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Equity (Schedule of Share Capital) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure Of Share capital [Line Items] |  |  |
Common stock (amounts in US$ '000) | $ 60,000 | $ 61,000 | $ 59,000
Common shares, of nominal US$ 0.001 | 60,238,026 | 61,029,772 |
US$ per share | $ 0.001 | $ 0.001 | $ 0.001
Number of common shares (US$ 0.001 each) | 5,171,949,000 | 5,171,949,000 |
Amount in US$ | $ 5,171,949 | $ 5,171,949 |
Ordinary shares [member] |  |  |
Disclosure Of Share capital [Line Items] |  |  |
Common shares, of nominal US$ 0.001 | 60,238,026 | 61,029,772 |

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