquisition - Remeasurement Gain	36,300
Consideration Transferred	$ 363,800
Working Capital Adjustment			1,800
Assets Acquired - Cash and Equivalents			4,609
Assets Acquired - Receivables			5,164
Assets Acquired - Prepaid and other Current Assets			8
Assets Acquired - Properties and Equipment			275,061
Assets Acquired - Intangible Assets			70,182
Goodwill			13,845
Liabilities Assumed - Accounts Payable			(3,598)
Liabilities Assumed - Accrued Property Taxes			(1,438)
Net Assets Acquired			$ 363,833
SLC Pipeline
Business Acquisition [Line Items]
Equity method investment, ownership percentage			75.00%
Frontier Pipeline
Business Acquisition [Line Items]
Equity method investment, ownership percentage		50.00%	50.00%

Revenues - Schedule of Cumulati

Revenues - Schedule of Cumulative Effect of Adjustment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue	$ 12,360	$ 8,278	$ 9,598
Partners’ equity: Common unitholders	$ 446,946	395,279	393,959
Prior to Adoption
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue			9,598
Partners’ equity: Common unitholders			$ 393,959
Increase (Decrease) \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue		(1,320)
Partners’ equity: Common unitholders		$ 1,320

Revenues - Narrative (Details)

Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenues - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Lease Income	$ 71,300		$ 209,800
Services revenue	125,784	$ 110,364	373,428	$ 325,142
Deferred revenue recognized	3,600		10,600
Deferred revenue recognized. billed prior period			2,600
Shortfall Payments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue	5,700		5,700
Service, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Services revenue	$ 54,500		$ 163,600

Revenues - Narrative, Remaining

Revenues - Narrative, Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2018USD ($)yr
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 94
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	352
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	305
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	294
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	267
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	1,041
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 2,353
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue service commitments expiration \| yr	2,036
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue service commitments expiration \| yr	2,019

Revenues - Schedule of Future P

Revenues - Schedule of Future Performance Obligations (Details) $ in Millions	Sep. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 94
Unfulfilled performance obligations, expected timing	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 352
Unfulfilled performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 305
Unfulfilled performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 294
Unfulfilled performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 267
Unfulfilled performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 2,353
Unfulfilled performance obligations, expected timing

Revenues - Schedule of Contract

Revenues - Schedule of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract asset	$ 1,673	$ 0
Contract liability	$ (5,726)	$ (2,713)

Revenues - Schedule of Disaggre

Revenues - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	$ 125,784	$ 110,364	$ 373,428	$ 325,142
Pipelines
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	69,735	54,072	207,443	161,768
Terminals, tanks and loading racks
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	36,469	35,701	109,036	105,864
Refinery processing units
Disaggregation of Revenue [Line Items]
Disaggregated Revenue	$ 19,580	$ 20,591	$ 56,949	$ 57,510

Financial Instruments - Narrati

Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Carrying Value
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 495,748	$ 495,308
Carrying Value \| 6% Senior notes
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	495,748	495,308
Fair Value \| Fair value inputs, Level 2
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	512,840	525,120
Fair Value \| 6% Senior notes \| Fair value inputs, Level 2
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 512,840	$ 525,120

Properties and Equipment - Sche

Properties and Equipment - Schedule of Properties and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$ 2,051,240	$ 2,023,232
Less accumulated depreciation	510,527	453,761
Properties and equipment, net	1,540,713	1,569,471
Pipelines, terminals and tankage
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	1,529,683	1,541,722
Refinery Assets
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	347,338	347,338
Land and right of way
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	85,961	86,484
Construction in progress
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	52,882	12,029
Other
Property, Plant and Equipment [Line Items]
Properties and equipment, gross	$ 35,376	$ 35,659

Properties and Equipment - Narr

Properties and Equipment - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Interest costs, capitalized during period	$ 211	$ 746
Depreciation expense	$ 62,600	$ 52,100

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 204,797	$ 204,396
Less accumulated amortization	85,966	74,933
Intangible assets, net	118,831	129,463
Delek transportation agreement
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 59,933	59,933
Useful Life	30 years
HFC transportation agreement
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 75,131	75,131
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 69,683	69,282
Useful Life	10 years
Other
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 50	$ 50
Minimum \| HFC transportation agreement
Finite-Lived Intangible Assets, Net [Abstract]
Useful Life	10 years
Maximum \| HFC transportation agreement
Finite-Lived Intangible Assets, Net [Abstract]
Useful Life	15 years

