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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting        
Total revenue $ 516,211 $ 475,360 $ 1,527,015 $ 1,375,187
NOI $ 349,710 $ 314,703 $ 1,043,939 $ 909,849
% NOI change from prior year 11.10% 11.50% 14.70% 12.80%
Gross real estate $ 20,362,663 $ 19,002,878 $ 20,362,663 $ 19,002,878
Gross real estate assets held for sale 135,054   135,054  
Avalon at Edgewater [Member]        
Segment Reporting        
Gain on Business Interruption Insurance Recovery     20,306  
Operating Segments | Established        
Segment Reporting        
Total revenue 389,050 342,425 1,149,093 1,002,850
NOI $ 271,574 $ 239,286 $ 805,774 $ 702,699
% NOI change from prior year 4.30% 5.20% 5.50% 5.20%
Gross real estate $ 13,448,763 $ 12,495,778 $ 13,448,763 $ 12,495,778
Operating Segments | Established | New England [Member]        
Segment Reporting        
Total revenue 59,321 45,245 174,731 132,054
NOI $ 37,657 $ 29,036 $ 111,497 $ 81,883
% NOI change from prior year 0.60% 3.40% 5.90% 0.80%
Gross real estate $ 1,845,679 $ 1,487,944 $ 1,845,679 $ 1,487,944
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 96,231 92,153 283,554 270,406
NOI $ 65,299 $ 65,207 $ 193,001 $ 190,735
% NOI change from prior year 1.50% 3.80% 2.00% 3.10%
Gross real estate $ 3,206,696 $ 3,196,771 $ 3,206,696 $ 3,196,771
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 58,929 52,839 174,922 156,806
NOI $ 40,029 $ 36,157 $ 120,623 $ 108,125
% NOI change from prior year 0.40% 0.30% 1.40% (0.40%)
Gross real estate $ 2,335,116 $ 2,172,951 $ 2,335,116 $ 2,172,951
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 20,216 17,319 59,333 50,563
NOI $ 14,502 $ 12,077 $ 42,753 $ 36,214
% NOI change from prior year 9.50% 5.00% 6.60% 8.00%
Gross real estate $ 736,377 $ 720,223 $ 736,377 $ 720,223
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 80,783 69,850 238,867 202,508
NOI $ 61,560 $ 53,095 $ 182,658 $ 155,464
% NOI change from prior year 5.90% 9.50% 8.00% 10.80%
Gross real estate $ 2,657,020 $ 2,412,264 $ 2,657,020 $ 2,412,264
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 73,570 65,019 217,686 190,513
NOI $ 52,527 $ 43,714 $ 155,242 $ 130,278
% NOI change from prior year 11.10% 7.90% 10.30% 9.10%
Gross real estate $ 2,667,875 $ 2,505,625 $ 2,667,875 $ 2,505,625
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 53,905 56,564 177,016 165,319
NOI 34,812 36,949 125,017 108,355
Gross real estate 2,325,539 2,106,947 2,325,539 2,106,947
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 63,122 59,112 164,865 152,694
NOI 43,324 38,468 113,148 98,795
Gross real estate 3,994,361 3,795,868 3,994,361 3,795,868
Land Held for Future Development        
Segment Reporting        
Gross real estate 519,626 553,729 519,626 553,729
Non-allocated        
Segment Reporting        
Total revenue 1,320 2,161 4,310 7,714
Gross real estate 74,374 50,556 74,374 50,556
Continuing Operations        
Segment Reporting        
Total revenue $ 507,397 $ 460,262 $ 1,495,284 $ 1,328,577