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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Rental income $ 687,030 $ 598,059 $ 1,340,378 $ 1,195,661  
Operating income 309,934 376,844 459,672 512,404  
Total Assets 20,574,345   20,574,345   $ 21,169,241
Same Store          
Segment Reporting Information [Line Items]          
Rental income 645,797 568,365 1,258,233 1,136,537  
Operating expenses 201,365 195,328 408,849 397,762  
Operating income 444,432 373,037 849,384 738,775  
Total Assets 17,572,767   17,572,767    
Capital Expenditures     77,137    
Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 41,233 29,694 82,145 59,124  
Operating expenses 16,840 9,819 34,918 27,909  
Operating income 24,393 19,875 47,227 31,215  
Total Assets 3,001,578   3,001,578    
Capital Expenditures     6,167    
Same Store, Non-same Store and Other          
Segment Reporting Information [Line Items]          
Rental income 687,030 598,059 1,340,378 1,195,661  
Operating expenses 218,205 205,147 443,767 425,671  
Operating income 468,825 392,912 896,611 769,990  
Total Assets 20,574,345   20,574,345    
Capital Expenditures     83,304    
Los Angeles | Same Store          
Segment Reporting Information [Line Items]          
Rental income 125,767 106,873 241,119 213,291  
Operating expenses 35,692 34,509 72,466 70,202  
Operating income 90,075 72,364 168,653 143,089  
Total Assets 2,748,850   2,748,850    
Capital Expenditures     14,728    
Orange County | Same Store          
Segment Reporting Information [Line Items]          
Rental income 31,252 26,669 60,018 52,510  
Operating expenses 6,381 6,096 12,805 12,411  
Operating income 24,871 20,573 47,213 40,099  
Total Assets 362,679   362,679    
Capital Expenditures     2,643    
San Diego | Same Store          
Segment Reporting Information [Line Items]          
Rental income 21,470 19,188 42,410 37,928  
Operating expenses 4,626 4,543 9,555 9,176  
Operating income 16,844 14,645 32,855 28,752  
Total Assets 228,219   228,219    
Capital Expenditures     1,828    
Subtotal - Southern California | Same Store          
Segment Reporting Information [Line Items]          
Rental income 178,489 152,730 343,547 303,729  
Operating expenses 46,699 45,148 94,826 91,789  
Operating income 131,790 107,582 248,721 211,940  
Total Assets 3,339,748   3,339,748    
Capital Expenditures     19,199    
San Francisco | Same Store          
Segment Reporting Information [Line Items]          
Rental income 105,402 93,784 206,018 188,762  
Operating expenses 30,050 28,982 61,588 59,386  
Operating income 75,352 64,802 144,430 129,376  
Total Assets 3,114,937   3,114,937    
Capital Expenditures     13,003    
Washington D.C. | Same Store          
Segment Reporting Information [Line Items]          
Rental income 103,022 97,423 203,494 194,911  
Operating expenses 34,172 31,701 68,073 64,309  
Operating income 68,850 65,722 135,421 130,602  
Total Assets 3,120,459   3,120,459    
Capital Expenditures     13,391    
New York | Same Store          
Segment Reporting Information [Line Items]          
Rental income 112,865 94,473 218,855 188,676  
Operating expenses 48,559 48,258 99,705 98,235  
Operating income 64,306 46,215 119,150 90,441  
Total Assets 3,700,473   3,700,473    
Capital Expenditures     12,422    
Seattle | Same Store          
Segment Reporting Information [Line Items]          
Rental income 70,128 62,603 137,255 126,450  
Operating expenses 19,512 19,999 38,837 40,434  
Operating income 50,616 42,604 98,418 86,016  
Total Assets 2,106,727   2,106,727    
Capital Expenditures     8,761    
Boston | Same Store          
Segment Reporting Information [Line Items]          
Rental income 65,066 57,777 127,660 115,089  
Operating expenses 19,443 18,530 39,881 38,077  
Operating income 45,623 39,247 87,779 77,012  
Total Assets 1,708,006   1,708,006    
Capital Expenditures     9,799    
Denver | Same Store          
Segment Reporting Information [Line Items]          
Rental income 10,825 9,575 21,404 18,920  
Operating expenses 2,930 2,710 5,939 5,532  
Operating income 7,895 6,865 15,465 13,388  
Total Assets 482,417   482,417    
Capital Expenditures     562    
Non-same store | Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 40,501 3,436 77,019 5,186  
Operating expenses 15,646 1,660 31,614 2,299  
Operating income 24,855 1,776 45,405 2,887  
Total Assets 2,421,668   2,421,668    
Capital Expenditures     6,053    
Other | Non-same store/other          
Segment Reporting Information [Line Items]          
Rental income 732 26,258 5,126 53,938  
Operating expenses 1,194 8,159 3,304 25,610  
Operating income (462) $ 18,099 1,822 $ 28,328  
Total Assets $ 579,910   579,910    
Capital Expenditures     $ 114