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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 29, 2021
Equity, Class of Treasury Stock [Line Items]        
Preferred stock $ 92,000,000   $ 92,000,000  
Common stock 59,885,000   59,885,000  
Legal surplus 106,200,000   103,300,000  
Stock Repurchase Program Remaining Authorized Repurchase Amount $ 5,500,000      
Stock repurchase program remaining number of shares authorized to be repurchased 243,609      
Stock Repurchase Program Authorized Amount $ 70,000,000      
Share price $ 22.62      
Shares repurchased during period, shares 0 175,000    
Common shares repurchased as part of the stock repurchase program (Value) $ 0 $ 2,226,000    
Share repurchased, average price per share   $ 12.69    
Preferred stock, redemption price per share       $ 25.00
Preferred Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Preferred Stock Issue Costs 10,100,000   10,100,000  
Common Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common Stock Issuance Cost $ 13,600,000   $ 13,600,000