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Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Specification of income tax [Abstract]          
Income tax payable $ 587 $ 111 $ 74    
Tax expenses related to previous year 309 32 1    
Change in deferred tax 5 (12) 8    
Total income tax expense 900 131 83    
Specification of Temporary Differences and Deferred Tax [Abstract]          
Property, plant and equipment 2 (13) (164)    
Pensions (612) (420) (539)    
Total basis for deferred tax (610) (432) (703)    
Deferred tax liability (asset), net [1],[2] (140) (102) (155)    
Deferred tax (asset), gross [3] (161) (126) (155)    
Deferred tax liability, gross [3] 21 24 0    
Reconciliation of Effective Tax Rate [Abstract]          
Profit/(loss) before income tax 267,181 73,812 (46,845)    
Expected income tax assessed at the tax rate for the Parent company (0%) 0 0 0    
Adjusted for tax effect of the following items [Abstract]          
Income in subsidiary, subject to income tax 900 131 83    
Total income tax expense $ 900 $ 131 $ 83    
Expected income tax rate 0.00% 0.00% 0.00%    
Changes in Tax Rates [Member]          
Specification of Temporary Differences and Deferred Tax [Abstract]          
General income tax rate   22.00% 23.00% 24.00% 25.00%
[1] Due to materiality, not recognized on a separate line in the statements of financial position.
[2] The general income tax rate is reduced from 23% to 22%, effective from fiscal year 2019, reduced from 24% to 23%, effective from fiscal year 2018 and reduced from 25% to 24%, effective from fiscal year 2017.
[3] Deferred tax liability is related to the subsidiary in Singapore and can not be off-set with the deferred tax asset related to the subsidiary in Norway.