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Commitments and Contingencies Contracts and Agreements (Details) (Abilene Contract [Member]) | 9 Months Ended
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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