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Shareholders' Equity (Narrative) (Details) - $ / shares | Jul. 20, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Class Of Stock [Line Items] |  |  |
Preferred stock, shares authorized |  | 12,500,000 |
Series B [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock, shares authorized |  | 1,450,000 | 1,450,000
Series C [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock, shares authorized |  | 6,450,000 | 6,450,000
Subsequent Event [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Dividends payable, date declared | Jul. 20, 2020 |  |
Common stock, dividends declared | $ 0.01 |  |
Dividends payable, date to be paid | Aug. 20, 2020 |  |
Dividends payable, date of record | Aug. 10, 2020 |  |
Subsequent Event [Member] | Series B [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividends declared | $ 0.453125 |  |
Subsequent Event [Member] | Series C [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividends declared | $ 0.406250 |  |

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