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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 21, 2021
Dec. 15, 2020
Sep. 01, 2020
Aug. 31, 2020
Aug. 10, 2020
Jul. 13, 2020
Dec. 31, 2021
Dec. 31, 2020
Stockholders' Equity Note [Line Items]                
Preferred stock redeemed, value               $ 10,485
Series H Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate   3.50% 3.50%     3.50% 3.50% 3.50%
Proceeds from issuance of private placement   $ 2,300 $ 5,900     $ 3,100    
Shares issued   225 590     308    
Series F Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate       6.00%       6.00%
Preferred stock redeemed, shares       6,465        
Preferred stock, redemption price       $ 1,000        
Preferred stock redeemed, value       $ 6,500        
Series C Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate         6.00%     6.00%
Preferred stock redeemed, shares         388      
Preferred stock, redemption price         $ 10,000      
Preferred stock redeemed, value         $ 3,900      
Series G Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate             6.00% 6.00%
Series I Preferred Stock [Member]                
Stockholders' Equity Note [Line Items]                
Preferred stock, dividend rate 0.01%           3.00%  
Proceeds from issuance of private placement $ 3,200              
Shares issued 320