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Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,873,964 | $ 2,735,180 | $ 2,463,997
Operating expenses | 926,689 | 872,277 | 850,637
Operating income | 1,947,275 | 1,862,903 | 1,613,360
Operating income | 1,160,585 | 1,116,046 | 1,675,841
Total Assets | 20,034,564 | 20,218,262 |
Capital Expenditures | 319,342 | 221,086 |
Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,754,711 | 2,609,766 | 2,291,604
Operating expenses | 873,448 | 837,602 | 774,504
Operating income | 1,881,263 | 1,772,164 | 1,517,100
Total Assets | 17,790,858 | 18,314,739 |
Capital Expenditures | 282,845 | 204,135 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 119,253 | 125,414 | 172,393
Operating expenses | 53,241 | 34,675 | 76,133
Operating income | 66,012 | 90,739 | 96,260
Total Assets | 2,243,706 | 1,903,523 |
Capital Expenditures | 36,497 | 16,951 |
Los Angeles | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 466,980 | 450,635 | 431,954
Operating expenses | 143,983 | 132,858 | 132,274
Operating income | 322,997 | 317,777 | 299,680
Total Assets | 2,489,180 | 2,549,606 |
Capital Expenditures | 54,688 | 35,057 |
Orange County | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 130,343 | 122,660 | 109,427
Operating expenses | 28,699 | 26,511 | 24,986
Operating income | 101,644 | 96,149 | 84,441
Total Assets | 343,219 | 356,396 |
Capital Expenditures | 9,888 | 7,885 |
San Diego | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 92,691 | 86,728 | 78,709
Operating expenses | 20,602 | 19,506 | 18,395
Operating income | 72,089 | 67,222 | 60,314
Total Assets | 231,549 | 228,471 |
Capital Expenditures | 17,137 | 8,798 |
Subtotal - Southern California | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 690,014 | 660,023 | 620,090
Operating expenses | 193,284 | 178,875 | 175,655
Operating income | 496,730 | 481,148 | 444,435
Total Assets | 3,063,948 | 3,134,473 |
Capital Expenditures | 81,713 | 51,740 |
Washington D.C. | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 441,676 | 417,210 | 389,205
Operating expenses | 140,696 | 138,570 | 129,065
Operating income | 300,980 | 278,640 | 260,140
Total Assets | 2,995,509 | 3,091,996 |
Capital Expenditures | 50,504 | 34,640 |
San Francisco | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 430,390 | 415,173 | 383,817
Operating expenses | 129,480 | 124,192 | 118,795
Operating income | 300,910 | 290,981 | 265,022
Total Assets | 2,972,476 | 3,049,771 |
Capital Expenditures | 53,963 | 33,497 |
New York | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 476,319 | 434,820 | 367,370
Operating expenses | 193,311 | 187,218 | 182,631
Operating income | 283,008 | 247,602 | 184,739
Total Assets | 3,326,831 | 3,421,373 |
Capital Expenditures | 21,908 | 21,636 |
Seattle | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 290,894 | 281,959 | 256,988
Operating expenses | 81,787 | 79,037 | 80,775
Operating income | 209,107 | 202,922 | 176,213
Total Assets | 2,075,966 | 2,141,346 |
Capital Expenditures | 34,011 | 27,935 |
Boston | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 289,423 | 270,899 | 235,050
Operating expenses | 85,579 | 82,523 | 76,374
Operating income | 203,844 | 188,376 |
Operating income |  |  | 158,676
Total Assets | 1,748,887 | 1,807,629 |
Capital Expenditures | 30,852 | 23,951 |
Denver | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 71,067 | 67,785 | 39,084
Operating expenses | 21,328 | 19,569 | 11,209
Operating income | 49,739 | 48,216 | 27,875
Total Assets | 824,264 | 857,021 |
Capital Expenditures | 4,220 | 8,561 |
Other Expansion Markets | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 64,928 | 61,897 |
Operating expenses | 27,983 | 27,618 |
Operating income | 36,945 | 34,279 |
Total Assets | 782,977 | 811,130 |
Capital Expenditures | 5,674 | 2,175 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 100,970 | 74,379 | 59,629
Operating expenses | 36,836 | 29,758 | 27,691
Operating income | 64,134 | 44,621 | 31,938
Total Assets | 1,493,139 | 1,134,000 |
Capital Expenditures | 35,615 | 15,277 |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 18,283 | 51,035 | 112,764
Operating expenses | (16,405) | 4,917 | 48,442
Operating income | 1,878 | 46,118 | $ 64,322
Total Assets | 750,567 | 769,523 |
Capital Expenditures | $ 882 | $ 1,674 |

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