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Consolidated statement of comprehensive income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]      
Net (loss) profit $ (607,062) $ 247,002 $ 88,198
Other comprehensive loss not to be reclassified to profit or loss in subsequent periods -      
Remeasurement of actuarial loss, net of amortization (15,454) (4,401) (339)
Total comprehensive (loss) income for the year $ (622,516) $ 242,601 $ 87,859