Statement Of Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Equity [Abstract]
Issuance of preferred shares, shares	22,600		22,600	11,400
Redemption of preferred shares, shares	19,800	11,500	19,800	22,900
Issuance of common shares in connection with share-based compensation, shares	23,896	79,231	80,303	163,642
Common shareholders and restricted share unitholders, per share distribution	$ 2.00	$ 2.00	$ 4.00	$ 4.00