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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.

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