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 11	$ 5.2
Estimated amortization expense, remainder of fiscal year	14
Estimated amortization expense, 2019	3
Estimated amortization expense, 2020	14
Estimated amortization expense, 2021	14
Estimated amortization expense, 2022	14
Estimated amortization expense, 2023	$ 9.8

Employees, Retirement and Inc_3

Employees, Retirement and Incentive Plans Retirement and Benefit Plan Costs (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)shares	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Componentsshares	Sep. 30, 2017USD ($)
Share-based Compensation Arrangements
Employee benefits and share-based compensation \| $	$ 1.9	$ 1.5	$ 5.3	$ 4.5
Long-term Incentive Plan, Components \| Components			4
Number of incentive-based award plans	2		2
Compensation costs of incentive awards \| $	$ 0.7	$ 0	$ 2.1	$ 1.6
Deferred Bonus
Share-based Compensation Arrangements
Units authorized under equity-based compensation plans (new) \| shares	2,500,000		2,500,000
Number of units available for grant \| shares	1,323,371		1,323,371

Employees, Retirement and Inc_4

Employees, Retirement and Incentive Plans Restricted Units (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Restricted and Phantom Units
Share-based Compensation Arrangements
Nonvested restricted units outstanding	130,235	119,009
Weighted average grant date fair value	$ 34.33	$ 34.77
Granted	12,890
Weighted Average Grant Date Fair Value	$ 30.23
Total unrecognized compensation related to nonvested units	$ 1.3
Weighted average remaining contractual term (years)	1 year
Forfeitures	(1,664)
Weighted Average Grant Date Fair Value - Forfeitures	$ 34.64
Performance Shares [Member]
Share-based Compensation Arrangements
Nonvested restricted units outstanding	35,392	36,911
Granted	2,764
Total unrecognized compensation related to nonvested units	$ 0.5
Weighted average remaining contractual term (years)	1 year 1 month
Maximum \| Restricted Stock [Member]
Share-based Compensation Arrangements
Award Vesting Period	3 years

Employees, Retirement and Inc_5

Employees, Retirement and Incentive Plans Performance Units (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)shares
Share-based Compensation Arrangement Instruments [Roll Forward]
Weighted Average Fair Value of Units Outstanding \| $	$ 1.2
Performance Shares [Member]
Share-based Compensation Arrangements
Estimated Share Payouts Unit Awards Minimum	100.00%
Estimated Share Payouts Unit Awards Maximum	150.00%
Share-based Compensation Arrangement Instruments [Roll Forward]
Outstanding at January 1, 2018 (nonvested)	36,911
Granted	2,764
Vesting and transfer of common units to recipients	(4,283)
Outstanding at September 30, 2018 (nonvested)	35,392
Fair value of vested units transferred to recipients \| $	$ (0.1)
Total unrecognized compensation related to nonvested units \| $	$ 0.5
Weighted average remaining contractual term (years)	1 year 1 month
Restricted and Phantom Units
Share-based Compensation Arrangement Instruments [Roll Forward]
Outstanding at January 1, 2018 (nonvested)	119,009
Granted	12,890
Outstanding at September 30, 2018 (nonvested)	130,235
Total unrecognized compensation related to nonvested units \| $	$ 1.3
Weighted average remaining contractual term (years)	1 year
Executive Officer [Member] \| Performance Shares [Member]
Share-based Compensation Arrangements
Estimated Share Payouts Unit Awards Minimum	50.00%
Estimated Share Payouts Unit Awards Maximum	150.00%

Debt - Senior Notes (Details)

Debt - Senior Notes (Details) - USD ($) $ in Thousands	Jan. 04, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Sep. 22, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,400,000		$ 1,400,000
Line of Credit Facility, Expiration Date		Jul. 1, 2022
Line of Credit Facility, Capacity Available for Trade Purchases		$ 50,000		50,000
Line of Credit Facility, Accordion Feature		300,000		300,000
Senior Notes							$ 100,000
Loss on early extinguishment of debt		$ 0	$ 0	$ 0	$ (12,225)
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal	$ 300,000
Stated interest rate, senior notes	6.50%	6.00%		6.00%
Senior Notes Aggregate Redemption Amount	$ 309,800
Loss on early extinguishment of debt	12,200
Unamortized Premium	9,800
Unamortized Discount	$ 2,400
6% Senior notes
Debt Instrument [Line Items]
Principal		$ 500,000		$ 500,000		$ 500,000		$ 400,000
Senior Notes						$ 495,308
Stated interest rate, senior notes		6.00%		6.00%

