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v3.19.3

Related Party Transactions - Commercial Agreements (Details) | 9 Months Ended
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Sep. 30, 2019
Minimum |
Related Party Transaction [Line Items] |
Term of agreement | 5 years
Maximum |
Related Party Transaction [Line Items] |
Term of agreement | 10 years

X
- Definition The term of the agreement. Agreement could be a lease, debt, arrangement, services agreement or other arrangement. + References No definition available. + Details
Name: | dk_TermOfAgreement
Namespace Prefix: | dk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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: |