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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 14, 2023
Sep. 14, 2023
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stockholders' Equity Note [Line Items]            
Preferred stock, par value per share     $ 0.01 $ 0.01 $ 0.01  
Preferred stock redeemed, value       $ 11,230,000 $ 14,730,000  
Series D Preferred Stock [Member]            
Stockholders' Equity Note [Line Items]            
Preferred stock, dividend rate         4.50% 4.50%
Series I Preferred Stock [Member]            
Stockholders' Equity Note [Line Items]            
Preferred stock, dividend rate       3.00% 3.00% 3.00%
Series G Preferred Stock [Member]            
Stockholders' Equity Note [Line Items]            
Preferred stock, dividend rate         6.00% 6.00%
Series J Preferred Stock [Member]            
Stockholders' Equity Note [Line Items]            
Preferred stock, par value per share $ 0.01          
Preferred stock, dividend rate       8.00%    
Proceeds from issuance of private placement $ 15,270,000          
Shares issued 1,527          
Series H Preferred Stock [Member]            
Stockholders' Equity Note [Line Items]            
Preferred stock, dividend rate   3.50% 3.50% 3.50% 3.50% 3.50%
Preferred stock redeemed, shares   22 1,101      
Preferred stock, redemption price   $ 10,000 $ 10,000 $ 10,000    
Preferred stock redeemed, value   $ 220,000 $ 11,000,000.0