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Earnings per Share (Weighted-average Number of Ordinary Shares) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Balance as at January 1 1,274,298 1,272,516 1,270,408
Shares Issued During the Year 1,054 0 1,174
Shares vested 720 779 42
Weighted average number of ordinary shares used in computation of the basic earnings per share 1,276,072 1,273,295 1,271,624