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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
Letter of Credit [Member] | Revolving Credit Facility [Member] | Fifth Third Bank [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding	$ 4.5us-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	$ 0us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = dkl_FifthThirdBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember

X

- Details

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

X

- 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