Organization And Summary Of Significant Accounting Policies (Schedule Of Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred shares outstanding (in shares)	14,703,214	14,703,214
Series C Preferred Shares
Class of Stock [Line Items]
Preferred shares outstanding (in shares)	3,000,000	3,000,000
Aggregate Liquidation Preference	$ 75,000
Distribution Rate	6.875%
Dividend Per Share	$ 1.7188	$ 1.7188
Series D Preferred Shares
Class of Stock [Line Items]
Preferred shares outstanding (in shares)	7,701,700	7,701,700
Aggregate Liquidation Preference	$ 192,543
Distribution Rate	6.50%
Dividend Per Share	$ 1.6250	$ 1.6250
Series E Preferred Shares
Class of Stock [Line Items]
Preferred shares outstanding (in shares)	4,001,514	4,001,514
Aggregate Liquidation Preference	$ 100,038
Distribution Rate	6.50%
Dividend Per Share	$ 1.6250	$ 1.6250