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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting                      
Total revenue $ 518,240 $ 516,211 $ 502,307 $ 508,498 $ 480,840 $ 475,360 $ 457,459 $ 442,367 $ 2,045,255 $ 1,856,028 $ 1,685,061
NOI                 $ 1,410,697 $ 1,240,992 $ 1,099,587
% NOI change from prior year (percent)                 13.70% 12.90% 16.50%
Gross real estate 20,755,780       19,228,571       $ 20,755,780 $ 19,228,571 $ 17,603,867
Gross real estate assets held for sale 20,846       39,528       20,846 39,528 245,449
Gain on Business Interruption Insurance Recovery                 20,564 1,509 2,494
Established                      
Segment Reporting                      
Real estate capitalized additions 85,676       74,982       85,676 74,982 52,635
Operating segment | Established                      
Segment Reporting                      
Total revenue                 1,542,435 1,347,143 908,821
NOI                 $ 1,084,351 $ 950,099 $ 638,231
% NOI change from prior year (percent)                 4.80% 5.90% 3.60%
Gross real estate 13,511,377       12,391,586       $ 13,511,377 $ 12,391,586 $ 7,360,944
Operating segment | Established | New England                      
Segment Reporting                      
Total revenue                 239,201 182,366 164,181
NOI                 $ 153,669 $ 114,717 $ 104,674
% NOI change from prior year (percent)                 4.90% 2.70% 0.80%
Gross real estate 1,888,524       1,460,746       $ 1,888,524 $ 1,460,746 $ 1,333,854
Operating segment | Established | Metro NY/NJ                      
Segment Reporting                      
Total revenue                 379,151 361,902 285,641
NOI                 $ 258,950 $ 256,907 $ 203,522
% NOI change from prior year (percent)                 1.40% 3.40% 3.30%
Gross real estate 3,212,220       3,152,361       $ 3,212,220 $ 3,152,361 $ 2,251,697
Operating segment | Established | Mid-Atlantic                      
Segment Reporting                      
Total revenue                 233,711 209,013 98,590
NOI                 $ 162,243 $ 145,497 $ 69,498
% NOI change from prior year (percent)                 1.30% 0.20% (2.50%)
Gross real estate 2,339,395       2,177,823       $ 2,339,395 $ 2,177,823 $ 647,374
Operating segment | Established | Pacific Northwest                      
Segment Reporting                      
Total revenue                 79,684 67,900 46,041
NOI                 $ 57,494 $ 48,833 $ 32,012
% NOI change from prior year (percent)                 6.50% 8.50% 6.80%
Gross real estate 737,289       721,040       $ 737,289 $ 721,040 $ 500,247
Operating segment | Established | Northern California                      
Segment Reporting                      
Total revenue                 319,121 273,432 174,527
NOI                 $ 244,458 $ 210,226 $ 132,899
% NOI change from prior year (percent)                 7.00% 11.90% 8.20%
Gross real estate 2,661,258       2,414,184       $ 2,661,258 $ 2,414,184 $ 1,402,444
Operating segment | Established | Southern California                      
Segment Reporting                      
Total revenue                 291,567 252,530 139,841
NOI                 $ 207,537 $ 173,919 $ 95,626
% NOI change from prior year (percent)                 9.10% 9.40% 5.20%
Gross real estate 2,672,691       2,465,432       $ 2,672,691 $ 2,465,432 $ 1,225,328
Operating segment | Other Stabilized                      
Segment Reporting                      
Total revenue                 235,360 221,042 497,634
NOI                 165,530 145,263 343,477
Gross real estate 2,330,503       2,040,269       2,330,503 2,040,269 6,057,783
Operating segment | Development / Redevelopment                      
Segment Reporting                      
Total revenue                 233,431 222,222 186,852
NOI                 160,816 145,630 117,879
Gross real estate 4,755,315       4,238,967       4,755,315 4,238,967 3,972,180
Segment Reconciling Items [Member]                      
Segment Reporting                      
Gross real estate 84,293       484,377       84,293 484,377 180,516
Non-allocated                      
Segment Reporting                      
Total revenue                 5,599 9,947 11,050
Gross real estate $ 74,292       $ 73,372       74,292 73,372 32,444
Continuing Operations                      
Segment Reporting                      
Total revenue                 2,016,825 $ 1,800,354 $ 1,604,357
Avalon at Edgewater [Member]                      
Segment Reporting                      
Gain on Business Interruption Insurance Recovery                 $ 20,306