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Stockholders' Equity (Dividends on Series C) (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 18, 2020 | Aug. 12, 2020 | Jul. 01, 2020 | Dec. 31, 2020
Series C Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, cash dividends declared (in dollars per share) | $ 0.40625 | $ 0.40625 | $ 0.53264 | $ 1.345

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