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Earnings per Share (Weighted-average Number of Ordinary Shares) (Details) - shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract] |  |  |
Balance as at January 1 | 1,279,379 | 1,278,084 | 1,276,238
Shares issued during the year | 29 | 98 | 73
Shares vested | 618 | 768 | 898
Weighted average number of ordinary shares used in computation of the basic earnings per share | 1,280,026 | 1,278,950 | 1,277,209

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