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Related Party Transactions - Summary of Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Revenues | [1] | $ 123,519 | $ 95,410 | $ 308,435 | $ 289,739
Delek US and affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenues |  | 123,519 | 95,410 | 308,435 | 289,739
General and administrative expenses |  | 2,681 | 3,250 | 6,794 | 9,322
Purchases from Affiliates | Delek US and affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchases from Affiliates |  | 89,852 | 45,186 | 229,810 | 155,679
Operating and maintenance expense | Delek US and affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Operating and maintenance expenses |  | $ 10,656 | $ 10,330 | $ 30,217 | $ 33,397
[1] | See Note 3 for a description of our material affiliate revenue transactions.

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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