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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting        
Total revenue $ 575,982 $ 550,500 $ 1,706,015 $ 1,603,337
NOI 399,870 370,125 1,173,027 1,077,410
Gross real estate 22,435,859 21,546,649 22,435,859 21,546,649
Gross real estate assets held for sale 109,900 53,723 109,900 53,723
Operating Segments | Established        
Segment Reporting        
Total revenue 427,023 417,330 1,266,066 1,236,208
NOI 303,076 293,955 897,954 876,922
Gross real estate 14,585,970 14,411,614 14,585,970 14,411,614
Operating Segments | Established | New England        
Segment Reporting        
Total revenue 60,690 58,872 178,841 174,018
NOI 40,005 38,635 117,008 113,423
Gross real estate 2,006,671 1,988,987 2,006,671 1,988,987
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 106,341 105,225 315,683 311,301
NOI 74,562 71,864 219,396 215,187
Gross real estate 3,729,612 3,617,773 3,729,612 3,617,773
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 59,752 58,561 177,342 174,653
NOI 41,432 40,020 123,056 120,186
Gross real estate 2,223,386 2,213,522 2,223,386 2,213,522
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 22,014 21,531 64,609 62,833
NOI 15,681 15,692 45,753 45,632
Gross real estate 726,752 723,674 726,752 723,674
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 92,292 89,798 274,206 267,316
NOI 70,465 68,731 209,866 205,168
Gross real estate 2,983,019 2,966,133 2,983,019 2,966,133
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 85,934 83,343 255,385 246,087
NOI 60,931 59,013 182,875 177,326
Gross real estate 2,916,530 2,901,525 2,916,530 2,901,525
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 66,542 52,885 195,034 137,739
NOI 45,196 34,746 132,498 88,946
Gross real estate 2,740,944 2,477,846 2,740,944 2,477,846
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 77,499 63,012 217,416 171,297
NOI 51,598 41,424 142,575 111,542
Gross real estate 4,895,487 3,847,578 4,895,487 3,847,578
Operating Segments | Disposals [Member]        
Segment Reporting        
Gross real estate   629,970   629,970
Land Held for Future Development        
Segment Reporting        
Gross real estate 116,582 85,863 116,582 85,863
Non-allocated        
Segment Reporting        
Total revenue 912 993 2,752 3,290
Gross real estate 96,876 93,778 96,876 93,778
Continuing Operations        
Segment Reporting        
Gain on Business Interruption Insurance Recovery   3,495   3,495
Total revenue 571,976 534,220 1,681,268 1,548,534
Continuing Operations | Operating Segments | Established        
Segment Reporting        
Gain on Business Interruption Insurance Recovery   0   0
Total revenue 427,023 417,330 1,266,066 1,236,208
Continuing Operations | Operating Segments | Other Stabilized        
Segment Reporting        
Gain on Business Interruption Insurance Recovery   0   0
Total revenue 66,542 52,885 195,034 137,739
Continuing Operations | Non-allocated        
Segment Reporting        
Gain on Business Interruption Insurance Recovery   0   0
Total revenue $ 912 993 $ 2,752 3,290
Avalon Maplewood [Member]        
Segment Reporting        
Gain on Business Interruption Insurance Recovery   $ 3,495   $ 3,495