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Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Class Of Stock [Line Items]        
Common stock $ 0.050 $ 0.050 $ 0.150 $ 0.150
Series B [Member]        
Class Of Stock [Line Items]        
Cumulative Redeemable Preferred Stock $ 0.453 $ 0.453 $ 1.359 $ 1.359
Dividend rate percentage 7.25% 7.25% 7.25% 7.25%
Series C Preferred Stock [Member]        
Class Of Stock [Line Items]        
Cumulative Redeemable Preferred Stock $ 0.406 $ 0.406 $ 1.219 $ 1.219
Dividend rate percentage 6.50% 6.50% 6.50% 6.50%