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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,463,997 | $ 2,571,705 | $ 2,700,691
Operating income | 1,675,841 | 1,317,990 | 1,356,160
Total Assets | 21,169,241 | 20,286,891 |
Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,342,257 | 2,425,025 | 2,519,235
Operating expenses | 803,995 | 780,381 | 757,502
Operating income | 1,538,262 | 1,644,644 | 1,761,733
Total Assets | 17,810,840 | 18,433,017 |
Capital Expenditures | 147,388 | 131,238 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 121,740 | 146,680 | 181,456
Operating expenses | 46,642 | 42,179 | 55,482
Operating income | 75,098 | 104,501 | 125,974
Total Assets | 3,358,401 | 1,853,874 |
Capital Expenditures | 3,631 | 4,741 |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,463,997 | 2,571,705 | 2,700,691
Operating expenses | 850,637 | 822,560 | 812,984
Operating income | 1,613,360 | 1,749,145 | 1,887,707
Total Assets | 21,169,241 | 20,286,891 |
Capital Expenditures | 151,019 | 135,979 |
Other markets | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 39,084 | 37,917 | 18,215
Operating expenses | 11,209 | 11,040 | 4,713
Operating income | 27,875 | 26,877 | 13,502
Los Angeles | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 447,094 | 444,129 | 485,084
Operating expenses | 141,636 | 140,469 | 144,314
Operating income | 305,458 | 303,660 | 340,770
Total Assets | 2,792,948 | 2,905,404 |
Capital Expenditures | 21,507 | 21,537 |
Subtotal - Southern California | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 635,230 | 624,102 | 663,869
Operating expenses | 185,018 | 183,190 | 186,562
Operating income | 450,212 | 440,912 | 477,307
Total Assets | 3,396,356 | 3,536,840 |
Capital Expenditures | 30,053 | 32,227 |
Orange County | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 109,427 | 105,236 | 105,087
Operating expenses | 24,986 | 24,545 | 24,359
Operating income | 84,441 | 80,691 | 80,728
Total Assets | 371,063 | 389,007 |
Capital Expenditures | 5,647 | 7,260 |
San Diego | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 78,709 | 74,737 | 73,698
Operating expenses | 18,396 | 18,176 | 17,889
Operating income | 60,313 | 56,561 | 55,809
Total Assets | 232,345 | 242,429 |
Capital Expenditures | 2,899 | 3,430 |
Washington D.C. | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 393,374 | 405,571 | 394,171
Operating expenses | 130,445 | 125,353 | 119,419
Operating income | 262,929 | 280,218 | 274,752
Total Assets | 3,177,162 | 3,291,760 |
Capital Expenditures | 27,148 | 23,637 |
New York | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 405,830 | 424,534 | 464,270
Operating expenses | 202,954 | 197,740 | 191,514
Operating income | 202,876 | 226,794 | 272,756
Total Assets | 3,897,202 | 4,000,355 |
Capital Expenditures | 29,623 | 25,716 |
San Francisco | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 391,022 | 435,371 | 473,102
Operating expenses | 121,134 | 117,085 | 115,702
Operating income | 269,888 | 318,286 | 357,400
Total Assets | 3,195,089 | 3,310,083 |
Capital Expenditures | 22,416 | 18,091 |
Boston | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 232,233 | 240,158 | 253,297
Operating expenses | 75,698 | 71,611 | 70,875
Operating income | 156,535 | 168,547 | 182,422
Total Assets | 1,694,432 | 1,758,665 |
Capital Expenditures | 21,095 | 18,367 |
Seattle | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 245,484 | 257,372 | 252,311
Operating expenses | 77,537 | 74,362 | 68,717
Operating income | 167,947 | 183,010 | 183,594
Total Assets | 1,958,145 | 2,023,183 |
Capital Expenditures | 15,038 | 11,621 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 51,604 | 11,791 | 58,751
Operating expenses | 21,296 | 2,706 | 17,702
Operating income | 30,308 | 9,085 | 41,049
Total Assets | 2,512,611 | 671,216 |
Capital Expenditures | 1,704 | 73 |
Other [Member] | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 70,136 | 134,889 | 122,705
Operating expenses | 25,346 | 39,473 | 37,780
Operating income | 44,790 | 95,416 | $ 84,925
Total Assets | 845,790 | 1,182,658 |
Capital Expenditures | 1,927 | 4,668 |
Denver | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 492,454 | 512,131 |
Capital Expenditures | $ 2,015 | $ 1,579 |

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