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Shareholders' Equity (Schedule Of Dividends) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Class Of Stock [Line Items]        
Common stock $ 0.050 $ 0.050 $ 0.100 $ 0.100
Cumulative Redeemable Preferred Stock $ 0.453 $ 0.453 $ 0.906 $ 0.906
Series B [Member]        
Class Of Stock [Line Items]        
Dividend rate percentage     7.25%