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Vessels and subsidiaries, Vessels and time charter contracts (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 08, 2018 Building | Mar. 31, 2017 Carrier Building | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Building | Dec. 31, 2017 USD ($)
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | $ 1,589,444,000 | $ 1,665,810,000 |
Acquisition of VLCCs [Abstract] |  |  |  |  |  |  |  |  |
Number of VLCCs acquired | Carrier |  |  | 11 |  |  |  |  |  |
Depreciation and amortisation expense [abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of assets |  |  |  |  |  |  | 20 years |  |
Estimated scrap rate used as a basis for depreciation per ton |  |  |  |  |  |  | $ 300 |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  | $ 7,900,000 |  |  |  |
Reversal of impairment charge |  |  |  |  | $ 7,400,000 |  |  |  |
Percentage of estimated weighted average cost of capital |  |  |  |  | 8.57% |  |  |  |
Cost [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 2,071,456,000 | 1,810,158,000 |
Additions | [1] |  |  |  |  |  | (1,139,000) |  |
Additions |  |  |  |  |  |  |  | 15,373,000 |
Transferred from vessels upgrades |  |  |  |  |  |  | 39,795,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  |  | 336,890,000 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | (3,116,000) | (90,965,000) |
Net balances at year end |  |  |  |  | $ 1,810,158,000 |  | 2,106,997,000 | 2,071,456,000 | $ 1,810,158,000
Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | (405,647,000) | (366,013,000) |
Charge for the period |  |  |  |  |  |  | (115,022,000) | (103,259,000) |
Impairment charges |  |  |  |  |  |  |  | (3,500,000) |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 3,116,000 | 67,125,000 |
Net balances at year end |  |  |  |  | (366,013,000) |  | (517,553,000) | (405,647,000) | (366,013,000)
Vessels Under Construction [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 | 114,759,000 |
Additions |  |  |  |  |  |  |  | 222,131,000 |
Transferred from vessels under construction |  |  |  |  |  |  |  | (336,890,000) |
Net balances at year end |  |  |  |  | 114,759,000 |  |  | 0 | 114,759,000
Vessel Upgrades [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  | 51,446,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  | (39,795,000) |  |
Net balances at year end |  |  |  |  |  |  | 11,652,000 | 0 |
Time Charter Contracts [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | 1,430,000 | 2,407,000 |
Time Charter Contracts [Member] | Cost [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 6,600,000 | 6,600,000 |
Additions | [1] |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  |  | 0 |
Transferred from vessels upgrades |  |  |  |  |  |  | 0 |  |
Transferred from vessels under construction |  |  |  |  |  |  |  | 0 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | 0 |
Net balances at year end |  |  |  |  | 6,600,000 |  | 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] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | (4,193,000) | (3,215,000) |
Charge for the period |  |  |  |  |  |  | (978,000) | (978,000) |
Impairment charges |  |  |  |  |  |  |  | 0 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | 0 |
Net balances at year end |  |  |  |  | (3,215,000) |  | (5,170,000) | (4,193,000) | (3,215,000)
Time Charter Contracts [Member] | Vessels Under Construction [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 | 0 |
Additions |  |  |  |  |  |  |  | 0 |
Transferred from vessels under construction |  |  |  |  |  |  |  | 0 |
Net balances at year end |  |  |  |  | 0 |  |  | 0 | 0
Time Charter Contracts [Member] | Vessel Upgrades [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  | 0 |  |
Transferred from vessels under construction |  |  |  |  |  |  | 0 |  |
Net balances at year end |  |  |  |  |  |  | 0 | 0 |
VLCC [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Reversal of impairment charge |  |  |  |  |  |  |  |  | 17,100,000
Impairment rate for time charter equivalents, first year |  |  |  |  |  |  |  |  | 15,154
Impairment rate for time charter equivalents, second year |  |  |  |  |  |  |  |  | 21,349
Impairment rate for time charter equivalents, thereafter |  |  |  |  |  |  |  |  | $ 40,347
Percentage of reduction in impairment rate |  |  |  |  |  |  |  |  | 20.00%
Consideration period for reduction in impairment rate |  |  |  |  |  |  |  |  | 15 years
Impairment charges for vessels on charter if WACC was charged 1% higher |  |  |  |  |  |  |  |  | $ 55,800,000
Impairment charges for fixed charter |  |  |  |  |  |  |  |  | 104,500,000
VLCC [Member] | VLCCs built 2015 and Later [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Lower fuel consumption for modern vessels |  |  |  |  |  |  |  |  | 4,000
VLCC [Member] | VLCCs Built Between 2011 to 2014 [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Lower fuel consumption for modern vessels |  |  |  |  |  |  |  |  | 1,400
VLCC [Member] | First Year Historical Average Spot Rate [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 166,400,000
VLCC [Member] | Fifth Year Historical Average Spot Rate [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 124,800,000
VLCC [Member] | Tenth Year Historical Average Spot Rate [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 85,500,000
Aframax [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment rate for time charter equivalents, first year |  |  |  |  |  |  |  |  | 1,368
Impairment rate for time charter equivalents, second year |  |  |  |  |  |  |  |  | 6,363
Impairment rate for time charter equivalents, thereafter |  |  |  |  |  |  |  |  | 24,705
