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Equity and Stock-Based Compensation (Preferred Stock Dividends) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Series D Preferred Stock        
Class of Stock [Line Items]        
Series D Cumulative Preferred Stock $ 825,000 $ 825,000 $ 2,475,000 $ 2,475,000