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General & Administrative Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
General And Administrative Expenses [Abstract] |  |  |
Total Compensation to Employees and Directors | $ 11,655 | $ 15,998 | $ 17,626
Office and Administrative Expenses | 2,147 | 2,213 | 2,407
Audit, Legal and Consultancy | 3,377 | 1,180 | 1,573
Total General and Administrative Expenses | $ 17,180 | $ 19,391 | $ 21,607

X
- Definition The amount of audit, legal and consultancy fees paid or payable by the entity. + References No definition available. + Details
Name: | dht_AuditLegalAndConsultancyFees
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The disclosure of general and administrative expenses. + References No definition available. + Details
Name: | dht_GeneralAndAdministrativeExpensesAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The office and administrative expenses of managing and administering the affairs of an entity. + References No definition available. + Details
Name: | dht_OfficeAndAdministrativeExpenses
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total compensation to employees and directors. + References No definition available. + Details
Name: | dht_TotalCompensationToEmployeesAndDirectors
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating to general and administrative activities of the entity. + References No definition available. + Details
Name: | dht_TotalGeneralAndAdministrativeExpenses
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration