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Subsequent Events Amended Credit Facility (Details) (USD $) In Millions, unless otherwise specified | Jul. 09, 2013 | Nov. 07, 2012
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Line of Credit [Member] |  |
Subsequent Event [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 175.0
Maximum Borrowing Capacity under Accordion Feature |  | 225.0
Revolving Credit Facility, Swing Line Loan [Member] |  |
Subsequent Event [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 7.0
Letter of Credit [Member] |  |
Subsequent Event [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 50.0
Subsequent Event [Member] | Line of Credit [Member] |  |
Subsequent Event [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400.0 | 175.0
Maximum Borrowing Capacity under Accordion Feature | $ 450.0 |

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

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- 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
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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