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v3.20.1

Related Party Transactions - Commercial Agreements (Details) | 3 Months Ended
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Mar. 31, 2020
Minimum [Member] |
Related Party Transaction [Line Items] |
Commercial Agreements, Initial Term | 5 years
Maximum |
Related Party Transaction [Line Items] |
Commercial Agreements, Initial Term | 10 years

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- Definition Commercial Agreements, Initial Term + References No definition available. + Details
Name: | dk_CommercialAgreementsInitialTerm
Namespace Prefix: | dk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |