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Stockholders' Equity (Dividends) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]      
Preferred stock dividends   $ 4,485 $ 4,485
Common stock dividends   $ 90,848 $ 88,148
Common stock dividends per share (in dollars per share)   $ 0.5200 $ 0.5150
Common stock dividends declared (in dollars per share)   $ 0.5200 $ 0.5150
Subsequent event      
Class of Stock [Line Items]      
Common stock dividends declared (in dollars per share) $ 0.5200    
Series F Preferred Stock      
Class of Stock [Line Items]      
Preferred stock dividends   $ 4,485 $ 4,485
Preferred stock dividends per depositary share (in dollars per share)   $ 0.3250 $ 0.3250
Dividend rate   5.20% 5.20%