Debt Long-Term Debt (Details)

Debt Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 22, 2017	Jan. 04, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Credit Agreement	$ 921,000	$ 1,012,000
Senior Notes			$ 100,000
Total long-term debt	1,416,748	1,507,308
6% Senior notes
Debt Instrument [Line Items]
Principal	500,000	500,000			$ 400,000
Unamortized discount	$ (4,252)	(4,692)
Senior Notes		$ 495,308
6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Principal				$ 300,000

Debt - Interest Rate Risk Manag

Debt - Interest Rate Risk Management (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 921,000	$ 1,012,000
London Interbank Offered Rate (LIBOR) [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 150,000

Debt - Interest Expense and Oth

Debt - Interest Expense and Other Debt Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Interest expense, debt			$ 53,460	$ 42,105
Less capitalized interest			211	746
Interest expense	$ 18,042	$ 14,072	53,249	41,359
Cash paid for interest			58,697	53,181
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense, debt			27,233	20,338
Senior Notes [Member] \| 6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense, debt			0	163
Senior Notes [Member] \| 6% Senior notes
Debt Instrument [Line Items]
Interest expense, debt			22,500	18,150
Amortization discount and deferred debt issuance costs [Member]
Debt Instrument [Line Items]
Interest expense, debt			2,277	2,317
Commitment Fees and Other [Member]
Debt Instrument [Line Items]
Interest expense, debt			$ 1,450	$ 1,137

Debt Debt - Capital Leases (Det

Debt Debt - Capital Leases (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Capital Leased Assets [Line Items]
Capital Leased Assets, Gross	$ 5.8	$ 5.1
Capital Leases Accumulated Depreciation	$ 4	$ 3.3
Minimum
Capital Leased Assets [Line Items]
Capital Leases, Term of Contract	33 months
Maximum
Capital Leased Assets [Line Items]
Capital Leases, Term of Contract	48 months

Significant Customers - Narrati

Significant Customers - Narrative and Schedule of Percentage of Total Revenues By Customer (Details) - Sales Revenue, Net - Customers	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Major Customer [Line Items]
Concentration risk, percentage of total sales			86.00%
Concentration risk, number of significant customers			2
HFC
Revenue, Major Customer [Line Items]
Concentration risk, percentage of total sales	80.00%	86.00%	79.00%	85.00%
Delek
Revenue, Major Customer [Line Items]
Concentration risk, percentage of total sales	6.00%	7.00%	6.00%	7.00%

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 31, 2017USD ($)shares	Sep. 30, 2018USD ($)yr	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)yr	Sep. 30, 2017USD ($)
Related Party Transaction [Line Items]
Administrative fee, related party					$ 2,500
Revenue from related parties		$ 100,188		$ 95,138	295,629	$ 277,316
Omnibus Agreement G & A expenses, related party		600			1,900	1,800
Employee expenses reimbursed to related party		13,100		11,700	38,300	34,500
Reimbursements received from related parties		2,800		1,900	6,900	4,700
Accounts receivable due from HFC		47,100	$ 51,500		47,100
Due to Affiliate		6,400			6,400
Accounts payable to HFC		6,414	7,725		6,414
Lease Income		500		100	1,500	300
General partner interest	2.00%
Common unit, issued (in shares) \| shares	37,250,000
Limited partner distribution	$ 2,500	67,669		63,012	201,310	143,326
Affiliated Entity
Related Party Transaction [Line Items]
Minimum annualized payments		335,000			335,000
Distributions to HEP unitholders		$ 36,900		$ 32,800	109,700	$ 94,800
Shortfall Payments
Related Party Transaction [Line Items]
Shortfall billings deferred revenue			$ 4,400		$ 2,000
Minimum
Related Party Transaction [Line Items]
Revenue service commitments expiration \| yr		2,019			2,019
Maximum
Related Party Transaction [Line Items]
Revenue service commitments expiration \| yr		2,036			2,036

Partners' Equity, Income Allo_3

Partners' Equity, Income Allocations and Cash Distributions - Issuances (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 25, 2018	Sep. 30, 2018	Jun. 30, 2018
Partners' Capital [Abstract]
Common units held by HFC (in shares)		59,630,030
Ownership percentage, controlling interest		57.00%
Partners' capital account, units, sold in private placement (in shares)	3,700,000
Sale of stock, price per share (in dollars per share)	$ 29.73
Proceeds from issuance of private placement	$ 110
Common Unit Issuance Program		$ 200
Partners' capital account, units, sale of units (in shares)		171,246	2,413,153
Gross proceeds from issuance of common units		$ 5.2	$ 82.3

