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Segment Reporting - Total Revenue, NOI, and Real Estate by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting      
Total revenue $ 2,294,850 $ 2,301,261 $ 2,324,626
NOI 1,514,678 1,508,184 1,551,891
Gross real estate 24,901,129 23,442,490 22,687,169
Gross real estate assets held for sale 26,176    
Same Store      
Segment Reporting      
Real estate capitalized additions 158,991 126,548 128,324
Operating segment | Same Store      
Segment Reporting      
Total revenue 2,046,173 2,082,183 2,040,575
NOI 1,388,445 1,444,712 1,461,016
Gross real estate 20,124,943 19,965,918 18,453,476
Operating segment | Same Store | New England      
Segment Reporting      
Total revenue 302,919 305,262 287,144
NOI 193,415 200,028 193,106
Gross real estate 2,787,583 2,761,655 2,475,513
Operating segment | Same Store | Metro NY/NJ      
Segment Reporting      
Total revenue 425,653 425,946 429,154
NOI 289,855 294,086 303,859
Gross real estate 4,112,556 4,083,641 3,946,221
Operating segment | Same Store | Mid-Atlantic      
Segment Reporting      
Total revenue 338,455 345,003 351,680
NOI 227,695 239,228 250,142
Gross real estate 3,583,374 3,557,724 3,484,610
Operating segment | Same Store | Southeast Florida      
Segment Reporting      
Total revenue 31,703 29,151 17,709
NOI 19,689 15,730 9,861
Gross real estate 395,999 393,926 242,843
Operating segment | Same Store | Denver, CO      
Segment Reporting      
Total revenue 23,742 21,293 5,694
NOI 16,451 13,796 3,716
Gross real estate 320,435 319,562 77,513
Operating segment | Same Store | Pacific Northwest      
Segment Reporting      
Total revenue 109,907 110,976 107,417
NOI 74,875 77,324 78,063
Gross real estate 1,059,431 1,052,903 956,755
Operating segment | Same Store | Northern California      
Segment Reporting      
Total revenue 361,910 400,934 397,593
NOI 256,417 298,176 305,450
Gross real estate 3,469,149 3,438,290 3,186,075
Operating segment | Same Store | Southern California      
Segment Reporting      
Total revenue 451,884 443,618 444,184
NOI 310,048 306,344 316,819
Gross real estate 4,396,416 4,358,217 4,083,946
Operating segment | Other Stabilized Communities      
Segment Reporting      
Total revenue 104,357 79,431 110,434
NOI 71,014 52,614 74,814
Gross real estate 1,796,752 1,081,327 1,587,397
Operating segment | Development / Redevelopment      
Segment Reporting      
Total revenue 98,379 28,298 28,777
NOI 55,219 10,858 16,061
Gross real estate 2,574,352 1,917,913 2,086,519
Operating segment | Disposals      
Segment Reporting      
Gross real estate   474,792 871,291
Segment Reconciling Items      
Segment Reporting      
Gross real estate 147,546 110,142 0
Non-allocated      
Segment Reporting      
Total revenue 3,084 1,978 4,960
Gross real estate 257,536 367,190 559,777
Continuing Operations      
Segment Reporting      
Total revenue 2,251,993 2,191,890 2,184,746
Continuing Operations | Operating segment | Same Store      
Segment Reporting      
Total revenue 2,046,173 2,082,183 2,040,575
Continuing Operations | Operating segment | Other Stabilized Communities      
Segment Reporting      
Total revenue 104,357 79,431 110,434
Continuing Operations | Non-allocated      
Segment Reporting      
Total revenue $ 3,084 $ 1,978 $ 4,960