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Commitments and Contingencies Contracts and Agreements (Details) (Abilene Contract [Member])	9 Months Ended
	Sep. 30, 2014
Abilene Contract [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:	dk_MaximumPurchasesUnderSupplyContract
Namespace Prefix:	dk_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration