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Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class Of Stock [Line Items] |  |  |  |
Common stock | $ 0.066 | $ 0.066 | $ 0.132 | $ 0.396
Series B Preferred Stock [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Cumulative Redeemable Preferred Stock | $ 0.453 | $ 0.453 | $ 0.906 | $ 0.906
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 | $ 0.813 | $ 0.813
Dividend rate percentage | 6.50% | 6.50% | 6.50% | 6.50%

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