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Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consolidated Statement of Comprehensive Income [Abstract]      
Profit/(loss) for the year $ 266,281 $ 73,680 $ (46,927)
Items that will not be reclassified subsequently to profit or loss:      
Remeasurement of defined benefit obligation, net of tax (141) 224 (148)
Items that may be reclassified subsequently to profit or loss:      
Exchange gain/(loss) on translation of foreign currency denominated associate and subsidiary 95 42 (53)
Total comprehensive income/(loss) for the period net of tax 266,235 73,946 (47,128)
Attributable to the owners of non-controlling interest 14 2 0
Attributable to the owners of parent $ 266,221 $ 73,944 $ (47,128)