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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting    
Total revenue $ 508,498 $ 442,367
NOI $ 358,766 $ 295,627
% NOI change from prior year 21.40% 13.40%
Gross real estate [1] $ 19,721,229 $ 18,173,514
Gross real estate assets held for sale 20,341 201,829
Operating Segments | Established    
Segment Reporting    
Total revenue 375,025 337,249
NOI $ 264,131 $ 233,821
% NOI change from prior year 7.90% 5.30%
Gross real estate $ 13,155,449 $ 12,366,686
Operating Segments | Established | New England [Member]    
Segment Reporting    
Total revenue 58,414 46,034
NOI $ 37,270 $ 26,800
% NOI change from prior year 15.90% (3.80%)
Gross real estate $ 1,860,863 $ 1,429,727
Operating Segments | Established | Metro NY/NJ    
Segment Reporting    
Total revenue 87,789 93,183
NOI $ 59,764 $ 64,366
% NOI change from prior year 3.20% 2.80%
Gross real estate $ 2,883,958 $ 3,141,136
Operating Segments | Established | Mid-Atlantic    
Segment Reporting    
Total revenue 57,530 51,704
NOI $ 40,063 $ 36,031
% NOI change from prior year 1.30% (0.80%)
Gross real estate $ 2,330,106 $ 2,170,104
Operating Segments | Established | Pacific Northwest    
Segment Reporting    
Total revenue 21,583 18,489
NOI $ 15,745 $ 13,373
% NOI change from prior year 6.70% 9.00%
Gross real estate $ 795,228 $ 718,884
Operating Segments | Established | Northern California    
Segment Reporting    
Total revenue 78,452 65,515
NOI $ 60,248 $ 49,734
% NOI change from prior year 11.50% 11.50%
Gross real estate $ 2,651,741 $ 2,405,670
Operating Segments | Established | Southern California    
Segment Reporting    
Total revenue 71,257 62,324
NOI $ 51,041 $ 43,517
% NOI change from prior year 9.80% 13.10%
Gross real estate $ 2,633,553 $ 2,501,165
Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 77,505 54,083
NOI 59,308 34,818
Gross real estate 2,196,700 2,100,918
Operating Segments | Development / Redevelopment    
Segment Reporting    
Total revenue 53,251 43,026
NOI 35,327 26,988
Gross real estate 3,802,952 3,147,624
Land Held for Future Development    
Segment Reporting    
Gross real estate 477,072 529,069
Non-allocated    
Segment Reporting    
Total revenue [2] 1,524 2,611
Gross real estate 89,056 29,217
Continuing Operations    
Segment Reporting    
Total revenue 507,305 $ 436,969
Avalon at Edgewater [Member]    
Segment Reporting    
Gain on Business Interruption Insurance Recovery $ 20,306  
[1] Does not include gross real estate assets held for sale of $20,341 and $201,829 as of
[2] Total revenue and NOI for the three months ended March 31, 2016 includes $20,306 in business interruption insurance proceeds.