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Earnings per Share (Weighted-average Number of Ordinary Shares) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]      
Balance as at January 1 1,278,084 1,276,238 1,274,298
Shares issued during the year 98 73 1,054
Shares vested 768 898 720
Weighted average number of ordinary shares used in computation of the basic earnings per share 1,278,950 1,277,209 1,276,072