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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,700,691 | $ 2,577,681 | $ 2,470,689
Operating income | 1,356,544 | 1,115,370 | 1,004,528
Total assets | 21,172,769 | 20,394,209 |
Capital Expenditures | 178,423 | 188,501 |
Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,453,259 | 2,377,066 | 2,311,240
Operating expenses | 734,553 | 708,616 | 681,198
Operating income | 1,718,706 | 1,668,450 | 1,630,042
Total assets | 17,015,372 | 17,328,625 |
Capital Expenditures | 165,785 | 176,145 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 247,432 | 200,615 | 159,449
Operating expenses | 78,431 | 78,533 | 59,578
Operating income | 169,001 | 122,082 | 99,871
Total assets | 4,157,397 | 3,065,584 |
Capital Expenditures | 12,638 | 12,356 |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,700,691 | 2,577,681 | 2,470,689
Operating expenses | 812,984 | 787,149 | 740,776
Operating income | 1,887,707 | 1,790,532 | 1,729,913
Other markets | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,094 | 1,940 | 1,839
Operating expenses | 714 | 658 | 652
Operating income | 1,380 | 1,282 | 1,187
Total assets | 12,931 | 12,781 |
Capital Expenditures | 194 | 163 |
Los Angeles | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 468,517 | 451,592 | 402,192
Operating expenses | 136,096 | 129,455 | 114,055
Operating income | 332,421 | 322,137 | 288,137
Total assets | 2,975,420 | 2,958,361 |
Capital Expenditures | 31,738 | 28,574 |
Subtotal - Southern California | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 668,646 | 644,761 | 579,226
Operating expenses | 185,139 | 177,947 | 158,672
Operating income | 483,507 | 466,814 | 420,554
Total assets | 3,769,502 | 3,781,851 |
Capital Expenditures | 45,478 | 41,313 |
Orange County | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 105,087 | 101,198 | 88,527
Operating expenses | 24,407 | 24,468 | 21,544
Operating income | 80,680 | 76,730 | 66,983
Total assets | 404,545 | 418,041 |
Capital Expenditures | 9,276 | 8,214 |
San Diego | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 95,042 | 91,971 | 88,507
Operating expenses | 24,636 | 24,024 | 23,073
Operating income | 70,406 | 67,947 | 65,434
Total assets | 389,537 | 405,449 |
Capital Expenditures | 4,464 | 4,525 |
Washington DC | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 413,006 | 403,761 | 430,060
Operating expenses | 125,688 | 123,345 | 129,720
Operating income | 287,318 | 280,416 | 300,340
Total assets | 3,370,750 | 3,484,045 |
Capital Expenditures | 23,015 | 26,981 |
New York | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 454,448 | 444,112 | 454,945
Operating expenses | 188,784 | 178,055 | 170,064
Operating income | 265,664 | 266,057 | 284,881
Total assets | 3,866,500 | 3,878,580 |
Capital Expenditures | 25,132 | 23,126 |
San Francisco | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 480,499 | 463,492 | 430,501
Operating expenses | 116,036 | 112,331 | 108,689
Operating income | 364,463 | 351,161 | 321,812
Total assets | 3,238,884 | 3,325,595 |
Capital Expenditures | 28,153 | 42,497 |
Boston | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 227,547 | 218,778 | 223,595
Operating expenses | 62,176 | 60,409 | 60,931
Operating income | 165,371 | 158,369 | 162,664
Total assets | 1,464,196 | 1,514,814 |
Capital Expenditures | 23,823 | 24,000 |
Seattle | Same Store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 207,019 | 200,222 | 191,074
Operating expenses | 56,016 | 55,871 | 52,470
Operating income | 151,003 | 144,351 | 138,604
Total assets | 1,292,609 | 1,330,959 |
Capital Expenditures | 19,990 | 18,065 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 196,476 | 103,688 | 95,016
Operating expenses | 62,591 | 36,874 | 30,742
Operating income | 133,885 | 66,814 | 64,274
Total assets | 3,447,497 | 1,990,102 |
Capital Expenditures | 10,788 | 5,934 |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 50,956 | 96,927 | 64,433
Operating expenses | 15,840 | 41,659 | 28,836
Operating income | 35,116 | 55,268 | $ 35,597
Total assets | 709,900 | 1,075,482 |
Capital Expenditures | $ 1,850 | $ 6,422 |

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