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Segment Reporting (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting        
Total revenue $ 569,239 $ 530,512 $ 1,130,032 $ 1,052,837
NOI 393,486 358,410 776,625 710,613
Gross real estate 22,179,431 21,088,796 22,179,431 21,088,796
Gross real estate assets held for sale 167,247 15,271 167,247 15,271
Operating Segments | Established        
Segment Reporting        
Total revenue 420,557 410,088 836,330 816,097
NOI 299,075 290,737 592,997 581,056
Gross real estate 14,490,980 14,317,058 14,490,980 14,317,058
Operating Segments | Established | New England        
Segment Reporting        
Total revenue 58,571 57,137 116,480 113,483
NOI 38,354 36,762 75,997 73,733
Gross real estate 1,977,465 1,962,635 1,977,465 1,962,635
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 105,246 103,694 209,342 206,077
NOI 72,913 72,027 144,835 143,323
Gross real estate 3,726,001 3,612,725 3,726,001 3,612,725
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 60,192 59,104 119,351 117,819
NOI 41,759 40,331 82,826 81,314
Gross real estate 2,236,706 2,225,022 2,236,706 2,225,022
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 21,352 20,825 42,594 41,302
NOI 15,234 15,010 30,072 29,940
Gross real estate 726,279 722,654 726,279 722,654
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 91,487 89,133 181,913 177,517
NOI 70,342 68,608 139,400 136,437
Gross real estate 2,978,830 2,961,569 2,978,830 2,961,569
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 83,709 80,195 166,650 159,899
NOI 60,473 57,999 119,867 116,309
Gross real estate 2,845,699 2,832,453 2,845,699 2,832,453
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 68,968 49,298 136,703 92,959
NOI 47,264 32,019 92,650 59,438
Gross real estate 2,833,892 2,400,217 2,833,892 2,400,217
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 71,982 54,890 139,917 108,285
NOI 47,147 35,654 90,978 70,119
Gross real estate 4,625,227 3,634,897 4,625,227 3,634,897
Operating Segments | Disposals [Member]        
Segment Reporting        
Gross real estate   556,331   556,331
Land Held for Future Development        
Segment Reporting        
Gross real estate 130,802 86,016 130,802 86,016
Non-allocated        
Segment Reporting        
Total revenue 954 1,098 1,841 2,298
Gross real estate 98,530 94,277 98,530 94,277
Continuing Operations        
Segment Reporting        
Total revenue 562,461 515,374 1,114,791 1,019,639
Continuing Operations | Operating Segments | Established        
Segment Reporting        
Total revenue 420,557 410,088 836,330 816,097
Continuing Operations | Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 68,968 49,298 136,703 92,959
Continuing Operations | Non-allocated        
Segment Reporting        
Total revenue $ 954 $ 1,098 $ 1,841 $ 2,298