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Earnings Per Common Share and Stockholders' Equity (Stockholders' Equity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 10, 2020
Nov. 21, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]          
Proceeds from issuance of preferred stock, net     $ 290,260 $ 388,893 $ 0
Dividends paid on preferred stock     $ 33,515    
Preferred Stock, Series B          
Class of Stock [Line Items]          
Preferred stock, shares issued 12,000   12,000 0  
Preferred stock dividend rate, percentage 6.625%        
Preferred stock, par value (dollars per share) $ 1.00   $ 1    
Preferred stock, liquidation preference, per share $ 25,000        
Proceeds from issuance of preferred stock, net $ 290,300        
Dividends paid on preferred stock     $ 9,000    
Preferred Stock, Series A          
Class of Stock [Line Items]          
Preferred stock, shares issued   16,000 16,000 16,000  
Preferred stock dividend rate, percentage   5.95%      
Preferred stock, par value (dollars per share)   $ 1.00 $ 1 $ 1  
Preferred stock, liquidation preference, per share   $ 25,000      
Proceeds from issuance of preferred stock, net   $ 388,900      
Dividends paid on preferred stock     $ 24,500