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Commitments and Contingencies Contracts and Agreements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Long-term Purchase Commitment [Line Items] |
Maximum Exposure for Environmental Remediation under Omnibus Agreement | $ 0.25
Abilene Contract [Member] |
Long-term Purchase Commitment [Line Items] |
Maximum Purchases under Supply Contract | 20,350
East Houston Contract [Member] |
Long-term Purchase Commitment [Line Items] |
Maximum Purchases under Supply Contract | 7,000

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- Definition Maximum Exposure for Environmental Remediation under Omnibus Agreement + References No definition available. + Details
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- Definition Maximum Purchases under Supply Contract + 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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