Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)	3 Months Ended
	Mar. 31, 2018 shares
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	368,018,082
Common Shares Issued:
Conversion of OP Units	5,000
Exercise of share options	45,391
Employee Share Purchase Plan (ESPP)	35,177
Restricted share grants, net	108,261
Common Stock, Shares, Outstanding	368,211,911
Units
Total Units Outstanding	13,768,438
Restricted unit grants, net	263,048
Conversion of OP Units to Common Shares	(5,000)
Total Units Outstanding	14,026,486
Common Shares And Units Outstanding	382,238,397
Units Ownership Interest in Operating Partnership	3.70%