Equity, Capital and Other Interests - Changes in the Company 's Issued and Outstanding Common Shares and Units (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	369,405,161	368,018,082	365,870,924
Common Shares Issued:
Conversion of OP Units	313,940	131,477	1,149,284
Exercise of share options	1,745,050	1,056,388	846,137
Employee Share Purchase Plan (ESPP)	48,131	75,414	68,286
Restricted share grants, net	158,602	123,800	83,451
Common Stock, Shares, Outstanding	371,670,884	369,405,161	368,018,082
Units
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Restricted unit grants, net	141,220	267,074	291,647
Conversion of OP Units to Common Shares	(313,940)	(131,477)	(1,149,284)
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Common Shares And Units Outstanding	385,402,199	383,309,196	381,786,520
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.60%