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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