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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting        
Total revenue $ 502,307 $ 457,459 $ 1,010,804 $ 899,826
NOI $ 347,776 $ 310,990 $ 705,237 $ 605,402
% NOI change from prior year 11.80% 13.30% 16.50% 13.40%
Gross real estate $ 19,972,681 $ 18,611,288 $ 19,972,681 $ 18,611,288
Gross real estate assets held for sale 77,943 79,128 77,943 79,128
Avalon at Edgewater [Member]        
Segment Reporting        
Gain on Business Interruption Insurance Recovery     20,306  
Operating Segments | Established        
Segment Reporting        
Total revenue 379,853 341,990 753,805 677,211
NOI $ 267,278 $ 241,087 $ 530,808 $ 473,670
% NOI change from prior year 5.00% 5.10% 6.40% 5.20%
Gross real estate $ 13,147,734 $ 12,471,582 $ 13,147,734 $ 12,471,582
Operating Segments | Established | New England [Member]        
Segment Reporting        
Total revenue 58,069 45,162 115,410 89,168
NOI $ 37,170 $ 28,663 $ 73,840 $ 54,224
% NOI change from prior year 2.70% 2.80% 8.90% (0.50%)
Gross real estate $ 1,841,109 $ 1,477,145 $ 1,841,109 $ 1,477,145
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 89,895 95,205 177,684 188,389
NOI $ 61,951 $ 67,148 $ 121,715 $ 131,514
% NOI change from prior year 2.30% 2.90% 2.80% 2.90%
Gross real estate $ 2,889,770 $ 3,191,141 $ 2,889,770 $ 3,191,141
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 58,464 52,263 115,994 103,967
NOI $ 40,530 $ 35,938 $ 80,593 $ 71,969
% NOI change from prior year 2.50% (0.90%) 1.90% (0.80%)
Gross real estate $ 2,331,290 $ 2,170,822 $ 2,331,290 $ 2,170,822
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 22,181 19,047 43,764 37,536
NOI $ 15,843 $ 13,657 $ 31,588 $ 27,030
% NOI change from prior year 5.60% 7.90% 6.20% 8.40%
Gross real estate $ 795,977 $ 719,366 $ 795,977 $ 719,366
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 79,632 67,144 158,084 132,658
NOI $ 60,850 $ 52,635 $ 121,097 $ 102,369
% NOI change from prior year 6.80% 11.70% 9.10% 11.60%
Gross real estate $ 2,653,785 $ 2,409,781 $ 2,653,785 $ 2,409,781
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 71,612 63,169 142,869 125,493
NOI $ 50,934 $ 43,046 $ 101,975 $ 86,564
% NOI change from prior year 10.30% 6.70% 10.10% 9.80%
Gross real estate $ 2,635,803 $ 2,503,327 $ 2,635,803 $ 2,503,327
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 58,511 54,679 134,933 108,755
NOI 38,593 36,566 97,197 71,406
Gross real estate 2,166,893 2,028,096 2,166,893 2,028,096
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 60,460 50,556 113,711 93,582
NOI 41,905 33,337 77,232 60,326
Gross real estate 4,065,071 3,581,408 4,065,071 3,581,408
Land Held for Future Development        
Segment Reporting        
Gross real estate 511,797 487,205 511,797 487,205
Non-allocated        
Segment Reporting        
Total revenue 1,467 2,942 2,990 5,553
Gross real estate 81,186 42,997 81,186 42,997
Continuing Operations        
Segment Reporting        
Total revenue $ 500,291 $ 450,167 $ 1,005,439 $ 885,101