Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)	6 Months Ended
	Jun. 30, 2018 shares
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	368,018,082
Common Shares Issued:
Conversion of OP Units	11,494
Exercise of share options	80,875
Employee Share Purchase Plan (ESPP)	44,858
Restricted share grants, net	123,027
Common Stock, Shares, Outstanding	368,278,336
Units
Total Units Outstanding	13,768,438
Restricted unit grants, net	267,074
Conversion of OP Units to Common Shares	(11,494)
Total Units Outstanding	14,024,018
Common Shares And Units Outstanding	382,302,354
Units Ownership Interest in Operating Partnership	3.70%