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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 |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 662,302 | $ 632,831 |
Operating income | 209,969 | 339,082 |
Total Assets | 20,768,811 |  | $ 20,394,209
Capital Expenditures | 34,018 |  |
Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 622,603 | 603,797 |
Operating expenses | 191,323 | 183,181 |
Operating income | 431,280 | 420,616 |
Total Assets | 18,077,425 |  |
Capital Expenditures | 31,798 |  |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 39,699 | 29,034 |
Operating expenses | 15,189 | 16,935 |
Operating income | 24,510 | 12,099 |
Total Assets | 2,691,386 |  |
Capital Expenditures | 2,220 |  |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 662,302 | 632,831 |
Operating expenses | 206,512 | 200,116 |
Operating income | 455,790 | 432,715 |
Other markets | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 522 | 488 |
Operating expenses | 185 | 164 |
Operating income | 337 | 324 |
Total Assets | 12,852 |  |
Capital Expenditures | 44 |  |
Los Angeles | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 115,399 | 110,996 |
Operating expenses | 34,484 | 32,041 |
Operating income | 80,915 | 78,955 |
Total Assets | 3,049,292 |  |
Capital Expenditures | 7,061 |  |
Orange County | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 25,828 | 24,803 |
Operating expenses | 6,205 | 6,091 |
Operating income | 19,623 | 18,712 |
Total Assets | 415,698 |  |
Capital Expenditures | 1,833 |  |
San Diego | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 23,304 | 22,492 |
Operating expenses | 6,127 | 5,964 |
Operating income | 17,177 | 16,528 |
Total Assets | 401,881 |  |
Capital Expenditures | 630 |  |
Subtotal - Southern California | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 164,531 | 158,291 |
Operating expenses | 46,816 | 44,096 |
Operating income | 117,715 | 114,195 |
Total Assets | 3,866,871 |  |
Capital Expenditures | 9,524 |  |
San Francisco | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 121,761 | 117,352 |
Operating expenses | 30,417 | 29,410 |
Operating income | 91,344 | 87,942 |
Total Assets | 3,400,898 |  |
Capital Expenditures | 6,039 |  |
Washington DC | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 110,784 | 108,528 |
Operating expenses | 34,674 | 33,910 |
Operating income | 76,110 | 74,618 |
Total Assets | 3,749,155 |  |
Capital Expenditures | 3,683 |  |
New York | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 116,064 | 113,328 |
Operating expenses | 49,089 | 45,549 |
Operating income | 66,975 | 67,779 |
Total Assets | 4,144,468 |  |
Capital Expenditures | 3,754 |  |
Boston | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 58,320 | 56,294 |
Operating expenses | 16,611 | 16,199 |
Operating income | 41,709 | 40,095 |
Total Assets | 1,581,121 |  |
Capital Expenditures | 5,981 |  |
Seattle | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 50,621 | 49,516 |
Operating expenses | 13,531 | 13,853 |
Operating income | 37,090 | 35,663 |
Total Assets | 1,322,060 |  |
Capital Expenditures | 2,773 |  |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 39,409 | 17,396 |
Operating expenses | 13,293 | 7,105 |
Operating income | 26,116 | 10,291 |
Total Assets | 2,192,615 |  |
Capital Expenditures | 2,220 |  |
Other [Member] | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 290 | 11,638 |
Operating expenses | 1,896 | 9,830 |
Operating income | (1,606) | $ 1,808 |
Total Assets | $ 498,771 |  |

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