Partners' Equity, Income Allo_4

Partners' Equity, Income Allocations and Cash Distributions - Allocations of Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Partners' Capital [Abstract]
General partner interest in net income	$ 0	$ (419)	$ 0	$ (919)
General partner incentive distribution	0	0	0	34,128
Total general partner interest in net income	$ 0	$ (419)	$ 0	$ 35,047

Partners' Equity, Income Allo_5

Partners' Equity, Income Allocations and Cash Distributions - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 08, 2018	Oct. 29, 2018	Oct. 19, 2018	Oct. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distribution Payments [Line Items]
Limited partner distribution				$ 2,500	$ 67,669	$ 63,012	$ 201,310	$ 143,326
Partner Distributions
General partner interest in distribution					0	0	0	2,335
General partner incentive distribution					0	0	0	34,128
Total general partner distribution					0	0	0	36,463
Limited partner distribution				$ 2,500	67,669	63,012	201,310	143,326
Total regular quarterly cash distributions					$ 67,669	$ 63,012	$ 201,310	$ 179,789
Cash distribution per unit applicable to limited partners (in dollars per share)					$ 0.6650	$ 0.6450	$ 1.9800	$ 1.8975
Subsequent Event
Distribution Payments [Line Items]
Dividends payable, date declared			Oct. 19, 2018
Partners' capital, distribution amount per share (in dollars per share)			$ 0.665
Dividends payable, date to be paid	Nov. 8, 2018
Dividends payable, date of record		Oct. 29, 2018
Limited partner distribution	$ 2,500
Partner Distributions
Limited partner distribution	$ 2,500

Net Income per Limited Partne_3

Net Income per Limited Partner Unit - Schedules of Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings per Unit by Type of Partner [Line Items]
Net income attributable to the partners		$ 45,003	$ 42,071	$ 131,314	$ 108,970
General Partners' Distribution Declared		0	0	0	(36,463)
Limited partner distribution declared	$ 2,500	67,669	63,012	201,310	143,326
Distributions in excess of net income attributable to the partners		(22,666)	(20,941)	(69,996)	(70,819)
Net income attributable to partnership		45,003	42,071	131,314	108,970
Total partner interest in net income		$ 67,669	$ 63,012	$ 201,310	$ 179,789
Weighted average limited partners’ units outstanding		105,440	64,319	104,908	63,845
Limited partners’ per unit interest in earnings—basic and diluted:		$ 0.43	$ 0.66	$ 1.25	$ 1.16
General Partner
Earnings per Unit by Type of Partner [Line Items]
Distributions in excess of net income attributable to the partners		$ 0	$ (419)	$ 0	$ (1,416)
Net income attributable to partnership		0	(419)	0	35,047
Limited Partner
Earnings per Unit by Type of Partner [Line Items]
Distributions in excess of net income attributable to the partners		(22,666)	(20,522)	(69,996)	(69,403)
Net income attributable to partnership		$ 45,003	$ 42,490	$ 131,314	$ 73,923

Environmental Environmental (De

Environmental Environmental (Details) - USD ($)	3 Months Ended		9 Months Ended
Environmental Environmental (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Environmental remediation expense	$ 100,000	$ 0	$ 400,000	$ 0
Accrued environmental expense	6,100,000		6,100,000		$ 6,500,000
Accrued environmental expense, noncurrent	4,300,000		4,300,000		5,000,000
Affiliated Entity
Loss Contingencies [Line Items]
Accrued environmental expense	$ 600,000		$ 600,000		$ 800,000

