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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting    
Total revenue $ 560,792 $ 522,326
NOI $ 386,453 $ 355,869
% NOI change from prior year 8.60% 3.40%
Gross real estate $ 22,108,756 $ 20,919,484
Gross real estate assets held for sale 153,151  
Operating Segments | Established    
Segment Reporting    
Total revenue 417,544 382,757
NOI $ 295,357 $ 272,020
% NOI change from prior year 1.20% 3.10%
Gross real estate $ 14,515,336 $ 13,393,588
Operating Segments | Established | New England    
Segment Reporting    
Total revenue 57,909 56,154
NOI $ 37,643 $ 36,180
% NOI change from prior year 1.80% 1.00%
Gross real estate $ 1,973,203 $ 1,875,024
Operating Segments | Established | Metro NY/NJ    
Segment Reporting    
Total revenue 104,096 85,760
NOI $ 71,921 $ 58,938
% NOI change from prior year 0.90% 2.90%
Gross real estate $ 3,722,387 $ 2,903,317
Operating Segments | Established | Mid-Atlantic    
Segment Reporting    
Total revenue 59,159 55,755
NOI $ 41,067 $ 39,147
% NOI change from prior year 0.20% 3.70%
Gross real estate $ 2,233,711 $ 2,062,311
Operating Segments | Established | Pacific Northwest    
Segment Reporting    
Total revenue 21,242 20,454
NOI $ 14,838 $ 14,815
% NOI change from prior year (0.60%) 5.20%
Gross real estate $ 725,487 $ 731,537
Operating Segments | Established | Northern California    
Segment Reporting    
Total revenue 92,197 83,323
NOI $ 70,494 $ 63,717
% NOI change from prior year 1.80% 2.00%
Gross real estate $ 3,017,863 $ 2,815,589
Operating Segments | Established | Southern California    
Segment Reporting    
Total revenue 82,941 81,311
NOI $ 59,394 $ 59,223
% NOI change from prior year 1.90% 5.00%
Gross real estate $ 2,842,685 $ 3,005,810
Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 71,203 70,116
NOI 47,265 48,943
Gross real estate 3,036,815 3,032,689
Operating Segments | Development / Redevelopment    
Segment Reporting    
Total revenue 67,934 55,547
NOI 43,831 34,906
Gross real estate 4,321,466 4,276,266
Land Held for Future Development    
Segment Reporting    
Gross real estate 136,771 103,954
Non-allocated    
Segment Reporting    
Total revenue 886 1,200
Gross real estate 98,368 112,987
Continuing Operations    
Segment Reporting    
Total revenue 557,567 509,620
Continuing Operations | Operating Segments | Established    
Segment Reporting    
Total revenue 417,544 382,757
Continuing Operations | Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 71,203 70,116
Continuing Operations | Non-allocated    
Segment Reporting    
Total revenue $ 886 $ 1,200