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Shareholders' Equity (Schedule Of Dividends) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class Of Stock [Line Items]        
Common stock $ 0.050 $ 0.050 $ 0.100 $ 0.100
Series B [Member]        
Class Of Stock [Line Items]        
Cumulative Redeemable Preferred Stock 0.453 $ 0.453 0.906 $ 0.906
Series C Preferred Stock [Member]        
Class Of Stock [Line Items]        
Cumulative Redeemable Preferred Stock $ 0.406   $ 0.813