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Segment Reporting (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 66,763 |  | $ 14,072
Total revenue | 2,301,261 | $ 2,324,626 | 2,284,535
NOI | 1,547,190 | 1,594,174 | 1,485,132
Gross real estate | 23,917,282 | 23,157,308 | 21,544,772
Gross real estate assets held for sale | 44,940 |  |
Established Communities |  |  |
Segment Reporting |  |  |
Real estate capitalized additions | 126,548 | 128,324 | 78,469
Operating segment | Established Communities |  |  |
Segment Reporting |  |  |
Total revenue | 2,028,317 | 2,107,288 | 1,731,570
NOI | 1,406,905 | 1,503,300 | 1,244,621
Gross real estate | 19,045,458 | 18,923,614 | 15,239,192
Operating segment | Established Communities | New England |  |  |
Segment Reporting |  |  |
Total revenue | 297,674 | 303,816 | 223,594
NOI | 193,053 | 202,812 | 148,310
Gross real estate | 2,617,725 | 2,595,907 | 1,890,304
Operating segment | Established Communities | Metro NY/NJ |  |  |
Segment Reporting |  |  |
Total revenue | 445,939 | 466,135 | 379,968
NOI | 305,408 | 327,356 | 271,767
Gross real estate | 4,235,524 | 4,214,565 | 3,367,198
Operating segment | Established Communities | Mid-Atlantic |  |  |
Segment Reporting |  |  |
Total revenue | 341,311 | 351,680 | 284,381
NOI | 237,063 | 250,142 | 200,381
Gross real estate | 3,511,960 | 3,484,610 | 2,669,040
Operating segment | Established Communities | Pacific Northwest |  |  |
Segment Reporting |  |  |
Total revenue | 109,321 | 113,021 | 108,861
NOI | 76,093 | 82,186 | 78,313
Gross real estate | 996,317 | 990,563 | 985,102
Operating segment | Established Communities | Northern California |  |  |
Segment Reporting |  |  |
Total revenue | 378,362 | 397,593 | 340,247
NOI | 283,012 | 305,450 | 262,055
Gross real estate | 3,201,926 | 3,186,075 | 2,753,596
Operating segment | Established Communities | Southern California |  |  |
Segment Reporting |  |  |
Total revenue | 432,441 | 451,640 | 394,519
NOI | 298,900 | 321,776 | 283,795
Gross real estate | 4,160,754 | 4,131,539 | 3,573,952
Operating segment | Established Communities | Expansion Markets |  |  |
Segment Reporting |  |  |
Total revenue | 23,269 | 23,403 |
NOI | 13,376 | 13,578 |
Gross real estate | 321,252 | 320,355 |
Operating segment | Other Stabilized Communities |  |  |
Segment Reporting |  |  |
Total revenue | 140,173 | 110,434 | 238,584
NOI | 92,040 | 74,814 | 159,745
Gross real estate | 1,596,656 | 1,587,398 | 3,063,670
Operating segment | Development / Redevelopment |  |  |
Segment Reporting |  |  |
Total revenue | 84,001 | 28,776 | 120,822
NOI | 48,245 | 16,060 | 80,766
Gross real estate | 2,789,062 | 2,086,519 | 2,652,968
Operating segment | Disposals [Member] |  |  |
Segment Reporting |  |  |
Gross real estate |  | 401,152 | 732,397
Segment Reconciling Items |  |  |
Segment Reporting |  |  |
Gross real estate | 110,142 | 0 | 84,712
Non-allocated |  |  |
Segment Reporting |  |  |
Total revenue | 3,819 | 4,960 | 3,572
Gross real estate | 375,964 | 559,777 | 504,230
Continuing Operations |  |  |
Segment Reporting |  |  |
Total revenue | 2,256,310 | 2,251,458 | 2,094,548
Continuing Operations | Operating segment | Established Communities |  |  |
Segment Reporting |  |  |
Total revenue | 2,028,317 | 2,107,288 | 1,731,570
Continuing Operations | Operating segment | Other Stabilized Communities |  |  |
Segment Reporting |  |  |
Total revenue | 140,173 | 110,434 | 238,584
Continuing Operations | Non-allocated |  |  |
Segment Reporting |  |  |
Total revenue | $ 3,819 | $ 4,960 | $ 3,572

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