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Equity and Stock-Based Compensation (Preferred Stock Dividends) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Series D Cumulative Preferred Stock | $ 825,000 | $ 825,000 | $ 1,650,000 | $ 1,650,000

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