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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% |

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- 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

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- 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
Name: | dht_DebtInstrumentCarryingAmount
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- 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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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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 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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | dht_CreditFacilityAxis=dht_CreditAgricoleCreditFacilityMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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- Details
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Balance Type: |
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- Details
Name: | dht_CreditFacilityAxis=dht_AbnAmroCreditFacilityOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | dht_CreditFacilityAxis=dht_ConvertibleSeniorNotesDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |