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Financial instruments - Interest bearing debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest bearing debt
Remaining notional	$ 990,299
Carrying amount	$ 967,275	$ 786,204
Nordea Samco Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.5%
Remaining notional	$ 0
Carrying amount	$ 0	217,921
Credit Agricole Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.19%
Remaining notional	$ 62,717
Carrying amount	$ 62,166	68,591
Danish Ship Finance Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.25%
Remaining notional	$ 41,600
Carrying amount	$ 41,437	43,937
Nordea/DNB Credit Facility One [Member]
Interest bearing debt
Interest rate	LIBOR+2.25%
Remaining notional	$ 0
Carrying amount	$ 0	44,647
Nordea/DNB Credit Facility Two [Member]
Interest bearing debt
Interest rate	LIBOR+2.75%
Remaining notional	$ 0
Carrying amount	$ 0	9,884
ABN Amro Credit Facility One [Member]
Interest bearing debt
Interest rate	LIBOR+2.6%
Remaining notional	$ 0
Carrying amount	$ 0	119,844
Nordea BW VLCC Acquisition Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.40
Remaining notional	$ 258,483
Carrying amount	$ 254,870	183,119
ABN Amro Credit Facility Two [Member]
Interest bearing debt
Interest rate	LIBOR+2.4%
Remaining notional	$ 469,639
Carrying amount	464,826
Convertible Senior Notes due 2019 [Member]
Interest bearing debt
Remaining notional	32,860
Carrying amount	$ 32,009	$ 98,262
Interest rate	4.50%
Convertible Senior Notes due 2021 [Member]
Interest bearing debt
Remaining notional	$ 125,000
Carrying amount	$ 111,968
Interest rate	4.50%

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

No definition available.

+ Details

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

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dht_CreditFacilityAxis=dht_CreditAgricoleCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Data Type:	na
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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dht_CreditFacilityAxis=dht_AbnAmroCreditFacilityTwoMember
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Data Type:	na
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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Period Type: