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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRIC 23 on consolidated statement of financial position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Liabilities |  |  |  |
Current tax liabilities, current | $ 3,162 | $ 5,650 |  |
Total liabilities | 1,179,760 | 1,139,074 | $ 1,187,656 |
Shareholders' equity, net |  |  |  |
Retained earnings | 1,503,785 | 1,639,658 |  |
Total shareholders' equity, net | $ 2,799,857 | $ 2,968,200 | $ 3,029,565 | $ 3,063,627

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