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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting    
Provision for Doubtful Accounts   $ 4,035
Total revenue $ 566,184 560,792
NOI 399,884 369,286
Gross real estate 22,548,306 20,945,434
Gross real estate assets held for sale 90,153  
Operating Segments | Established    
Segment Reporting    
Total revenue 460,273 444,681
NOI 331,453 316,088
Gross real estate 15,961,439 15,886,513
Operating Segments | Established | New England    
Segment Reporting    
Total revenue 65,481 63,395
NOI 43,152 41,077
Gross real estate 2,188,523 2,181,597
Operating Segments | Established | Metro NY/NJ    
Segment Reporting    
Total revenue 101,202 98,029
NOI 71,843 69,017
Gross real estate 3,527,401 3,513,387
Operating Segments | Established | Mid-Atlantic    
Segment Reporting    
Total revenue 72,008 69,769
NOI 51,052 48,855
Gross real estate 2,671,426 2,659,288
Operating Segments | Established | Pacific Northwest    
Segment Reporting    
Total revenue 27,802 26,488
NOI 20,210 18,623
Gross real estate 986,190 981,609
Operating Segments | Established | Northern California    
Segment Reporting    
Total revenue 93,239 90,086
NOI 72,501 68,916
Gross real estate 3,007,739 2,994,116
Operating Segments | Established | Southern California    
Segment Reporting    
Total revenue 100,541 96,914
NOI 72,695 69,600
Gross real estate 3,580,160 3,556,516
Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 66,798 50,097
NOI 44,948 32,121
Gross real estate 3,026,411 2,476,331
Operating Segments | Development / Redevelopment    
Segment Reporting    
Total revenue 35,580 31,446
NOI 23,483 21,077
Gross real estate 3,360,656 2,365,808
Operating Segments | Disposals [Member]    
Segment Reporting    
Gross real estate   1,316,472
Land Held for Future Development    
Segment Reporting    
Gross real estate 104,963 136,771
Non-allocated    
Segment Reporting    
Total revenue 1,139 886
Gross real estate 94,837 80,011
Continuing Operations    
Segment Reporting    
Total revenue 563,790 527,110
Continuing Operations | Operating Segments | Established    
Segment Reporting    
Total revenue 460,273 444,681
Continuing Operations | Operating Segments | Other Stabilized    
Segment Reporting    
Total revenue 66,798 50,097
Continuing Operations | Non-allocated    
Segment Reporting    
Total revenue $ 1,139 $ 886