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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

X

- 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