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Earnings Per Common Share and Stockholders' Equity (Stockholders' Equity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 10, 2020
Nov. 21, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Class of Stock [Line Items]          
Dividends paid on preferred stock     $ 10,919 $ 6,611  
Preferred Stock, Series B          
Class of Stock [Line Items]          
Preferred stock, shares issued 12,000   12,000   12,000
Preferred stock, dividend rate, percentage 6.625%        
Preferred stock, par value per share $ 1.00   $ 1   $ 1
Preferred stock, liquidation preference, per share $ 25,000        
Proceeds from issuance of preferred stock, net $ 290,300        
Dividends paid on preferred stock     $ 5,000    
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 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     $ 5,900 $ 6,600