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Stockholder's Equity (Preferred Stock Activity) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares        
Beginning balance (in shares) 0 14,369,965 14,370,060  
Shares converted (in shares) 0 (14,369,965) (95)  
Ending balance (in shares) 0 0 14,369,965 14,370,060
Weighted Avg. Dividend Rate        
Beginning balance 0.00% 0.00% 6.50% 6.50%
Shares converted 0.00% 6.50% 6.50%  
Ending balance 0.00% 0.00% 6.50% 6.50%