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Commitments and Contingencies Letters of Credit (Details) (Letter of Credit [Member], Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Letter of Credit [Member] | Revolving Credit Facility [Member] | Fifth Third Bank [Member] |
Debt Instrument [Line Items] |
Letters of Credit Outstanding | $ 4.5 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Line of Credit Facility, Amount Outstanding | $ 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant