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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | $ 652,677 | $ 623,951 | $ 1,925,128 | $ 1,840,170 |
Operating income | 224,731 | 217,786 | 639,254 | 632,707 |
Total Assets | 20,542,150 |  | 20,542,150 |  | $ 20,570,599
Capital Expenditures |  |  | 138,119 |  |
Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 605,412 | 591,714 | 1,767,717 | 1,729,293 |
Operating expenses | 182,220 | 175,796 | 531,532 | 513,836 |
Operating income | 423,192 | 415,918 | 1,236,185 | 1,215,457 |
Total Assets | 17,095,643 |  | 17,095,643 |  |
Capital Expenditures |  |  | 133,683 |  |
Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 47,265 | 32,237 | 157,411 | 110,877 |
Operating expenses | 15,709 | 13,012 | 59,739 | 46,127 |
Operating income | 31,556 | 19,225 | 97,672 | 64,750 |
Total Assets | 3,446,507 |  | 3,446,507 |  |
Capital Expenditures |  |  | 4,436 |  |
Same Store, Non-same Store and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 652,677 | 623,951 | 1,925,128 | 1,840,170 |
Operating expenses | 197,929 | 188,808 | 591,271 | 559,963 |
Operating income | 454,748 | 435,143 | 1,333,857 | 1,280,207 |
Other markets | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 485 | 459 | 1,453 | 1,384 |
Operating expenses | 165 | 158 | 506 | 498 |
Operating income | 320 | 301 | 947 | 886 |
Total Assets | 12,820 |  | 12,820 |  |
Capital Expenditures |  |  | 135 |  |
Los Angeles | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 108,050 | 104,190 | 310,972 | 300,702 |
Operating expenses | 30,848 | 29,470 | 89,211 | 85,972 |
Operating income | 77,202 | 74,720 | 221,761 | 214,730 |
Total Assets | 2,631,459 |  | 2,631,459 |  |
Capital Expenditures |  |  | 21,438 |  |
Orange County | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 23,182 | 22,427 | 68,513 | 66,082 |
Operating expenses | 5,615 | 5,491 | 16,706 | 16,330 |
Operating income | 17,567 | 16,936 | 51,807 | 49,752 |
Total Assets | 321,551 |  | 321,551 |  |
Capital Expenditures |  |  | 6,327 |  |
San Diego | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 23,215 | 22,432 | 68,640 | 66,052 |
Operating expenses | 6,233 | 5,881 | 17,984 | 17,415 |
Operating income | 16,982 | 16,551 | 50,656 | 48,637 |
Total Assets | 410,450 |  | 410,450 |  |
Capital Expenditures |  |  | 3,665 |  |
Subtotal - Southern California | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 154,447 | 149,049 | 448,125 | 432,836 |
Operating expenses | 42,696 | 40,842 | 123,901 | 119,717 |
Operating income | 111,751 | 108,207 | 324,224 | 313,119 |
Total Assets | 3,363,460 |  | 3,363,460 |  |
Capital Expenditures |  |  | 31,430 |  |
San Francisco | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 116,937 | 113,154 | 331,067 | 321,894 |
Operating expenses | 29,271 | 29,527 | 80,377 | 81,942 |
Operating income | 87,666 | 83,627 | 250,690 | 239,952 |
Total Assets | 2,989,059 |  | 2,989,059 |  |
Capital Expenditures |  |  | 34,617 |  |
Washington DC | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 109,637 | 108,764 | 325,480 | 322,310 |
Operating expenses | 34,722 | 33,474 | 101,620 | 98,046 |
Operating income | 74,915 | 75,290 | 223,860 | 224,264 |
Total Assets | 3,734,007 |  | 3,734,007 |  |
Capital Expenditures |  |  | 21,722 |  |
New York | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 115,757 | 114,799 | 343,239 | 341,295 |
Operating expenses | 45,156 | 42,620 | 135,700 | 128,076 |
Operating income | 70,601 | 72,179 | 207,539 | 213,219 |
Total Assets | 4,108,581 |  | 4,108,581 |  |
Capital Expenditures |  |  | 17,217 |  |
Boston | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 57,531 | 56,022 | 171,042 | 167,010 |
Operating expenses | 16,073 | 15,726 | 47,666 | 45,871 |
Operating income | 41,458 | 40,296 | 123,376 | 121,139 |
Total Assets | 1,599,983 |  | 1,599,983 |  |
Capital Expenditures |  |  | 16,477 |  |
Seattle | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 50,618 | 49,467 | 147,311 | 142,564 |
Operating expenses | 14,137 | 13,449 | 41,762 | 39,686 |
Operating income | 36,481 | 36,018 | 105,549 | 102,878 |
Total Assets | 1,287,733 |  | 1,287,733 |  |
Capital Expenditures |  |  | 12,085 |  |
Non-same store | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 42,702 | 18,252 | 134,308 | 60,446 |
Operating expenses | 13,605 | 6,870 | 45,997 | 21,096 |
Operating income | 29,097 | 11,382 | 88,311 | 39,350 |
Total Assets | 2,884,686 |  | 2,884,686 |  |
Capital Expenditures |  |  | 4,171 |  |
Other [Member] | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 4,563 | 13,985 | 23,103 | 50,431 |
Operating expenses | 2,104 | 6,142 | 13,742 | 25,031 |
Operating income | 2,459 | $ 7,843 | 9,361 | $ 25,400 |
Total Assets | $ 561,821 |  | 561,821 |  |
Capital Expenditures |  |  | $ 265 |  |

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