Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)	9 Months Ended
	Sep. 30, 2018 shares
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	368,018,082
Common Shares Issued:
Conversion of OP Units	12,510
Exercise of share options	194,796
Employee Share Purchase Plan (ESPP)	61,321
Restricted share grants, net	122,877
Common Stock, Shares, Outstanding	368,409,586
Units
Total Units Outstanding	13,768,438
Restricted unit grants, net	267,074
Conversion of OP Units to Common Shares	(12,510)
Total Units Outstanding	14,023,002
Common Shares And Units Outstanding	382,432,588
Units Ownership Interest in Operating Partnership	3.70%