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Financial instruments, Derivatives interest rate swaps (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivatives - interest rate swaps [Abstract] |  |
Notional amount | $ 357,141 | $ 379,916
Fair value | $ 23,673 | 15,600
Swap Pays 2.987% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.987% |
Expiries | Apr. 20, 2023 |
Notional amount | $ 42,000 | 44,400
Fair value | $ 2,541 | 1,748
Swap Pays 3.012%, [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.012% |
Expiries | Apr. 20, 2023 |
Notional amount | $ 42,000 | 44,400
Fair value | $ 2,564 | 1,780
Swap Pays 3.019% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.019% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 30,743 | 33,310
Fair value | $ 2,131 | 1,425
Swap Pays 3.019% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.019% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 29,829 | 32,396
Fair value | $ 2,060 | 1,380
Swap Pays 2.8665% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.8665% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 46,260 | 48,830
Fair value | $ 3,147 | 1,976
Swap Pays 2.8785% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.8785% |
Expiries | Jun. 30, 2023 |
Notional amount | $ 40,673 | 43,240
Fair value | $ 2,513 | 1,681
Swap Pays 2.885% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.885% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 45,618 | 48,188
Fair value | $ 3,139 | 1,961
Swap Pays 2.897% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.897% |
Expiries | Sep. 30, 2023 |
Notional amount | $ 40,851 | 43,419
Fair value | $ 2,792 | 1,789
Swap Pays 3.020% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.02% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 39,167 | 41,734
Fair value | $ 2,786 | $ 1,859

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- Definition The interest rate on the derivative instrument. + References No definition available. + Details
Name: | dht_DerivativeInstrumentInterestRate
Namespace Prefix: | dht_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The maturity date of the derivative instrument. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- 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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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