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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | $ 623,951 | $ 605,856 | $ 1,840,170 | $ 1,816,960 |
Operating income | 217,786 | 209,373 | 632,707 | 632,016 |
Total Assets | 20,697,833 |  | 20,697,833 |  | $ 20,704,148
Capital Expenditures |  |  | 143,258 |  |
Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 587,142 | 574,594 | 1,685,303 | 1,647,988 |
Operating expenses | 173,844 | 171,019 | 496,232 | 482,410 |
Operating income | 413,298 | 403,575 | 1,189,071 | 1,165,578 |
Total Assets | 16,731,045 |  | 16,731,045 |  |
Capital Expenditures |  |  | 139,638 |  |
Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 36,809 | 31,262 | 154,867 | 168,972 |
Operating expenses | 14,964 | 14,540 | 63,731 | 66,232 |
Operating income | 21,845 | 16,722 | 91,136 | 102,740 |
Total Assets | 3,966,788 |  | 3,966,788 |  |
Capital Expenditures |  |  | 3,620 |  |
Same Store, Non-same Store and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 623,951 | 605,856 | 1,840,170 | 1,816,960 |
Operating expenses | 188,808 | 185,559 | 559,963 | 548,642 |
Operating income | 435,143 | 420,297 | 1,280,207 | 1,268,318 |
Other markets | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 459 | 457 | 1,384 | 1,342 |
Operating expenses | 158 | 136 | 499 | 428 |
Operating income | 301 | 321 | 885 | 914 |
Total Assets | 12,778 |  | 12,778 |  |
Capital Expenditures |  |  | 83 |  |
Los Angeles | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 102,566 | 98,542 | 296,345 | 285,463 |
Operating expenses | 27,768 | 29,362 | 83,927 | 83,459 |
Operating income | 74,798 | 69,180 | 212,418 | 202,004 |
Total Assets | 2,620,672 |  | 2,620,672 |  |
Capital Expenditures |  |  | 18,952 |  |
Orange County | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 22,427 | 21,455 | 66,081 | 63,005 |
Operating expenses | 5,500 | 5,362 | 16,355 | 15,529 |
Operating income | 16,927 | 16,093 | 49,726 | 47,476 |
Total Assets | 330,580 |  | 330,580 |  |
Capital Expenditures |  |  | 6,671 |  |
San Diego | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 22,432 | 21,516 | 66,052 | 63,171 |
Operating expenses | 5,867 | 5,740 | 17,386 | 16,884 |
Operating income | 16,565 | 15,776 | 48,666 | 46,287 |
Total Assets | 425,241 |  | 425,241 |  |
Capital Expenditures |  |  | 3,776 |  |
Subtotal - Southern California | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 147,425 | 141,513 | 428,478 | 411,639 |
Operating expenses | 39,135 | 40,464 | 117,668 | 115,872 |
Operating income | 108,290 | 101,049 | 310,810 | 295,767 |
Total Assets | 3,376,493 |  | 3,376,493 |  |
Capital Expenditures |  |  | 29,399 |  |
Washington DC | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 108,763 | 107,340 | 322,307 | 317,879 |
Operating expenses | 33,459 | 32,817 | 98,043 | 95,187 |
Operating income | 75,304 | 74,523 | 224,264 | 222,692 |
Total Assets | 3,836,992 |  | 3,836,992 |  |
Capital Expenditures |  |  | 26,308 |  |
New York | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 125,351 | 124,709 | 345,656 | 345,434 |
Operating expenses | 46,219 | 44,223 | 126,226 | 120,390 |
Operating income | 79,132 | 80,486 | 219,430 | 225,044 |
Total Assets | 4,181,890 |  | 4,181,890 |  |
Capital Expenditures |  |  | 23,547 |  |
San Francisco | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 98,805 | 97,259 | 283,654 | 277,666 |
Operating expenses | 24,875 | 24,487 | 69,053 | 68,246 |
Operating income | 73,930 | 72,772 | 214,601 | 209,420 |
Total Assets | 2,480,069 |  | 2,480,069 |  |
Capital Expenditures |  |  | 25,896 |  |
Boston | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 57,071 | 56,368 | 170,545 | 168,118 |
Operating expenses | 16,351 | 16,399 | 47,538 | 47,308 |
Operating income | 40,720 | 39,969 | 123,007 | 120,810 |
Total Assets | 1,670,467 |  | 1,670,467 |  |
Capital Expenditures |  |  | 18,906 |  |
Seattle | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 49,268 | 46,948 | 133,279 | 125,910 |
Operating expenses | 13,647 | 12,493 | 37,205 | 34,979 |
Operating income | 35,621 | 34,455 | 96,074 | 90,931 |
Total Assets | 1,172,356 |  | 1,172,356 |  |
Capital Expenditures |  |  | 15,499 |  |
Non-same store | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 33,974 | 14,128 | 144,975 | 78,287 |
Operating expenses | 10,371 | 6,120 | 53,367 | 29,173 |
Operating income | 23,603 | 8,008 | 91,608 | 49,114 |
Total Assets | 3,080,697 |  | 3,080,697 |  |
Capital Expenditures |  |  | 3,206 |  |
Other | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 2,835 | 17,134 | 9,892 | 90,685 |
Operating expenses | 4,593 | 8,420 | 10,364 | 37,059 |
Operating income | (1,758) | $ 8,714 | (472) | $ 53,626 |
Total Assets | $ 886,091 |  | 886,091 |  |
Capital Expenditures |  |  | $ 414 |  |

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