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Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class Of Stock [Line Items]      
Common stock $ 0.264 $ 0.528 $ 1.320
Series B Preferred Stock [Member]      
Class Of Stock [Line Items]      
Cumulative Redeemable Preferred Stock $ 1.812 $ 1.812 $ 1.812
Dividend rate percentage 7.25% 7.25% 7.25%
Series C Preferred Stock [Member]      
Class Of Stock [Line Items]      
Cumulative Redeemable Preferred Stock $ 1.625 $ 1.625 $ 1.625
Dividend rate percentage 6.50% 6.50% 6.50%