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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | $ 639,620 | $ 612,299 | $ 1,272,451 | $ 1,216,219 |
Operating income | 217,654 | 210,550 | 414,523 | 414,921 |
Total Assets | 20,406,582 |  | 20,406,582 |  | $ 20,570,599
Capital Expenditures |  |  | 85,987 |  |
Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 599,628 | 586,757 | 1,183,348 | 1,158,193 |
Operating expenses | 177,679 | 172,104 | 355,724 | 343,753 |
Operating income | 421,949 | 414,653 | 827,624 | 814,440 |
Total Assets | 17,456,473 |  | 17,456,473 |  |
Capital Expenditures |  |  | 83,659 |  |
Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 39,992 | 25,542 | 89,103 | 58,026 |
Operating expenses | 15,547 | 14,715 | 37,618 | 27,402 |
Operating income | 24,445 | 10,827 | 51,485 | 30,624 |
Total Assets | 2,950,109 |  | 2,950,109 |  |
Capital Expenditures |  |  | 2,328 |  |
Same Store, Non-same Store and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 639,620 | 612,299 | 1,272,451 | 1,216,219 |
Operating expenses | 193,226 | 186,819 | 393,342 | 371,155 |
Operating income | 446,394 | 425,480 | 879,109 | 845,064 |
Other markets | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 481 | 461 | 969 | 924 |
Operating expenses | 175 | 144 | 341 | 340 |
Operating income | 306 | 317 | 628 | 584 |
Total Assets | 12,795 |  | 12,795 |  |
Capital Expenditures |  |  | 102 |  |
Los Angeles | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 102,619 | 99,921 | 205,103 | 198,557 |
Operating expenses | 29,032 | 28,309 | 58,892 | 56,960 |
Operating income | 73,587 | 71,612 | 146,211 | 141,597 |
Total Assets | 2,649,731 |  | 2,649,731 |  |
Capital Expenditures |  |  | 13,220 |  |
Orange County | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 22,829 | 21,998 | 45,331 | 43,654 |
Operating expenses | 5,564 | 5,376 | 11,090 | 10,838 |
Operating income | 17,265 | 16,622 | 34,241 | 32,816 |
Total Assets | 323,604 |  | 323,604 |  |
Capital Expenditures |  |  | 4,017 |  |
San Diego | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 22,932 | 21,897 | 45,425 | 43,620 |
Operating expenses | 5,788 | 5,736 | 11,751 | 11,535 |
Operating income | 17,144 | 16,161 | 33,674 | 32,085 |
Total Assets | 413,701 |  | 413,701 |  |
Capital Expenditures |  |  | 2,481 |  |
Subtotal - Southern California | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 148,380 | 143,816 | 295,859 | 285,831 |
Operating expenses | 40,384 | 39,421 | 81,733 | 79,333 |
Operating income | 107,996 | 104,395 | 214,126 | 206,498 |
Total Assets | 3,387,036 |  | 3,387,036 |  |
Capital Expenditures |  |  | 19,718 |  |
San Francisco | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 115,332 | 111,835 | 219,400 | 213,516 |
Operating expenses | 27,581 | 28,466 | 52,854 | 54,018 |
Operating income | 87,751 | 83,369 | 166,546 | 159,498 |
Total Assets | 3,004,183 |  | 3,004,183 |  |
Capital Expenditures |  |  | 21,259 |  |
Washington DC | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 108,689 | 107,103 | 215,843 | 213,546 |
Operating expenses | 33,237 | 32,241 | 66,899 | 64,572 |
Operating income | 75,452 | 74,862 | 148,944 | 148,974 |
Total Assets | 3,742,083 |  | 3,742,083 |  |
Capital Expenditures |  |  | 14,137 |  |
New York | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 120,498 | 120,005 | 240,124 | 239,367 |
Operating expenses | 46,680 | 43,499 | 94,505 | 88,938 |
Operating income | 73,818 | 76,506 | 145,619 | 150,429 |
Total Assets | 4,404,182 |  | 4,404,182 |  |
Capital Expenditures |  |  | 12,092 |  |
Boston | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 57,217 | 55,943 | 113,511 | 110,989 |
Operating expenses | 15,511 | 14,941 | 31,593 | 30,145 |
Operating income | 41,706 | 41,002 | 81,918 | 80,844 |
Total Assets | 1,609,747 |  | 1,609,747 |  |
Capital Expenditures |  |  | 9,451 |  |
Seattle | Same store |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 49,031 | 47,594 | 97,642 | 94,020 |
Operating expenses | 14,111 | 13,392 | 27,799 | 26,407 |
Operating income | 34,920 | 34,202 | 69,843 | 67,613 |
Total Assets | 1,296,447 |  | 1,296,447 |  |
Capital Expenditures |  |  | 6,900 |  |
Non-same store | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 39,427 | 13,850 | 83,193 | 34,439 |
Operating expenses | 13,154 | 5,193 | 29,862 | 12,533 |
Operating income | 26,273 | 8,657 | 53,331 | 21,906 |
Total Assets | 2,414,779 |  | 2,414,779 |  |
Capital Expenditures |  |  | 2,210 |  |
Other [Member] | Non-same store/other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Rental income | 565 | 11,692 | 5,910 | 23,587 |
Operating expenses | 2,393 | 9,522 | 7,756 | 14,869 |
Operating income | (1,828) | $ 2,170 | (1,846) | $ 8,718 |
Total Assets | $ 535,330 |  | 535,330 |  |
Capital Expenditures |  |  | $ 118 |  |

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