Operating Segments - Schedule o

Operating Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues		$ 25,596	$ 15,226	$ 77,799	$ 47,826
Revenue from Contract with Customer, Excluding Assessed Tax		125,784	110,364	373,428	325,142
Operating Income (Loss)		62,923	51,736	184,287	155,957
Segment operating profit		65,421	55,359	192,580	164,829
Unallocated general and administrative		(2,498)	(3,623)	(8,293)	(8,872)
Interest and financing costs, net		(17,502)	(13,971)	(51,668)	(53,278)
Equity in earnings of unconsolidated affiliates		1,114	5,072	4,127	10,965
Gain (loss) on sale of assets and other		38	155	71	317
Income before income taxes		46,573	42,992	136,817	113,961
Capital Expenditures		9,531	10,151	34,270	30,675
Assets		2,107,042		2,107,042		$ 2,154,114
Goodwill		270,336		270,336		266,716
Pipelines and terminal - affiliate
Segment Reporting Information [Line Items]
Revenues		80,608	74,547	238,680	219,806
Pipelines and terminals - third party
Segment Reporting Information [Line Items]
Revenues		25,596	15,226	77,799	47,826
Operating Income (Loss)		56,531	44,896	167,748	140,546
Capital Expenditures		9,389	10,151	34,128	30,437
Assets	[1]	1,692,679		1,692,679		1,728,074
Refinery processing units
Segment Reporting Information [Line Items]
Revenues		19,580	20,591	56,949	57,510
Revenue from Contract with Customer, Excluding Assessed Tax		19,580	20,591	56,949	57,510
Operating Income (Loss)		8,890	10,463	24,832	24,283
Capital Expenditures		142	$ 0	142	$ 238
Assets		317,919		317,919		328,585
Other
Segment Reporting Information [Line Items]
Assets		$ 96,444		$ 96,444		$ 97,455

[1]	Includes goodwill of $270.3 million and $266.7 million as of September 30, 2018 and December 31, 2017, respectively.

Supplemental Guarantor _ Non-_3

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 6,375		$ 7,776	$ 7,476	$ 3,657
Accounts receivable	57,410		64,304
Prepaid and other current assets	2,713		2,311
Total current assets	66,498		74,391
Properties and equipment, net	1,540,713		1,569,471
Investment in subsidiaries	0		0
Intangible assets, net	118,831		129,463
Goodwill	270,336		266,716
Equity method investments	83,911		85,279
Other assets	26,753		28,794
Assets	2,107,042		2,154,114
Current liabilities:
Accounts payable	16,402		22,272
Accrued interest	5,730		13,256
Deferred revenue	12,360	$ 8,278	9,598
Accrued property taxes	7,398		4,652
Other current liabilities	3,694		5,707
Total current liabilities	45,584		55,485
Long-term debt	1,416,748		1,507,308
Other long-term liabilities	15,255		15,843
Deferred revenue	48,408		47,272
Class B unit	45,380		43,141
Equity - partners	446,946		393,959
Equity - noncontrolling interest	88,721		91,106
Total liabilities and equity	2,107,042		2,154,114
Parent
Current assets:
Cash and cash equivalents	2		2	2	2
Accounts receivable	0		0
Prepaid and other current assets	85		13
Total current assets	87		15
Properties and equipment, net	0		0
Investment in subsidiaries	1,859,722		1,902,285
Intangible assets, net	0		0
Goodwill	0		0
Equity method investments	0		0
Other assets	9,897		11,753
