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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