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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting    
Total revenue $ 522,326 $ 508,498
NOI $ 362,583 $ 350,881
% NOI change from prior year 3.30% 21.70%
Gross real estate $ 20,919,484 $ 19,721,229
Gross real estate assets held for sale   20,341
Avalon at Edgewater [Member]    
Segment Reporting    
Gain on business interruption insurance recovery   20,306
Operating Segments | Established    
Segment Reporting    
Total revenue 388,908 366,803
NOI $ 276,106 $ 258,640
% NOI change from prior year 3.90% 7.90%
Gross real estate $ 13,393,588 $ 13,155,449
Operating Segments | Established | New England [Member]    
Segment Reporting    
Total revenue 58,607 57,196
NOI $ 37,816 $ 36,508
% NOI change from prior year 3.30% 15.90%
Gross real estate $ 1,875,024 $ 1,860,863
Operating Segments | Established | Metro NY/NJ    
Segment Reporting    
Total revenue 87,544 83,079
NOI $ 60,060 $ 56,702
% NOI change from prior year 3.80% 3.20%
Gross real estate $ 2,903,317 $ 2,883,958
Operating Segments | Established | Mid-Atlantic    
Segment Reporting    
Total revenue 55,755 57,530
NOI $ 39,147 $ 40,063
% NOI change from prior year 3.70% 1.30%
Gross real estate $ 2,062,311 $ 2,330,106
Operating Segments | Established | Pacific Northwest    
Segment Reporting    
Total revenue 20,454 19,289
NOI $ 14,815 $ 14,078
% NOI change from prior year 5.20% 5.80%
Gross real estate $ 731,537 $ 795,228
Operating Segments | Established | Northern California    
Segment Reporting    
Total revenue 83,323 78,452
NOI $ 63,717 $ 60,248
% NOI change from prior year 2.00% 11.50%
Gross real estate $ 2,815,589 $ 2,651,741
Operating Segments | Established | Southern California    
Segment Reporting    
Total revenue 83,225 71,257
NOI $ 60,551 $ 51,041
% NOI change from prior year 6.20% 9.80%
Gross real estate $ 3,005,810 $ 2,633,553
Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 74,021 73,004
NOI 51,571 56,914
Gross real estate 3,032,689 2,196,700
Operating Segments | Development / Redevelopment    
Segment Reporting    
Total revenue 55,547 53,251
NOI 34,906 35,327
Gross real estate 4,276,266 3,802,952
Land Held for Future Development    
Segment Reporting    
Gross real estate 103,954 477,072
Non-allocated    
Segment Reporting    
Total revenue 1,200 1,524
Gross real estate 112,987 89,056
Continuing Operations    
Segment Reporting    
Total revenue $ 519,676 $ 494,582