Assets	1,869,706		1,914,053
Current liabilities:
Accounts payable	0		0
Accrued interest	5,730		12,500
Deferred revenue	0		0
Accrued property taxes	0		0
Other current liabilities	22		0
Total current liabilities	5,752		12,500
Long-term debt	1,416,748		1,507,308
Other long-term liabilities	260		286
Deferred revenue	0		0
Class B unit	0		0
Equity - partners	446,946		393,959
Equity - noncontrolling interest	0		0
Total liabilities and equity	1,869,706		1,914,053
Guarantor Restricted Subsidiaries
Current assets:
Cash and cash equivalents	1,639		511	6	301
Accounts receivable	52,218		59,448
Prepaid and other current assets	2,253		2,016
Total current assets	56,110		61,975
Properties and equipment, net	1,190,867		1,213,626
Investment in subsidiaries	266,162		273,319
Intangible assets, net	118,831		129,463
Goodwill	270,336		266,716
Equity method investments	83,911		85,279
Other assets	16,856		17,041
Assets	2,003,073		2,047,419
Current liabilities:
Accounts payable	15,574		20,928
Accrued interest	0		756
Deferred revenue	11,228		8,540
Accrued property taxes	4,346		3,431
Other current liabilities	3,670		5,707
Total current liabilities	34,818		39,362
Long-term debt	0		0
Other long-term liabilities	14,745		15,359
Deferred revenue	48,408		47,272
Class B unit	45,380		43,141
Equity - partners	1,859,722		1,902,285
Equity - noncontrolling interest	0		0
Total liabilities and equity	2,003,073		2,047,419
Non-Guarantor Non-Restricted Subsidiaries
Current assets:
Cash and cash equivalents	4,734		7,263	7,468	3,354
Accounts receivable	5,438		5,038
Prepaid and other current assets	375		282
Total current assets	10,547		12,583
Properties and equipment, net	349,846		355,845
Investment in subsidiaries	0		0
Intangible assets, net	0		0
Goodwill	0		0
Equity method investments	0		0
Other assets	0		0
Assets	360,393		368,428
Current liabilities:
Accounts payable	1,074		1,526
Accrued interest	0		0
Deferred revenue	1,132		1,058
Accrued property taxes	3,052		1,221
Other current liabilities	2		0
Total current liabilities	5,260		3,805
Long-term debt	0		0
Other long-term liabilities	250		198
Deferred revenue	0		0
Class B unit	0		0
Equity - partners	266,162		273,319
Equity - noncontrolling interest	88,721		91,106
Total liabilities and equity	360,393		368,428
Eliminations
Current assets:
Cash and cash equivalents	0		0	$ 0	$ 0
Accounts receivable	(246)		(182)
Prepaid and other current assets	0		0
Total current assets	(246)		(182)
Properties and equipment, net	0		0
Investment in subsidiaries	(2,125,884)		(2,175,604)
Intangible assets, net	0		0
Goodwill	0		0
Equity method investments	0		0
Other assets	0		0
Assets	(2,126,130)		(2,175,786)
Current liabilities:
Accounts payable	(246)		(182)
Accrued interest	0		0
Deferred revenue	0		0
Accrued property taxes	0		0
Other current liabilities	0		0
Total current liabilities	(246)		(182)
Long-term debt	0		0
Other long-term liabilities	0		0
Deferred revenue	0		0
Class B unit	0		0
Equity - partners	(2,125,884)		(2,175,604)
Equity - noncontrolling interest	0		0
Total liabilities and equity	$ (2,126,130)		$ (2,175,786)

