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Organization And Summary Of Significant Accounting Policies (Schedule Of Preferred Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Shares Outstanding 14,700,000 7,600,000
Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Shares Outstanding   4,600,000
Aggregate Liquidation Preference $ 115,000  
Distribution Rate 8.00%  
Dividend Per Share $ 0.8722 $ 2.0000
Series C Preferred Shares [Member]    
Class of Stock [Line Items]    
Shares Outstanding 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 [Member]    
Class of Stock [Line Items]    
Shares Outstanding 7,700,000  
Aggregate Liquidation Preference $ 192,500  
Distribution Rate 6.50%  
Dividend Per Share $ 1.0157  
Series E Preferred Shares [Member]    
Class of Stock [Line Items]    
Shares Outstanding 4,000,000  
Aggregate Liquidation Preference $ 100,000  
Distribution Rate 6.50%  
Dividend Per Share $ 0.3069