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Capital Structure (Schedule Of Number Of Shares, Net Of Treasury) (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Capital Structure [Abstract]    
Number of shares, net of treasury: Statement of changes in equity 56,833,925 56,832,370
Less: Non-vested equity shares that have not vested (Note 13) 860,817 (911,856)
Number of shares, net of treasury excluding non-vested equity shares that have not vested 55,973,108 55,920,514