Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details) - shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	369,405,161	368,018,082
Common Shares Issued:
Conversion of OP Units	188,406	11,494
Exercise of share options	1,059,674	80,875
Employee Share Purchase Plan (ESPP)	27,131	44,858
Restricted share grants, net	158,438	123,027
Common Stock, Shares, Outstanding	370,838,810	368,278,336
Units
Total Units Outstanding	13,904,035	13,768,438
Restricted unit grants, net	140,055	267,074
Conversion of OP Units to Common Shares	(188,406)	(11,494)
Total Units Outstanding	13,855,684	14,024,018
Common Shares And Units Outstanding	384,694,494	382,302,354
Units Ownership Interest in Operating Partnership	3.60%	3.70%