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General & Administrative Expenses - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allocated Sharebased Compensation Expense [Abstract] |  |  |
Stock compensation expense | $ 4,806 | $ 6,936 | $ 7,436

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements. + References No definition available. + Details
Name: | dht_AllocatedSharebasedCompensationExpense
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The disclosure of the expense recognized from stock compensation. + References No definition available. + Details
Name: | dht_AllocatedSharebasedCompensationExpenseAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration