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Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details)
 3 Months Ended
Mar. 31, 2017
shares
Equity Capital And Other Interests [Abstract]  
Common Stock, Shares, Outstanding 365,870,924
Common Shares Issued:  
Conversion of OP Units 1,087,684
Exercise of share options 72,596
Employee Share Purchase Plan (ESPP) 29,808
Restricted share grants, net 76,745
Common Stock, Shares, Outstanding 367,137,757
Units  
Total Units Outstanding 14,626,075
Restricted unit grants, net 289,081
Conversion of OP Units to Common Shares (1,087,684)
Total Units Outstanding 13,827,472
Common Shares And Units Outstanding 380,965,229
Units Ownership Interest in Operating Partnership 3.60%