Capital Structure (Schedule Of Number Of Shares, Net Of Treasury) (Details) - shares	Dec. 31, 2020	Dec. 31, 2019
Capital Structure [Abstract]
Number of shares, net of treasury: Statement of changes in equity	56,614,559	56,568,425
Non-vested equity shares that have not vested as of end of period	294,000	583,908
Number of shares, net of treasury excluding non-vested equity shares that have not vested	56,320,559	55,984,517