Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)	6 Months Ended
	Jun. 30, 2017 shares
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	365,870,924
Common Shares Issued:
Conversion of OP Units	1,101,589
Exercise of share options	195,400
Employee Share Purchase Plan (ESPP)	39,760
Restricted share grants, net	91,092
Common Stock, Shares, Outstanding	367,298,765
Units
Total Units Outstanding	14,626,075
Restricted unit grants, net	291,647
Conversion of OP Units to Common Shares	(1,101,589)
Total Units Outstanding	13,816,133
Common Shares And Units Outstanding	381,114,898
Units Ownership Interest in Operating Partnership	3.60%