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Equity (Preferred Stock Dividends) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Series D Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Series D Cumulative Preferred Stock | $ 3,300,000 | $ 3,300,000 | $ 376,000

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