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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
May 01, 2022
Mar. 24, 2022
Feb. 04, 2022
Dec. 21, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Stockholders' Equity Note [Line Items]                  
Preferred stock, par value per share         $ 0.01   $ 0.01   $ 0.01
Preferred stock redeemed, value         $ 9,650,000   $ 14,730,000    
Series D Preferred Stock [Member]                  
Stockholders' Equity Note [Line Items]                  
Preferred stock, dividend rate 4.50%       4.50% 4.50% 4.50% 4.50% 4.50%
Preferred stock redeemed, shares 940                
Preferred stock, redemption price $ 10,000                
Preferred stock redeemed, value $ 9,400,000                
Series I Preferred Stock [Member]                  
Stockholders' Equity Note [Line Items]                  
Preferred stock, par value per share   $ 0.01   $ 0.01          
Preferred stock, dividend rate         3.00%   3.00%   3.00%
Proceeds from issuance of private placement   $ 2,620,000   $ 3,200,000          
Shares issued   260   320          
Series G Preferred Stock [Member]                  
Stockholders' Equity Note [Line Items]                  
Preferred stock, dividend rate     6.00%     6.00%   6.00% 6.00%
Preferred stock redeemed, shares     533            
Preferred stock, redemption price     $ 10,000            
Preferred stock redeemed, value     $ 5,300,000