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Financial instruments, Derivatives interest rate swaps (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Derivatives - interest rate swaps [Abstract] |  |
Notional amount | $ 379,916 | $ 402,049
Fair value | $ 15,600 | 5,736
Swap Pays 2.987% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.987% |
Expiries | Apr. 20, 2023 |
Notional amount | $ 44,400 | 46,800
Fair value | $ 1,748 | 699
Swap Pays 3.012%, [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.012% |
Expiries | Apr. 20, 2023 |
Notional amount | $ 44,400 | 46,800
Fair value | $ 1,780 | 743
Swap Pays 3.019% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.019% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 33,310 | 35,877
Fair value | $ 1,425 | 580
Swap Pays 3.019% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.019% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 32,396 | 34,963
Fair value | $ 1,380 | 563
Swap Pays 2.8665% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.8665% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 48,830 | 51,400
Fair value | $ 1,976 | 606
Swap Pays 2.8785% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.8785% |
Expiries | Jun. 30, 2023 |
Notional amount | $ 43,240 | 45,807
Fair value | $ 1,681 | 503
Swap Pays 2.885% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.885% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 48,188 | 50,115
Fair value | $ 1,961 | 653
Swap Pays 2.897% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 2.897% |
Expiries | Sep. 30, 2023 |
Notional amount | $ 43,419 | 45,986
Fair value | $ 1,789 | 597
Swap Pays 3.020% [Member] |  |
Derivatives - interest rate swaps [Abstract] |  |
Interest rate | 3.02% |
Expiries | Sep. 29, 2023 |
Notional amount | $ 41,734 | 44,301
Fair value | $ 1,859 | $ 793

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- Definition The interest rate on the derivative instrument. + References No definition available. + Details
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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 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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