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Vessels and subsidiaries, Vessels and time charter contracts (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) Vessel | Dec. 31, 2019 USD ($)
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Net book value |  | $ 1,476,436,000 |  |  | $ 1,476,436,000 | $ 1,589,444,000
Depreciation and amortisation expense [abstract] |  |  |  |  |  |
Estimated scrap rate used as a basis for depreciation per ton |  |  |  |  | 300 |
Impairment [Abstract] |  |  |  |  |  |
Non-cash impairment charge |  | $ 7,600,000 | $ 4,900,000 |  | $ 12,600,000 |
Number of vessels recorded non-cash impairment charge | Vessel |  |  |  |  | 3 |
Percentage of estimated weighted average cost of capital |  | 8.59% | 8.12% |  |  |
Percentage of decreasing the weighted average cost of capital |  | 0.50% |  |  |  |
Impact of a 0.5% adverse change of weighted average cost of capital on impairment charge |  | $ 1,500,000 |  |  |  |
Increasing/(decreasing) in future charter rates per day |  | 500 |  |  |  |
Impact of $500 per day adverse change of future charter rates on impairment charge |  | 1,400,000 |  |  |  |
Impact of $500 per day favorable change of future charter rates on impairment charge |  | (1,400,000) |  |  |  |
Cost [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | $ 2,106,997,000 | 2,071,456,000
Additions | [1] |  |  |  |  | (1,139,000)
Transferred from vessels upgrades |  |  |  |  | 22,964,000 | 39,795,000
Disposals |  |  |  |  | (8,505,000) | (3,116,000)
Balance, end of period |  | 2,121,456,000 |  |  | 2,121,456,000 | 2,106,997,000
Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | (517,553,000) | (405,647,000)
Charge for the period |  |  |  |  | (123,412,000) | (115,022,000)
Impairment charges |  |  |  |  | (12,560,000) |
Disposals |  |  |  |  | 8,505,000 | 3,116,000
Balance, end of period |  | (645,020,000) |  |  | (645,020,000) | (517,553,000)
Vessel Upgrades [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 11,652,000 | 0
Additions |  |  |  |  | 28,581,000 | 51,446,000
Transferred to vessels |  |  |  |  | (22,964,000) | (39,795,000)
Balance, end of period |  | 17,269,000 |  |  | 17,269,000 | 11,652,000
Time Charter Contracts [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Net book value |  | 452,000 |  |  | 452,000 | 1,430,000
Time Charter Contracts [Member] | Cost [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 6,600,000 | 6,600,000
Additions | [1] |  |  |  |  | 0
Transferred from vessels upgrades |  |  |  |  | 0 | 0
Disposals |  |  |  |  | 0 | 0
Balance, end of period |  | 6,600,000 |  |  | 6,600,000 | 6,600,000
Time Charter Contracts [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | (5,170,000) | (4,193,000)
Charge for the period |  |  |  |  | (978,000) | (978,000)
Impairment charges |  |  |  |  | 0 |
Disposals |  |  |  |  |  | 0
Balance, end of period |  | (6,148,000) |  |  | (6,148,000) | (5,170,000)
Time Charter Contracts [Member] | Vessel Upgrades [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0 | 0
Additions |  |  |  |  | 0 | 0
Transferred to vessels |  |  |  |  | 0 | 0
Balance, end of period |  | 0 |  |  | 0 | 0
VLCC [Member] |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |
Impairment rate for time charter equivalents, remaining period in current year |  |  | $ 20,107 |  |  |
Impairment rate for time charter equivalents, first year |  |  | 21,550 |  | 19,610 |
Impairment rate for time charter equivalents, second year |  |  | 21,194 |  | 25,279 |
Impairment rate for time charter equivalents, thereafter |  |  | $ 42,557 |  | $ 42,466 |
Percentage of reduction in impairment rate |  |  | 20.00% |  | 20.00% |
Consideration period for reduction in impairment rate |  |  |  |  | 15 years |
VLCC [Member] | VLCCs built 2015 and Later [Member] |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |
Lower fuel consumption for modern vessels |  |  | $ 4,000 |  | $ 4,000 |
Vessels [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Net book value |  | 1,422,279,000 |  |  | $ 1,422,279,000 | 1,526,097,000
Depreciation and amortisation expense [abstract] |  |  |  |  |  |
Estimated useful life of assets |  |  |  |  | 20 years |
