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Related Party Transactions Commercial Agreements in Connection with Tyler Acquisition (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 26, 2013 | Sep. 30, 2013 | Sep. 30, 2013
Tyler Terminal Throughput and Tankage Agreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Minimum Throughput Commitment | 50,000 |  |
Throughput Commitment Tariff Rate | 0.35 |  |
Minimum Monthly Storage Fee Revenue, Amount | $ 841,667 |  |
Term Of Agreement | 8 years 0 months 0 days |  |
Related Party Transaction, Other Revenues from Transactions with Related Party |  | 3,300,000 | 3,300,000
Tyler Lease and Access Agreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Term Of Agreement | 50 years 0 months 0 days |  |
Related party transaction, annual lease payment | 100.00 |  |
Tyler Site Services Agreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Annual Service Fee | $ 200,000 |  |

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- Definition Minimum Monthly Storage Fee Revenue, Amount + References No definition available. + Details
Name: | dk_MinimumMonthlyStorageFeeRevenueAmount
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum Throughput Commitment + References No definition available. + Details
Name: | dk_MinimumThroughputCommitment
Namespace Prefix: | dk_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Annual Service Fee + References No definition available. + Details
Name: | dk_RelatedPartyAnnualServiceFee
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The yearly payments due under the lease entered into in with related party. + References No definition available. + Details
Name: | dk_Relatedpartytransactionannualleasepayment
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The term of the agreement. Agreement could be a lease, debt, arrangement, services agreement or other arrangement. + References No definition available. + Details
Name: | dk_TermOfAgreement
Namespace Prefix: | dk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Throughput Commitment Tariff Rate + References No definition available. + Details
Name: | dk_ThroughputCommitmentTariffRate
Namespace Prefix: | dk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
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

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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration