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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 175,000  
Preferred stock, shares outstanding (in shares) 175,000  
Common stock, par value (in dollars per share) $ 0.50 $ 0.50
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 232,411,218 232,414,718
Common stock, shares outstanding (in shares) 232,411,218 232,414,718
Series B 10% Convertible Preferred Stock    
Preferred stock, dividend rate 10.00% 10.00%