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Segment Reporting (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 578,522 | $ 575,982 | $ 569,239 | $ 560,792 | $ 555,292 | $ 550,500 | $ 530,512 | $ 522,326 | $ 2,284,535 | $ 2,158,628 | $ 2,045,255
NOI |  |  |  |  |  |  |  |  | 1,539,586 | 1,419,991 | 1,313,987
Gross real estate | 22,277,169 |  |  |  | 21,935,936 |  |  |  | 22,277,169 | 21,935,936 | 20,755,780
Gross real estate assets held for sale | 65,408 |  |  |  |  |  |  |  | 65,408 |  | 20,846
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | 26 | 3,498 | 20,564
Established Communities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Real estate capitalized additions | 78,469 |  |  |  | 78,241 |  |  |  | 78,469 | 78,241 | 85,676
Operating segment | Established Communities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,632,426 | 1,591,665 | 1,432,109
NOI |  |  |  |  |  |  |  |  | 1,165,509 | 1,139,261 | 1,018,919
Gross real estate | 13,961,942 |  |  |  | 13,884,082 |  |  |  | 13,961,942 | 13,884,082 | 12,326,913
Operating segment | Established Communities | New England |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 239,638 | 232,688 | 209,935
NOI |  |  |  |  |  |  |  |  | 157,109 | 152,514 | 136,019
Gross real estate | 2,014,158 |  |  |  | 1,993,653 |  |  |  | 2,014,158 | 1,993,653 | 1,667,171
Operating segment | Established Communities | Metro NY/NJ |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 360,430 | 354,444 | 294,199
NOI |  |  |  |  |  |  |  |  | 254,132 | 251,760 | 204,882
Gross real estate | 3,086,133 |  |  |  | 3,071,563 |  |  |  | 3,086,133 | 3,071,563 | 2,412,742
Operating segment | Established Communities | Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 237,113 | 232,987 | 203,003
NOI |  |  |  |  |  |  |  |  | 165,724 | 161,546 | 141,624
Gross real estate | 2,226,315 |  |  |  | 2,216,292 |  |  |  | 2,226,315 | 2,216,292 | 1,862,091
Operating segment | Established Communities | Pacific Northwest |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 86,571 | 84,313 | 79,958
NOI |  |  |  |  |  |  |  |  | 62,194 | 61,705 | 57,857
Gross real estate | 727,652 |  |  |  | 724,751 |  |  |  | 727,652 | 724,751 | 731,277
Operating segment | Established Communities | Northern California |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 366,834 | 357,209 | 331,610
NOI |  |  |  |  |  |  |  |  | 280,994 | 273,940 | 253,582
Gross real estate | 2,986,068 |  |  |  | 2,972,311 |  |  |  | 2,986,068 | 2,972,311 | 2,812,859
Operating segment | Established Communities | Southern California |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 341,840 | 330,024 | 313,404
NOI |  |  |  |  |  |  |  |  | 245,356 | 237,796 | 224,955
Gross real estate | 2,921,616 |  |  |  | 2,905,512 |  |  |  | 2,921,616 | 2,905,512 | 2,840,773
Operating segment | Other Stabilized Communities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 262,053 | 193,594 | 221,272
NOI |  |  |  |  |  |  |  |  | 178,172 | 127,678 | 151,475
Gross real estate | 2,934,711 |  |  |  | 2,571,356 |  |  |  | 2,934,711 | 2,571,356 | 2,650,966
Operating segment | Development / Redevelopment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 297,619 | 235,266 | 207,049
NOI |  |  |  |  |  |  |  |  | 195,905 | 153,052 | 143,593
Gross real estate | 5,201,454 |  |  |  | 4,104,956 |  |  |  | 5,201,454 | 4,104,956 | 4,154,778
Operating segment | Disposals [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Gross real estate |  |  |  |  | 1,228,314 |  |  |  |  | 1,228,314 | 1,458,130
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Gross real estate | 84,712 |  |  |  | 68,364 |  |  |  | 84,712 | 68,364 | 84,293
Non-allocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,572 | 4,147 | 5,599
Gross real estate | $ 94,350 |  |  |  | $ 78,864 |  |  |  | 94,350 | 78,864 | 80,700
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,195,670 | 2,024,672 | 1,866,029
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | 26 | 3,498 | 20,529
Continuing Operations | Operating segment | Established Communities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,632,426 | 1,591,665 | 1,432,109
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | 26 | 3 | 152
Continuing Operations | Operating segment | Other Stabilized Communities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 262,053 | 193,594 | 221,272
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | 0 | 0 | 65
Continuing Operations | Non-allocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,572 | 4,147 | 5,599
Business interruption insurance proceeds |  |  |  |  |  |  |  |  | $ 0 | 0 | 0
Avalon Maplewood |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Business interruption insurance proceeds |  |  |  |  |  |  |  |  |  | $ 3,495 |
Avalon at Edgewater |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Business interruption insurance proceeds |  |  |  |  |  |  |  |  |  |  | $ 20,306

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