Supplemental Guarantor _ Non-_4

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Affiliates	$ 100,188	$ 95,138	$ 295,629	$ 277,316
Revenues	25,596	15,226	77,799	47,826
Revenue from Contract with Customer, Excluding Assessed Tax	125,784	110,364	373,428	325,142
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	35,996	35,998	106,731	102,584
Depreciation and amortization	24,367	19,007	74,117	57,729
General and administrative	2,498	3,623	8,293	8,872
Total operating costs and expenses	62,861	58,628	189,141	169,185
Operating Income (Loss)	62,923	51,736	184,287	155,957
Equity in earnings of subsidiaries	0	0	0	0
Equity in earnings of equity method investments	1,114	5,072	4,127	10,965
Interest expense	(18,042)	(14,072)	(53,249)	(41,359)
Interest income	540	101	1,581	306
Loss on early extinguishment of debt	0	0	0	(12,225)
Gain on sale of assets and other	38	155	71	317
Nonoperating Income (Expense)	(16,350)	(8,744)	(47,470)	(41,996)
Income before income taxes	46,573	42,992	136,817	113,961
State income tax benefit (expense)	(39)	69	(149)	(164)
Net income	46,534	43,061	136,668	113,797
Allocation of net income attributable to noncontrolling interests	(1,531)	(990)	(5,354)	(4,827)
Net income attributable to the partners	45,003	42,071	131,314	108,970
Other comprehensive income	0	(63)	0	(91)
Comprehensive income attributable to the partners	45,003	42,008	131,314	108,879
Parent
Revenues:
Affiliates	0	0	0	0
Revenues	0	0	0	0
Revenue from Contract with Customer, Excluding Assessed Tax	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	698	1,050	2,739	3,070
Total operating costs and expenses	698	1,050	2,739	3,070
Operating Income (Loss)	(698)	(1,050)	(2,739)	(3,070)
Equity in earnings of subsidiaries	63,731	57,193	187,349	165,624
Equity in earnings of equity method investments	0	0	0	0
Interest expense	(18,030)	(14,072)	(53,341)	(41,359)
Interest income	0	0	0	0
Loss on early extinguishment of debt				(12,225)
Gain on sale of assets and other	0	0	45	0
Nonoperating Income (Expense)	45,701	43,121	134,053	112,040
Income before income taxes	45,003	42,071	131,314	108,970
State income tax benefit (expense)	0	0	0	0
Net income	45,003	42,071	131,314	108,970
Allocation of net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to the partners	45,003	42,071	131,314	108,970
Other comprehensive income	0	(63)	0	(91)
Comprehensive income attributable to the partners	45,003	42,008	131,314	108,879
Guarantor Restricted Subsidiaries
Revenues:
Affiliates	94,270	89,772	278,083	258,571
Revenues	21,277	10,758	60,795	32,146
Revenue from Contract with Customer, Excluding Assessed Tax	115,547	100,530	338,878	290,717
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	32,906	31,360	97,064	91,323
Depreciation and amortization	20,198	14,854	61,630	45,498
General and administrative	1,800	2,573	5,554	5,802
Total operating costs and expenses	54,904	48,787	164,248	142,623
Operating Income (Loss)	60,643	51,743	174,630	148,094
Equity in earnings of subsidiaries	2,251	783	9,344	8,203
Equity in earnings of equity method investments	1,114	5,072	4,127	10,965
Interest expense	(12)	0	92	0
Interest income	540	101	1,581	306
Loss on early extinguishment of debt				0
Gain on sale of assets and other	14	154	(37)	313
Nonoperating Income (Expense)	3,907	6,110	15,107	19,787
Income before income taxes	64,550	57,853	189,737	167,881
State income tax benefit (expense)	(39)	69	(149)	(164)
Net income	64,511	57,922	189,588	167,717
Allocation of net income attributable to noncontrolling interests	(780)	(729)	(2,239)	(2,093)
Net income attributable to the partners	63,731	57,193	187,349	165,624
Other comprehensive income	0	(63)	0	(91)
Comprehensive income attributable to the partners	63,731	57,130	187,349	165,533
Non-Guarantor Non-Restricted Subsidiaries
Revenues:
Affiliates	5,918	5,366	17,546	18,745
Revenues	4,319	4,468	17,004	15,680
Revenue from Contract with Customer, Excluding Assessed Tax	10,237	9,834	34,550	34,425
Operating costs and expenses [Abstract]
Operations (exclusive of depreciation and amortization)	3,090	4,638	9,667	11,261
Depreciation and amortization	4,169	4,153	12,487	12,231
General and administrative	0	0	0	0
Total operating costs and expenses	7,259	8,791	22,154	23,492
Operating Income (Loss)	2,978	1,043	12,396	10,933
Equity in earnings of subsidiaries	0	0	0	0
Equity in earnings of equity method investments	0	0	0	0
Interest expense	0	0	0	0
Interest income	0	0	0	0
Loss on early extinguishment of debt				0
Gain on sale of assets and other	24	1	63	4
Nonoperating Income (Expense)	24	1	63	4
Income before income taxes	3,002	1,044	12,459	10,937
State income tax benefit (expense)	0	0	0	0
Net income	3,002	1,044	12,459	10,937
Allocation of net income attributable to noncontrolling interests	(751)	(261)	(3,115)	(2,734)
Net income attributable to the partners	2,251	783	9,344	8,203
Other comprehensive income	0	0	0	0
Comprehensive income attributable to the partners	2,251	783	9,344	8,203
Eliminations
Revenues:
Affiliates	0	0	0	0
Revenues	0	0	0	0
Revenue from Contract with Customer, Excluding Assessed Tax	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	0
General and administrative	0	0	0	0
Total operating costs and expenses	0	0	0	0
Operating Income (Loss)	0	0	0	0
Equity in earnings of subsidiaries	(65,982)	(57,976)	(196,693)	(173,827)
Equity in earnings of equity method investments	0	0	0	0
Interest expense	0	0	0	0
Interest income	0	0	0	0
Loss on early extinguishment of debt				0
Gain on sale of assets and other	0	0	0	0
Nonoperating Income (Expense)	(65,982)	(57,976)	(196,693)	(173,827)
Income before income taxes	(65,982)	(57,976)	(196,693)	(173,827)
State income tax benefit (expense)	0	0	0	0
Net income	(65,982)	(57,976)	(196,693)	(173,827)
Allocation of net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to the partners	(65,982)	(57,976)	(196,693)	(173,827)
Other comprehensive income	0	63	0	91
Comprehensive income attributable to the partners	$ (65,982)	$ (57,913)	$ (196,693)	$ (173,736)

