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Shareholders' Equity (Dividends) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity Note [Abstract]        
Common stock dividends paid in aggregate $ 351,200 $ 349,800 $ 1,050,000 $ 1,050,000
Distributions to common shareholders and restricted share unitholders (in USD per share) $ 2.00 $ 2.00 $ 6.00 $ 6.00
Preferred share dividends $ 46,237 $ 53,892 $ 138,500 $ 158,849