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Commitments and Contingencies Contracts and Agreements (Details) | 9 Months Ended
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Sep. 30, 2015 bbl / pure
Abilene Contract [Member] | Inventories [Member] |
Other Commitments [Line Items] |
Maximum Purchases under Supply Contract (bpd) | 20,350

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- Definition Maximum Purchases under Supply Contract + References No definition available. + Details
Name: | dkl_MaximumPurchasesUnderSupplyContract
Namespace Prefix: | dkl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=dkl_AbileneContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_InventoriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |