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Related Party Transactions Other Agreements (Details) (Paline Pipeline System Capacity Reservation Agreement [Member], USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2013 Maximum [Member]
Related Party Transaction [Line Items] |  |  |  |  |
Monthly Capacity Fee Revenue Amount |  |  |  | $ 450,000 | $ 529,250
Throughput volume subject to agreement |  |  | 30,000 |  |
Monthly Capacity Fee Revenue, Amount Received | $ 229,000 | $ 529,250 |  |  |

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- Definition Monthly Capacity Fee Revenue Amount + References No definition available. + Details
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Period Type: | duration

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- Definition Monthly Capacity Fee Revenue, Amount Received + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Throuput volume subject to agreement + References No definition available. + Details
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Namespace Prefix: | dk_
Data Type: | xbrli:decimalItemType
Balance Type: | na
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