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Related Party Transactions Omnibus Agreement (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 26, 2013 | Nov. 07, 2012 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |
Indemnification Deductible |  |  | $ 0.9
Omnibus Agreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Omnibus Agreement Annual Amount | 3.0 | 2.7 |
Payment for Management Fee |  |  | 3.7
Annual Maximum Tank Repair and Maintenance Expense |  | 0.5 |
Maximum Non-Discretionary Maintenance Capital Expenditures | 1.4 | 0.4 |
Omnibus Agreement [Member] | General and administrative services [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payment for Management Fee |  |  | 2.8
Omnibus Agreement [Member] | Insurance coverage [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payment for Management Fee |  |  | $ 0.9

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- 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 Indemnification Deductible + References No definition available. + Details
Name: | dk_IndemnificationDeductible
Namespace Prefix: | dk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum Non-Discretionary Maintenance Capital Expenditures + References No definition available. + Details
Name: | dk_MaximumNonDiscretionaryMaintenanceCapitalExpenditures
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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- Definition Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_PaymentForManagementFee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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