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Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Rental income $ 748,348 $ 724,067 $ 2,213,329 $ 2,146,464  
Operating expenses 241,175 231,945 716,801 704,044  
NOI 507,173 492,122 1,496,528 1,442,420  
Total Assets 20,925,821   20,925,821   $ 20,034,564
Capital Expenditures     230,107    
Same Store          
Segment Reporting Information [Line Items]          
Rental income 722,308 703,370 2,151,275 2,083,707  
Operating expenses 230,098 223,047 684,342 668,633  
NOI 492,210 480,323 1,466,933 1,415,074  
Total Assets 18,053,026   18,053,026    
Capital Expenditures     213,845    
Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 26,040 20,697 62,054 62,757  
Operating expenses 11,077 8,898 32,459 35,411  
NOI 14,963 11,799 29,595 27,346  
Total Assets 2,872,795   2,872,795    
Capital Expenditures     16,262    
Los Angeles | Same Store          
Segment Reporting Information [Line Items]          
Rental income 120,211 118,812 359,597 348,595  
Operating expenses 37,670 36,343 111,273 108,917  
NOI 82,541 82,469 248,324 239,678  
Total Assets 2,441,079   2,441,079    
Capital Expenditures     39,778    
Orange County | Same Store          
Segment Reporting Information [Line Items]          
Rental income 31,488 30,663 93,760 90,080  
Operating expenses 7,248 6,792 21,113 20,188  
NOI 24,240 23,871 72,647 69,892  
Total Assets 334,057   334,057    
Capital Expenditures     12,059    
San Diego | Same Store          
Segment Reporting Information [Line Items]          
Rental income 25,969 25,258 77,784 74,183  
Operating expenses 6,071 5,820 17,731 17,371  
NOI 19,898 19,438 60,053 56,812  
Total Assets 335,471   335,471    
Capital Expenditures     12,061    
Subtotal - Southern California | Same Store          
Segment Reporting Information [Line Items]          
Rental income 177,668 174,733 531,141 512,858  
Operating expenses 50,989 48,955 150,117 146,476  
NOI 126,679 125,778 381,024 366,382  
Total Assets 3,110,607   3,110,607    
Capital Expenditures     63,898    
Washington D.C. | Same Store          
Segment Reporting Information [Line Items]          
Rental income 117,306 112,681 347,229 331,425  
Operating expenses 38,351 35,616 110,104 107,050  
NOI 78,955 77,065 237,125 224,375  
Total Assets 2,980,055   2,980,055    
Capital Expenditures     35,160    
San Francisco | Same Store          
Segment Reporting Information [Line Items]          
Rental income 108,957 107,808 325,999 321,310  
Operating expenses 33,313 32,769 99,012 98,504  
NOI 75,644 75,039 226,987 222,806  
Total Assets 2,996,799   2,996,799    
Capital Expenditures     42,555    
New York | Same Store          
Segment Reporting Information [Line Items]          
Rental income 123,506 118,327 369,642 356,157  
Operating expenses 50,011 48,055 151,331 145,192  
NOI 73,495 70,272 218,311 210,965  
Total Assets 3,241,250   3,241,250    
Capital Expenditures     19,683    
Boston | Same Store          
Segment Reporting Information [Line Items]          
Rental income 81,941 78,562 244,474 234,291  
Operating expenses 23,156 22,875 69,882 69,072  
NOI 58,785 55,687 174,592 165,219  
Total Assets 2,028,747   2,028,747    
Capital Expenditures     21,954    
Seattle | Same Store          
Segment Reporting Information [Line Items]          
Rental income 75,032 72,778 223,656 218,574  
Operating expenses 21,907 20,883 65,197 62,055  
NOI 53,125 51,895 158,459 156,519  
Total Assets 2,023,139   2,023,139    
Capital Expenditures     22,405    
Denver | Same Store          
Segment Reporting Information [Line Items]          
Rental income 19,649 19,802 53,522 53,324  
Operating expenses 6,062 5,937 16,190 16,161  
NOI 13,587 13,865 37,332 37,163  
Total Assets 799,928   799,928    
Capital Expenditures     3,036    
Other Expansion Markets | Same Store          
Segment Reporting Information [Line Items]          
Rental income 18,249 18,679 55,612 55,768  
Operating expenses 6,309 7,957 22,509 24,123  
NOI 11,940 10,722 33,103 31,645  
Total Assets 872,501   872,501    
Capital Expenditures     5,154    
Non-same store | Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 25,391 8,059 54,874 22,406  
Operating expenses 9,371 4,099 22,230 10,893  
NOI 16,020 3,960 32,644 11,513  
Total Assets 1,998,651   1,998,651    
Capital Expenditures     15,724    
Other | Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 649 12,638 7,180 40,351  
Operating expenses 1,706 4,799 10,229 24,518  
NOI (1,057) $ 7,839 (3,049) $ 15,833  
Total Assets $ 874,144   874,144    
Capital Expenditures     $ 538