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Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |  |
Common stock | $ 0.200 | $ 0.200 | $ 0.200
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 | $ 0.388
Dividend rate percentage | 6.50% | 6.50% | 6.50%

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