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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | $ 653,532 | $ 669,374 | $ 1,335,837 | $ 1,331,676 |
Operating income | 356,889 | 369,117 | 778,974 | 578,894 |
Total Assets | 20,714,951 |  | 20,714,951 |  | $ 21,172,769
Capital Expenditures |  |  | 61,265 |  |
Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 623,275 | 637,915 | 1,260,825 | 1,258,261 |
Operating expenses | 190,021 | 190,277 | 386,742 | 382,188 |
Operating income | 433,254 | 447,638 | 874,083 | 876,073 |
Total Assets | 18,134,597 |  | 18,134,597 |  |
Capital Expenditures |  |  | 59,634 |  |
Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 30,257 | 31,459 | 75,012 | 73,415 |
Operating expenses | 9,469 | 9,630 | 26,296 | 24,231 |
Operating income | 20,788 | 21,829 | 48,716 | 49,184 |
Total Assets | 2,580,354 |  | 2,580,354 |  |
Capital Expenditures |  |  | 1,631 |  |
Same Store, Non-same Store and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 653,532 | 669,374 | 1,335,837 | 1,331,676 |
Operating expenses | 199,490 | 199,907 | 413,038 | 406,419 |
Operating income | 454,042 | 469,467 | 922,799 | 925,257 |
Los Angeles | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 117,994 | 121,216 | 239,914 | 240,751 |
Operating expenses | 35,013 | 35,688 | 71,930 | 72,145 |
Operating income | 82,981 | 85,528 | 167,984 | 168,606 |
Total Assets | 3,064,404 |  | 3,064,404 |  |
Capital Expenditures |  |  | 13,070 |  |
Orange County | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 26,318 | 26,058 | 53,013 | 51,887 |
Operating expenses | 5,953 | 5,966 | 12,167 | 12,142 |
Operating income | 20,365 | 20,092 | 40,846 | 39,745 |
Total Assets | 397,148 |  | 397,148 |  |
Capital Expenditures |  |  | 3,458 |  |
San Diego | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 23,706 | 23,720 | 47,848 | 47,023 |
Operating expenses | 6,100 | 5,978 | 12,417 | 12,126 |
Operating income | 17,606 | 17,742 | 35,431 | 34,897 |
Total Assets | 382,082 |  | 382,082 |  |
Capital Expenditures |  |  | 1,993 |  |
Subtotal - Southern California | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 168,018 | 170,994 | 340,775 | 339,661 |
Operating expenses | 47,066 | 47,632 | 96,514 | 96,413 |
Operating income | 120,952 | 123,362 | 244,261 | 243,248 |
Total Assets | 3,843,634 |  | 3,843,634 |  |
Capital Expenditures |  |  | 18,521 |  |
San Francisco | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 116,303 | 118,044 | 236,580 | 234,514 |
Operating expenses | 29,045 | 28,528 | 59,313 | 57,629 |
Operating income | 87,258 | 89,516 | 177,267 | 176,885 |
Total Assets | 3,288,932 |  | 3,288,932 |  |
Capital Expenditures |  |  | 6,940 |  |
Washington DC | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 97,527 | 98,571 | 196,601 | 195,453 |
Operating expenses | 28,680 | 29,409 | 59,331 | 59,389 |
Operating income | 68,847 | 69,162 | 137,270 | 136,064 |
Total Assets | 3,120,074 |  | 3,120,074 |  |
Capital Expenditures |  |  | 10,534 |  |
New York | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 111,949 | 117,457 | 227,179 | 230,808 |
Operating expenses | 48,130 | 47,626 | 98,581 | 96,067 |
Operating income | 63,819 | 69,831 | 128,598 | 134,741 |
Total Assets | 4,001,050 |  | 4,001,050 |  |
Capital Expenditures |  |  | 10,429 |  |
Boston | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 59,990 | 62,751 | 123,673 | 124,671 |
Operating expenses | 16,984 | 17,398 | 35,144 | 35,639 |
Operating income | 43,006 | 45,353 | 88,529 | 89,032 |
Total Assets | 1,790,996 |  | 1,790,996 |  |
Capital Expenditures |  |  | 8,631 |  |
Seattle | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 63,378 | 63,695 | 127,073 | 124,029 |
Operating expenses | 18,383 | 17,853 | 35,440 | 34,634 |
Operating income | 44,995 | 45,842 | 91,633 | 89,395 |
Total Assets | 1,838,484 |  | 1,838,484 |  |
Capital Expenditures |  |  | 4,334 |  |
Denver | Same Store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 6,110 | 6,403 | 8,944 | 9,125 |
Operating expenses | 1,733 | 1,831 | 2,419 | 2,417 |
Operating income | 4,377 | 4,572 | 6,525 | 6,708 |
Total Assets | 251,427 |  | 251,427 |  |
Capital Expenditures |  |  | 245 |  |
Non-same store | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 24,631 | 4,000 | 58,629 | 14,374 |
Operating expenses | 7,212 | 1,124 | 17,748 | 4,423 |
Operating income | 17,419 | 2,876 | 40,881 | 9,951 |
Total Assets | 1,642,289 |  | 1,642,289 |  |
Capital Expenditures |  |  | 1,129 |  |
Other | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 5,626 | 27,459 | 16,383 | 59,041 |
Operating expenses | 2,257 | 8,506 | 8,548 | 19,808 |
Operating income | 3,369 | $ 18,953 | 7,835 | $ 39,233 |
Total Assets | $ 938,065 |  | 938,065 |  |
Capital Expenditures |  |  | $ 502 |  |

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