Vessels [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | $ 1,526,097,000 | 1,615,492,000 |
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] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | $ 2,007,385,000 | 1,767,117,000 |
Additions | [1] |  |  |  |  |  | (42,000) |  |
Additions |  |  |  |  |  |  |  | 113,000 |
Transferred from vessels upgrades |  |  |  |  |  |  | 6,750,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  |  | 325,004,000 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | (84,848,000) |
Net balances at year end |  |  |  |  | 1,767,117,000 |  | 2,014,093,000 | 2,007,385,000 | 1,767,117,000
Vessels [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | (391,894,000) | (359,066,000) |
Charge for the period |  |  |  |  |  |  | (96,102,000) | (91,551,000) |
Impairment charges |  |  |  |  |  |  |  | (3,500,000) |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | 62,224,000 |
Net balances at year end |  |  |  |  | (359,066,000) |  | (487,996,000) | (391,894,000) | (359,066,000)
Vessels [Member] | Vessels Under Construction [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 | 114,759,000 |
Additions |  |  |  |  |  |  |  | 222,131,000 |
Transferred from vessels under construction |  |  |  |  |  |  |  | (336,890,000) |
Net balances at year end |  |  |  |  | 114,759,000 |  |  | 0 | 114,759,000
Vessels [Member] | Vessel Upgrades [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  | 8,121,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  | (6,750,000) |  |
Net balances at year end |  |  |  |  |  |  | 1,371,000 | 0 |
Drydock [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | 25,941,000 | 35,647,000 |
Drydock [Member] | Cost [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 44,818,000 | 36,441,000 |
Additions | [1] |  |  |  |  |  | (375,000) |  |
Additions |  |  |  |  |  |  |  | 7,695,000 |
Transferred from vessels upgrades |  |  |  |  |  |  | 2,493,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  |  | 6,800,000 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | (3,116,000) | (6,117,000) |
Net balances at year end |  |  |  |  | 36,441,000 |  | 43,820,000 | 44,818,000 | 36,441,000
Drydock [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | (9,171,000) | (3,731,000) |
Charge for the period |  |  |  |  |  |  | (11,824,000) | (10,342,000) |
Impairment charges |  |  |  |  |  |  |  | 0 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 3,116,000 | 4,902,000 |
Net balances at year end |  |  |  |  | (3,731,000) |  | (17,880,000) | (9,171,000) | (3,731,000)
Drydock [Member] | Vessels Under Construction [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 | 0 |
Additions |  |  |  |  |  |  |  | 0 |
Transferred from vessels under construction |  |  |  |  |  |  |  | 0 |
Net balances at year end |  |  |  |  | 0 |  |  | 0 | 0
Drydock [Member] | Vessel Upgrades [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  | 2,493,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  | (2,493,000) |  |
Net balances at year end |  |  |  |  |  |  | 0 | 0 |
Scrubbers [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | $ 35,976,000 | 12,264,000 |
Depreciation and amortisation expense [abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of assets |  |  |  |  |  |  | 3 years |  |
Scrubbers [Member] | Cost [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | $ 12,652,000 | 0 |
Additions | [1] |  |  |  |  |  | (721,000) |  |
Additions |  |  |  |  |  |  |  | 7,566,000 |
Transferred from vessels upgrades |  |  |  |  |  |  | 30,552,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  |  | 5,086,000 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | 0 |
Net balances at year end |  |  |  |  | 0 |  | 42,482,000 | 12,652,000 | 0
Scrubbers [Member] | Accumulated Depreciation and Impairment [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | (388,000) | 0 |
Charge for the period |  |  |  |  |  |  | (6,118,000) | (388,000) |
Impairment charges |  |  |  |  |  |  |  | 0 |
Transferred to asset held for sale |  |  |  |  |  |  |  | 0 |
Disposals |  |  |  |  |  |  | 0 | 0 |
Net balances at year end |  |  |  |  | $ 0 |  | (6,507,000) | (388,000) | $ 0
Scrubbers [Member] | Vessel Upgrades [Member] |  |  |  |  |  |  |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |  |  |  |  |  |  |
Net balances at year start |  |  |  |  |  |  | 0 |  |
Additions |  |  |  |  |  |  | 40,832,000 |  |
Transferred from vessels under construction |  |  |  |  |  |  | (30,552,000) |  |
Net balances at year end |  |  |  |  |  |  | $ 10,281,000 | $ 0 |
New Buildings [member] |  |  |  |  |  |  |  |  |
Acquisition of VLCCs [Abstract] |  |  |  |  |  |  |  |  |
Number of VLCC buildings delivered | Building |  |  | 2 |  |  |  |  |  |
New Buildings [member] | Vessels Under Construction [Member] |  |  |  |  |  |  |  |  |
Acquisition of VLCCs [Abstract] |  |  |  |  |  |  |  |  |
Number of VLCC buildings delivered | Building |  | 2 |  |  |  |  |  | 4 |
DHT Cathy and DHT Sophie [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 3,500,000 |  |  |  |  |
DHT Ann and DHT Phoenix [Member] |  |  |  |  |  |  |  |  |
Impairment [Abstract] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | $ 7,500,000 |  |  |
[1] | Additions in 2019 relates to adjustments to capitalized expenses in 2018

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- Definition The amount of impairment loss recognized in profit or loss, If Weighted Average Cost of Capital (WACC) was charged 1% higher. + References No definition available. + Details
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