Shareholders' Equity (Schedule Of Dividends) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Class Of Stock [Line Items]
Common stock	$ 0.050	$ 0.050	$ 0.150	$ 0.150
Series B [Member]
Class Of Stock [Line Items]
Cumulative Redeemable Preferred Stock	0.453	$ 0.453	1.359	$ 1.359
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Cumulative Redeemable Preferred Stock	$ 0.406		$ 1.219