Supplemental Guarantor _ Non-_5

Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 217,412	$ 177,459
Cash flows from investing activities
Additions to properties and equipment	(34,270)	(30,675)
Other Payments to Acquire Businesses	(6,841)	0
Proceeds from sale of assets	210	794
Distributions from UNEV in excess of earnings	0	0
Distributions in excess of equity in earnings of equity investments	1,368	1,224
Net cash provided by (used for) investing activities	(39,533)	(28,657)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	(91,000)	197,000
Net intercompany financing activities	0	0
Proceeds from issuance of Senior Notes	0	101,750
Proceeds from Issuance of common units	114,887	52,285
Redemption of 6.5% Senior Notes	0	(309,750)
Distributions to HEP unitholders	(197,300)	(171,560)
Contributions from general partner	614	1,072
Distribution to HFC for El Dorado tanks		(103)
Distributions to noncontrolling interests	(5,500)	(5,000)
Units withheld for tax withholding obligations	(58)	(35)
Deferred financing costs		(9,453)
Other	(923)	(1,189)
Net cash provided by (used by) financing activities	(179,280)	(144,983)
Increase (decrease) for the period	(1,401)	3,819
Beginning of period	7,776	3,657
End of period	6,375	7,476
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(58,326)	(57,010)
Cash flows from investing activities
Additions to properties and equipment	0	0
Other Payments to Acquire Businesses	0
Proceeds from sale of assets	0	0
Distributions from UNEV in excess of earnings	0	0
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	0	0
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	(91,000)	750,000
Net intercompany financing activities	231,231	(357,196)
Proceeds from issuance of Senior Notes		103,250
Proceeds from Issuance of common units	114,839	52,285
Redemption of 6.5% Senior Notes		(309,750)
Distributions to HEP unitholders	(197,300)	(171,560)
Contributions from general partner	614	1,072
Distribution to HFC for El Dorado tanks		(103)
Distributions to noncontrolling interests	0	0
Units withheld for tax withholding obligations	(58)	(35)
Deferred financing costs		(10,953)
Other	0	0
Net cash provided by (used by) financing activities	58,326	57,010
Increase (decrease) for the period	0	0
Beginning of period	2	2
End of period	2	2
Guarantor Restricted Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	259,360	215,608
Cash flows from investing activities
Additions to properties and equipment	(28,057)	(27,725)
Other Payments to Acquire Businesses	(6,803)
Proceeds from sale of assets	210	794
Distributions from UNEV in excess of earnings	7,156	6,797
Distributions in excess of equity in earnings of equity investments	1,368	1,224
Net cash provided by (used for) investing activities	(26,126)	(18,910)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	(553,000)
Net intercompany financing activities	(231,231)	357,196
Proceeds from issuance of Senior Notes		1,500
Proceeds from Issuance of common units	48	0
Redemption of 6.5% Senior Notes		0
Distributions to HEP unitholders	0	0
Contributions from general partner	0	0
Distribution to HFC for El Dorado tanks		0
Distributions to noncontrolling interests	0	0
Units withheld for tax withholding obligations	0	0
Deferred financing costs		1,500
Other	(923)	(1,189)
Net cash provided by (used by) financing activities	(232,106)	(196,993)
Increase (decrease) for the period	1,128	(295)
Beginning of period	511	301
End of period	1,639	6
Non-Guarantor Non-Restricted Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	25,722	27,064
Cash flows from investing activities
Additions to properties and equipment	(6,213)	(2,950)
Other Payments to Acquire Businesses	(38)
Proceeds from sale of assets	0	0
Distributions from UNEV in excess of earnings	0	0
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	(6,251)	(2,950)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	0
Net intercompany financing activities	0	0
Proceeds from issuance of Senior Notes		0
Proceeds from Issuance of common units	0	0
Redemption of 6.5% Senior Notes		0
Distributions to HEP unitholders	0	0
Contributions from general partner	0	0
Distribution to HFC for El Dorado tanks		0
Distributions to noncontrolling interests	(22,000)	(20,000)
Units withheld for tax withholding obligations	0	0
Deferred financing costs		0
Other	0	0
Net cash provided by (used by) financing activities	(22,000)	(20,000)
Increase (decrease) for the period	(2,529)	4,114
Beginning of period	7,263	3,354
End of period	4,734	7,468
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(9,344)	(8,203)
Cash flows from investing activities
Additions to properties and equipment	0	0
Other Payments to Acquire Businesses	0
Proceeds from sale of assets	0	0
Distributions from UNEV in excess of earnings	(7,156)	(6,797)
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	(7,156)	(6,797)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	0
Net intercompany financing activities	0	0
Proceeds from issuance of Senior Notes		0
Proceeds from Issuance of common units	0	0
Redemption of 6.5% Senior Notes		0
Distributions to HEP unitholders	0	0
Contributions from general partner	0	0
Distribution to HFC for El Dorado tanks		0
Distributions to noncontrolling interests	16,500	15,000
Units withheld for tax withholding obligations	0	0
Deferred financing costs		0
Other	0	0
Net cash provided by (used by) financing activities	16,500	15,000
Increase (decrease) for the period	0	0
Beginning of period	0	0
End of period	$ 0	$ 0