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Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | $ 623,206 | $ 622,433 | $ 1,818,867 | $ 1,958,270 |
Operating income | 521,554 | 182,410 | 1,033,958 | 961,384 |
Total Assets | 20,663,015 |  | 20,663,015 |  | $ 20,286,891
Capital Expenditures |  |  | 107,706 |  |
Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 601,852 | 600,252 | 1,758,176 | 1,870,199 |
Operating expenses | 206,583 | 202,164 | 612,705 | 593,502 |
Operating income | 395,269 | 398,088 | 1,145,471 | 1,276,697 |
Total Assets | 18,156,651 |  | 18,156,651 |  |
Capital Expenditures |  |  | 106,130 |  |
Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 21,354 | 22,181 | 60,691 | 88,071 |
Operating expenses | 6,787 | 6,174 | 26,336 | 27,874 |
Operating income | 14,567 | 16,007 | 34,355 | 60,197 |
Total Assets | 2,506,364 |  | 2,506,364 |  |
Capital Expenditures |  |  | 1,576 |  |
Same Store, Non-same Store and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 623,206 | 622,433 | 1,818,867 | 1,958,270 |
Operating expenses | 213,370 | 208,338 | 639,041 | 621,376 |
Operating income | 409,836 | 414,095 | 1,179,826 | 1,336,894 |
Los Angeles | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 117,542 | 112,201 | 337,153 | 346,599 |
Operating expenses | 36,929 | 36,783 | 109,997 | 108,594 |
Operating income | 80,613 | 75,418 | 227,156 | 238,005 |
Total Assets | 2,926,617 |  | 2,926,617 |  |
Capital Expenditures |  |  | 13,959 |  |
Orange County | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 28,264 | 26,229 | 80,773 | 79,241 |
Operating expenses | 6,480 | 6,457 | 18,937 | 18,539 |
Operating income | 21,784 | 19,772 | 61,836 | 60,702 |
Total Assets | 375,365 |  | 375,365 |  |
Capital Expenditures |  |  | 4,124 |  |
San Diego | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 20,282 | 18,637 | 58,211 | 56,001 |
Operating expenses | 4,735 | 4,652 | 13,920 | 13,684 |
Operating income | 15,547 | 13,985 | 44,291 | 42,317 |
Total Assets | 234,733 |  | 234,733 |  |
Capital Expenditures |  |  | 2,060 |  |
Subtotal - Southern California | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 166,088 | 157,067 | 476,137 | 481,841 |
Operating expenses | 48,144 | 47,892 | 142,854 | 140,817 |
Operating income | 117,944 | 109,175 | 333,283 | 341,024 |
Total Assets | 3,536,715 |  | 3,536,715 |  |
Capital Expenditures |  |  | 20,143 |  |
San Francisco | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 102,166 | 109,908 | 302,043 | 346,089 |
Operating expenses | 31,542 | 30,913 | 93,983 | 90,849 |
Operating income | 70,624 | 78,995 | 208,060 | 255,240 |
Total Assets | 3,264,017 |  | 3,264,017 |  |
Capital Expenditures |  |  | 15,853 |  |
Washington D.C. | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 100,019 | 103,160 | 298,165 | 311,119 |
Operating expenses | 34,397 | 32,979 | 99,369 | 95,799 |
Operating income | 65,622 | 70,181 | 198,796 | 215,320 |
Total Assets | 3,270,172 |  | 3,270,172 |  |
Capital Expenditures |  |  | 20,392 |  |
New York | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 103,015 | 98,333 | 299,320 | 324,866 |
Operating expenses | 49,939 | 49,915 | 152,228 | 148,145 |
Operating income | 53,076 | 48,418 | 147,092 | 176,721 |
Total Assets | 3,902,715 |  | 3,902,715 |  |
Capital Expenditures |  |  | 22,641 |  |
Boston | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 58,864 | 59,527 | 171,871 | 182,502 |
Operating expenses | 19,504 | 18,601 | 57,041 | 53,727 |
Operating income | 39,360 | 40,926 | 114,830 | 128,775 |
Total Assets | 1,710,489 |  | 1,710,489 |  |
Capital Expenditures |  |  | 15,766 |  |
Seattle | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 61,888 | 62,748 | 181,908 | 195,198 |
Operating expenses | 20,117 | 18,972 | 58,616 | 55,845 |
Operating income | 41,771 | 43,776 | 123,292 | 139,353 |
Total Assets | 1,975,574 |  | 1,975,574 |  |
Capital Expenditures |  |  | 10,234 |  |
Denver | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 9,812 | 9,509 | 28,732 | 28,584 |
Operating expenses | 2,940 | 2,892 | 8,614 | 8,320 |
Operating income | 6,872 | 6,617 | 20,118 | 20,264 |
Total Assets | 496,969 |  | 496,969 |  |
Capital Expenditures |  |  | 1,101 |  |
Non-same store | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 16,563 | 2,481 | 28,581 | 11,440 |
Operating expenses | 6,777 | 539 | 10,916 | 2,534 |
Operating income | 9,786 | 1,942 | 17,665 | 8,906 |
Total Assets | 1,484,091 |  | 1,484,091 |  |
Capital Expenditures |  |  | 659 |  |
Other | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 4,791 | 19,700 | 32,110 | 76,631 |
Operating expenses | 10 | 5,635 | 15,420 | 25,340 |
Operating income | 4,781 | $ 14,065 | 16,690 | $ 51,291 |
Total Assets | $ 1,022,273 |  | 1,022,273 |  |
Capital Expenditures |  |  | $ 917 |  |

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