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v2.4.1.9

Amended and Restated Credit Agreement (Details) (Revolving Credit Facility [Member], Fifth Third Bank [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 30, 2014 | Jul. 09, 2013
Letter of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowings outstanding | $ 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |  |
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 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum Borrowing Capacity |  | 700.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 400.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Maximum Borrowing Capacity under Accordion Feature |  | 800.0 dkl_MaximumBorrowingCapacityUnderAccordionFeature / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |
Weighted Average Interest Rate | 2.60%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Unused Capacity, Commitment Fee Percentage | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Holdings Note Principal amount outstanding | 102.0 dkl_RelatedPartyLimiitedGuarantyofDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Borrowings outstanding | 316.4 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Remaining Borrowing Capacity | $ 379.1 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | United States of America, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR |
Line of Credit [Member] | Canadian prime rate [Member] | Canada, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | Canadian dollar prime rate, |
Line of Credit [Member] | Prime Rate [Member] | United States of America, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | U.S. dollar prime rate |
Line of Credit [Member] | Canadian Dealer Offered Rate (CDOR) [Member] | Canada, Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | Canadian Dealer Offered Rate |

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- Definition Maximum Borrowing Capacity under Accordion Feature + References No definition available. + Details
Name: | dkl_MaximumBorrowingCapacityUnderAccordionFeature
Namespace Prefix: | dkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Related Party Limiited Guaranty of Debt + References No definition available. + Details
Name: | dkl_RelatedPartyLimiitedGuarantyofDebt
Namespace Prefix: | dkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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

X
- 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

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |