Shareholders' Equity (Common Shares) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Number of shares authorized for repurchase (in shares)	35.0
Number of shares repurchased to date	23.7
Shares repurchased pursuant to authorization (in shares)	0.0	0.0	0.0
Common stock dividends paid in aggregate	$ 1,402,000	$ 1,399,000	$ 1,399,000
Distributions to common shareholders and restricted share unitholders (in USD per share)	$ 8.00	$ 8.00	$ 8.00
Preferred share dividends	$ 186,579	$ 207,068	$ 210,179