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Commitments and Contingencies Contracts and Agreements (Details)	9 Months Ended
	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

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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: