Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	369,405,161	368,018,082
Common Shares Issued:
Conversion of OP Units	184,878	5,000
Exercise of share options	709,071	45,391
Employee Share Purchase Plan (ESPP)	18,901	35,177
Restricted share grants, net	144,390	108,261
Common Stock, Shares, Outstanding	370,462,401	368,211,911
Units
Total Units Outstanding	13,904,035	13,768,438
Restricted unit grants, net	133,214	263,048
Conversion of OP Units to Common Shares	(184,878)	(5,000)
Total Units Outstanding	13,852,371	14,026,486
Common Shares And Units Outstanding	384,314,772	382,238,397
Units Ownership Interest in Operating Partnership	3.60%	3.70%