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Related Party Transactions Omnibus Agreement (Details) (Omnibus Agreement [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
--- | ---
Feb. 10, 2014 | Jul. 26, 2013
Related Party Transaction [Line Items] |  |
Omnibus Agreement Annual Amount | $ 3.3 | $ 3.0
El Dorado Terminal and Tanks [Member] |  |
Related Party Transaction [Line Items] |  |
Annual Maximum Tank Repair and Maintenance Expense | $ 0.5 |

X
- Definition Annual Maximum Tank Repair and Maintenance Expense + References No definition available. + Details
Name: | dk_AnnualMaximumTankRepairAndMaintenanceExpense
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Omnibus Agreement Annual Amount + References No definition available. + Details
Name: | dk_OmnibusAgreementAnnualAmount
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration