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Equity, Capital and Other Interests - Changes in the Company 's Issued and Outstanding Common Shares and Units (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Capital And Other Interests [Abstract]      
Common Stock, Shares, Outstanding 371,670,884 369,405,161 368,018,082
Common Shares Issued:      
Conversion of OP Units 122,505 313,940 131,477
Exercise of share options 239,695 1,745,050 1,056,388
Employee Share Purchase Plan (ESPP) 90,196 48,131 75,414
Restricted share grants, net 178,720 158,602 123,800
Common Stock, Shares, Outstanding 372,302,000 371,670,884 369,405,161
Units      
Total Units Outstanding 13,731,315 13,904,035 13,768,438
Restricted unit grants, net 249,263 141,220 267,074
Conversion of OP Units to Common Shares (122,505) (313,940) (131,477)
Total Units Outstanding 13,858,073 13,731,315 13,904,035
Common Shares And Units Outstanding 386,160,073 385,402,199 383,309,196
Units Ownership Interest in Operating Partnership 3.60% 3.60% 3.60%