Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)	9 Months Ended
	Sep. 30, 2017 shares
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	365,870,924
Common Shares Issued:
Conversion of OP Units	1,107,735
Exercise of share options	343,527
Employee Share Purchase Plan (ESPP)	54,843
Restricted share grants, net	85,451
Common Stock, Shares, Outstanding	367,462,480
Units
Total Units Outstanding	14,626,075
Restricted unit grants, net	291,647
Conversion of OP Units to Common Shares	(1,107,735)
Total Units Outstanding	13,809,987
Common Shares And Units Outstanding	381,272,467
Units Ownership Interest in Operating Partnership	3.60%