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Shareholders' Equity (Summary of Preferred Stock) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Class Of Stock [Line Items] |  |
Preferred stock, shares authorized | 12,500,000 |
Preferred stock | $ 159,541,000 | $ 159,541,000
Series B Preferred Stock [Member] |  |
Class Of Stock [Line Items] |  |
Par value | $ 0.01 |
Liquidation value | $ 25.00 |
Preferred stock, shares authorized | 1,450,000 | 1,450,000
Shares issued | 1,450,000 | 1,450,000
Shares outstanding | 1,450,000 | 1,450,000
Preferred stock | $ 34,767,000 | $ 34,767,000
Series C Preferred Stock [Member] |  |
Class Of Stock [Line Items] |  |
Par value | $ 0.01 |
Liquidation value | $ 25.00 |
Preferred stock, shares authorized | 6,450,000 | 6,450,000
Shares issued | 5,000,000 | 5,000,000
Shares outstanding | 5,000,000 | 5,000,000
Preferred stock | $ 124,774,000 | $ 124,774,000

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