Vessels [Member] | Cost [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | $ 2,014,093,000 | 2,007,385,000
Additions | [1] |  |  |  |  | (42,000)
Transferred from vessels upgrades |  |  |  |  | 4,896,000 | 6,750,000
Disposals |  |  |  |  | 0 | 0
Balance, end of period |  | 2,018,989,000 |  |  | 2,018,989,000 | 2,014,093,000
Vessels [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | (487,996,000) | (391,894,000)
Charge for the period |  |  |  |  | (96,153,000) | (96,102,000)
Impairment charges |  |  |  |  | (12,560,000) |
Disposals |  |  |  |  |  | 0
Balance, end of period |  | (596,709,000) |  |  | (596,709,000) | (487,996,000)
Vessels [Member] | Vessel Upgrades [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 1,371,000 | 0
Additions |  |  |  |  | 6,313,000 | 8,121,000
Transferred to vessels |  |  |  |  | (4,896,000) | (6,750,000)
Balance, end of period |  | 2,788,000 |  |  | 2,788,000 | 1,371,000
Drydock [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Net book value |  | 22,665,000 |  |  | 22,665,000 | 25,941,000
Drydock [Member] | Cost [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 43,820,000 | 44,818,000
Additions | [1] |  |  |  |  | (375,000)
Transferred from vessels upgrades |  |  |  |  | 9,480,000 | 2,493,000
Disposals |  |  |  |  | (8,505,000) | (3,116,000)
Balance, end of period |  | 44,795,000 |  |  | 44,795,000 | 43,820,000
Drydock [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | (17,880,000) | (9,171,000)
Charge for the period |  |  |  |  | (12,756,000) | (11,824,000)
Impairment charges |  |  |  |  | 0 |
Disposals |  |  |  |  | 8,505,000 | 3,116,000
Balance, end of period |  | (22,130,000) |  |  | (22,130,000) | (17,880,000)
Drydock [Member] | Vessel Upgrades [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0 | 0
Additions |  |  |  |  | 12,745,000 | 2,493,000
Transferred to vessels |  |  |  |  | (9,480,000) | (2,493,000)
Balance, end of period |  | 3,265,000 |  |  | 3,265,000 | 0
Scrubbers [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Net book value |  | 31,039,000 |  |  | 31,039,000 | $ 35,976,000
Depreciation and amortisation expense [abstract] |  |  |  |  |  |
Estimated useful life of assets |  |  |  |  |  | 3 years
Impairment [Abstract] |  |  |  |  |  |
Lower fuel consumption for modern vessels |  |  | $ 3,000 |  | 4,000 |
Scrubbers [Member] | Cost [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 42,482,000 | $ 12,652,000
Additions | [1] |  |  |  |  | (721,000)
Transferred from vessels upgrades |  |  |  |  | 8,589,000 | 30,552,000
Disposals |  |  |  |  | 0 | 0
Balance, end of period |  | 51,071,000 |  |  | 51,071,000 | 42,482,000
Scrubbers [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | (6,507,000) | (388,000)
Charge for the period |  |  |  |  | (13,525,000) | (6,118,000)
Impairment charges |  |  |  |  | 0 |
Disposals |  |  |  |  |  | 0
Balance, end of period |  | (20,032,000) |  |  | (20,032,000) | (6,507,000)
Scrubbers [Member] | Vessel Upgrades [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 10,281,000 | 0
Additions |  |  |  |  | 9,524,000 | 40,832,000
Transferred to vessels |  |  |  |  | (8,589,000) | (30,552,000)
Balance, end of period |  | 11,216,000 |  |  | 11,216,000 | $ 10,281,000
DHT Cathy and DHT Sophie [Member] |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |
Impairment charges |  |  |  | $ 3,500,000 |  |
DHT China [Member] |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  | 2,800,000 |
Recoverable amount |  | 38,400,000 |  |  | 38,400,000 |
DHT Europe [Member] |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  | 6,300,000 |
Recoverable amount |  | 38,000,000 |  |  | 38,000,000 |
DHT Scandinavia [Member] |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  | 3,500,000 |
Recoverable amount |  | $ 40,400,000 |  |  | $ 40,400,000 |
[1] | Additions in 2019 relates to adjustments to capitalized expenses in 2018.

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- Definition The time charter equivalent Freight Forwards Agreement rates used for the impairment test per day for the remaining period of the current year. + References No definition available. + Details
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