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Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,571,705 | $ 2,700,691 | $ 2,577,681
Operating income | 1,317,990 | 1,356,160 | 1,114,617
Total assets | 20,286,891 | 21,172,769 |
Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,419,018 | 2,519,235 | 2,377,066
Operating expenses | 773,479 | 757,502 | 708,616
Operating income | 1,645,539 | 1,761,733 | 1,668,450
Total assets | 17,698,696 | 18,241,515 |
Capital Expenditures | 132,281 | 171,135 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 152,687 | 181,456 | 200,615
Operating expenses | 49,081 | 55,482 | 78,533
Operating income | 103,606 | 125,974 | 122,082
Total assets | 2,588,195 | 2,931,254 |
Capital Expenditures | 3,698 | 7,288 |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,571,705 | 2,700,691 | 2,577,681
Operating expenses | 822,560 | 812,984 | 787,149
Operating income | 1,749,145 | 1,887,707 | 1,790,532
Total assets | 20,286,891 | 21,172,769 |
Capital Expenditures | 135,979 | 178,423 |
Other markets | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 17,605 | 18,215 | 1,940
Operating expenses | 4,858 | 4,713 | 658
Operating income | 12,747 | 13,502 | 1,282
Los Angeles | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 468,450 | 485,084 | 451,592
Operating expenses | 145,342 | 144,314 | 129,455
Operating income | 323,108 | 340,770 | 322,137
Total assets | 3,007,621 | 3,110,659 |
Capital Expenditures | 22,817 | 32,611 |
Subtotal - Southern California | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 648,423 | 663,869 | 644,761
Operating expenses | 188,063 | 186,562 | 177,947
Operating income | 460,360 | 477,307 | 466,814
Total assets | 3,639,057 | 3,767,255 |
Capital Expenditures | 33,507 | 45,834 |
Orange County | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 105,236 | 105,087 | 101,198
Operating expenses | 24,545 | 24,359 | 24,468
Operating income | 80,691 | 80,728 | 76,730
Total assets | 389,007 | 404,545 |
Capital Expenditures | 7,260 | 9,276 |
San Diego | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 74,737 | 73,698 | 91,971
Operating expenses | 18,176 | 17,889 | 24,024
Operating income | 56,561 | 55,809 | 67,947
Total assets | 242,429 | 252,051 |
Capital Expenditures | 3,430 | 3,947 |
Washington DC | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 389,533 | 394,171 | 403,761
Operating expenses | 120,533 | 119,419 | 123,345
Operating income | 269,000 | 274,752 | 280,416
Total assets | 3,066,702 | 3,174,721 |
Capital Expenditures | 23,626 | 22,409 |
New York | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 426,016 | 464,270 | 444,112
Operating expenses | 198,228 | 191,514 | 178,055
Operating income | 227,788 | 272,756 | 266,057
Total assets | 3,950,286 | 4,004,078 |
Capital Expenditures | 25,609 | 26,976 |
San Francisco | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 451,724 | 473,102 | 463,492
Operating expenses | 119,183 | 115,702 | 112,331
Operating income | 332,541 | 357,400 | 351,161
Total assets | 3,233,901 | 3,345,882 |
Capital Expenditures | 18,983 | 25,925 |
Boston | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 240,158 | 253,297 | 218,778
Operating expenses | 71,611 | 70,875 | 60,409
Operating income | 168,547 | 182,422 | 158,369
Total assets | 1,758,665 | 1,822,373 |
Capital Expenditures | 18,367 | 27,267 |
Seattle | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 245,559 | 252,311 | 200,222
Operating expenses | 71,003 | 68,717 | 55,871
Operating income | 174,556 | 183,594 | 144,351
Total assets | 1,802,952 | 1,871,232 |
Capital Expenditures | 11,372 | 22,023 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 116,103 | 58,751 | 103,688
Operating expenses | 35,952 | 17,702 | 36,874
Operating income | 80,151 | 41,049 | 66,814
Total assets | 1,664,892 | 1,681,367 |
Capital Expenditures | 2,627 | 1,864 |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 36,584 | 122,705 | 96,927
Operating expenses | 13,129 | 37,780 | 41,659
Operating income | 23,455 | 84,925 | $ 55,268
Total assets | 923,303 | 1,249,887 |
Capital Expenditures | 1,071 | 5,424 |
Denver | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 247,133 | 255,974 |
Capital Expenditures | $ 817 | $ 701 |

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