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Stockholders' Equity (Dividends) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]          
Preferred stock dividends   $ 4,485 $ 4,485 $ 8,970 $ 8,970
Common stock dividends   $ 90,971 $ 88,270 $ 181,819 $ 176,418
Common stock dividends per share (in dollars per share)   $ 0.5200 $ 0.5150 $ 1.0400 $ 1.0300
Common stock dividends declared (in dollars per share)   $ 0.5200 $ 0.5150 $ 1.0400 $ 1.0300
Subsequent event          
Class of Stock [Line Items]          
Common stock dividends declared (in dollars per share) $ 0.5300        
Series F Preferred Stock          
Class of Stock [Line Items]          
Preferred stock dividends   $ 4,485 $ 4,485 $ 8,970 $ 8,970
Preferred stock dividends per depositary share (in dollars per share)   $ 0.3250 $ 0.3250 $ 0.6500 $ 0.6500
Dividend rate       5.20% 5.20%