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Charter arrangements - Future charter payments (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Future Charter Payments [Abstract] |
2019 | $ 34,044
2020 | 36,837
2021 | 26,293
2022 | 154
Net charter payments | $ 97,327

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- Definition Future Charter Payments Abstract + References No definition available. + Details
Name: | dht_FutureCharterPaymentsAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of future charter payments due in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | dht_FutureCharterPaymentsDueCurrent
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of future charter payments due in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | dht_FutureCharterPaymentsDueInFourYears
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of future charter payments due in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | dht_FutureCharterPaymentsDueInThreeYears
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of future charter payments due in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | dht_FutureCharterPaymentsDueInTwoYears
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total of Future Charter Payments + References No definition available. + Details
Name: | dht_FutureCharterPaymentsTotal
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant