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Charter arrangements (Details Text) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Shipping Revenues [Abstract]
Next month charter hire payment paid in advance	$ 0	$ 2,154	$ 3,575

X

- Definition

Paid in advance

+ References

No definition available.

+ Details

Name:	dht_DeferredShippingRevenuesAbstract
Namespace Prefix:	dht_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Paid in Advance

+ References

No definition available.

+ Details

Name:	dht_NextMonthCharterHirePaymentPaidInAdvance
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant