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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting        
Accounts Receivable, Credit Loss Expense (Reversal)   $ 3,212   $ 10,822
Total revenue $ 587,613 575,982 $ 1,731,060 1,706,015
NOI 409,109 384,381 1,207,680 1,127,317
Gross real estate 23,122,858 21,439,954 23,122,858 21,439,954
Operating Segments | Established        
Segment Reporting        
Total revenue 461,233 449,052 1,369,526 1,327,824
NOI 327,025 320,222 978,642 947,653
Gross real estate 15,692,518 15,597,803 15,692,518 15,597,803
Operating Segments | Established | New England        
Segment Reporting        
Total revenue 64,608 62,705 190,009 184,377
NOI 42,651 41,591 125,362 121,028
Gross real estate 2,103,731 2,090,871 2,103,731 2,090,871
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 103,471 101,285 307,746 299,058
NOI 72,476 72,131 217,531 211,560
Gross real estate 3,539,251 3,520,938 3,539,251 3,520,938
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 73,906 71,715 219,008 212,584
NOI 51,474 50,067 153,599 148,838
Gross real estate 2,678,892 2,666,241 2,678,892 2,666,241
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 28,589 27,723 84,615 81,104
NOI 20,683 19,679 61,498 57,445
Gross real estate 988,952 983,942 988,952 983,942
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 88,914 86,369 264,575 256,351
NOI 68,000 66,362 203,623 197,308
Gross real estate 2,782,426 2,768,192 2,782,426 2,768,192
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 101,745 99,255 303,573 294,350
NOI 71,741 70,392 217,029 211,474
Gross real estate 3,599,266 3,567,619 3,599,266 3,567,619
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 76,727 61,448 220,120 171,466
NOI 51,187 41,537 148,570 114,171
Gross real estate 3,372,470 2,791,565 3,372,470 2,791,565
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 46,450 33,223 122,093 96,633
NOI 30,897 22,622 80,468 65,493
Gross real estate 3,485,596 2,460,076 3,485,596 2,460,076
Operating Segments | Disposals [Member]        
Segment Reporting        
Gross real estate   1,103,809   1,103,809
Land Held for Future Development        
Segment Reporting        
Gross real estate 20,095 116,582 20,095 116,582
Non-allocated        
Segment Reporting        
Total revenue 1,231 912 3,484 2,752
Gross real estate 552,179 473,928 552,179 473,928
Continuing Operations        
Segment Reporting        
Total revenue 585,641 544,635 1,715,223 1,598,675
Continuing Operations | Operating Segments | Established        
Segment Reporting        
Total revenue 461,233 449,052 1,369,526 1,327,824
Continuing Operations | Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 76,727 61,448 220,120 171,466
Continuing Operations | Non-allocated        
Segment Reporting        
Total revenue $ 1,231 $ 912 $ 3,484 $ 2,752