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Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Class Of Stock [Line Items] |  |
Common stock | $ 0.066 | $ 0.066
Series B Preferred Stock [Member] |  |
Class Of Stock [Line Items] |  |
Cumulative Redeemable Preferred Stock | $ 0.453 | $ 0.453
Dividend rate percentage | 7.25% | 7.25%
Series C Preferred Stock [Member] |  |
Class Of Stock [Line Items] |  |
Cumulative Redeemable Preferred Stock | $ 0.406 | $ 0.406
Dividend rate percentage | 6.50% | 6.50%

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