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Segment Reporting (Details 3) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting        
Total revenue $ 561,743 $ 576,405 $ 1,112,879 $ 1,178,056
NOI 368,914 388,128 729,259 798,568
Gross real estate 24,051,801 23,117,676 24,051,801 23,117,676
Operating Segments | Established        
Segment Reporting        
Total revenue 500,641 522,697 997,140 1,068,983
NOI 337,322 368,478 673,190 758,873
Gross real estate 19,965,496 19,846,708 19,965,496 19,846,708
Operating Segments | Established | New England        
Segment Reporting        
Total revenue 74,259 77,240 147,577 156,085
NOI 47,895 52,030 94,163 104,299
Gross real estate 2,772,638 2,751,535 2,772,638 2,751,535
Operating Segments | Established | Metro NY/NJ        
Segment Reporting        
Total revenue 105,355 106,452 210,304 219,266
NOI 70,944 73,858 142,584 153,511
Gross real estate 4,114,155 4,097,021 4,114,155 4,097,021
Operating Segments | Established | Mid-Atlantic        
Segment Reporting        
Total revenue 82,232 84,634 163,460 172,954
NOI 54,823 59,217 110,083 122,975
Gross real estate 3,485,698 3,462,890 3,485,698 3,462,890
Operating Segments | Established | Southeast Florida        
Segment Reporting        
Total revenue 7,706 7,364 14,948 14,868
NOI 4,557 4,298 8,746 8,423
Gross real estate 395,009 393,329 395,009 393,329
Operating Segments | Established | Denver, Colorado        
Segment Reporting        
Total revenue 5,853 5,166 11,505 10,335
NOI 3,935 3,326 7,954 6,666
Gross real estate 319,994 318,833 319,994 318,833
Operating Segments | Established | Pacific Northwest        
Segment Reporting        
Total revenue 26,935 28,105 53,548 57,263
NOI 18,298 19,932 36,192 41,065
Gross real estate 1,054,701 1,049,913 1,054,701 1,049,913
Operating Segments | Established | Northern California        
Segment Reporting        
Total revenue 89,591 103,867 179,997 210,744
NOI 63,506 79,384 127,569 161,263
Gross real estate 3,450,054 3,427,805 3,450,054 3,427,805
Operating Segments | Established | Southern California        
Segment Reporting        
Total revenue 108,710 109,869 215,801 227,468
NOI 73,364 76,433 145,899 160,671
Gross real estate 4,373,247 4,345,382 4,373,247 4,345,382
Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 29,499 24,642 56,264 49,673
NOI 19,123 16,055 36,049 32,552
Gross real estate 1,338,844 1,209,541 1,338,844 1,209,541
Operating Segments | Development / Redevelopment        
Segment Reporting        
Total revenue 23,076 7,368 40,483 14,181
NOI 12,469 3,595 20,020 7,143
Gross real estate 2,324,779 1,614,237 2,324,779 1,614,237
Operating Segments | Disposals [Member]        
Segment Reporting        
Gross real estate   672,125   672,125
Land Held for Future Development        
Segment Reporting        
Gross real estate 100,106 39,829 100,106 39,829
Non-allocated        
Segment Reporting        
Total revenue 808 299 1,685 690
Gross real estate 322,576 407,361 322,576 407,361
Continuing Operations        
Segment Reporting        
Total revenue 554,024 555,006 1,095,572 1,133,527
Continuing Operations | Operating Segments | Established        
Segment Reporting        
Total revenue 500,641 522,697 997,140 1,068,983
Continuing Operations | Operating Segments | Other Stabilized        
Segment Reporting        
Total revenue 29,499 24,642 56,264 49,673
Continuing Operations | Non-allocated        
Segment Reporting        
Total revenue $ 808 $ 299 $ 1,685 $ 690