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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, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 632,831 | $ 603,920 |
Operating income | 196,869 | 204,371 |
Total Assets | 20,383,870 |  | $ 20,570,599
Capital Expenditures | 36,747 |  |
Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 590,384 | 577,404 |
Operating expenses | 180,358 | 173,605 |
Operating income | 410,026 | 403,799 |
Total Assets | 17,612,333 |  |
Capital Expenditures | 36,235 |  |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 42,447 | 26,516 |
Operating expenses | 19,758 | 10,731 |
Operating income | 22,689 | 15,785 |
Total Assets | 2,771,537 |  |
Capital Expenditures | 512 |  |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 632,831 | 603,920 |
Operating expenses | 200,116 | 184,336 |
Operating income | 432,715 | 419,584 |
Other markets | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 487 | 464 |
Operating expenses | 165 | 196 |
Operating income | 322 | 268 |
Total Assets | 12,918 |  |
Capital Expenditures | 77 |  |
Los Angeles | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 102,484 | 98,636 |
Operating expenses | 29,860 | 28,651 |
Operating income | 72,624 | 69,985 |
Total Assets | 2,670,909 |  |
Capital Expenditures | 5,939 |  |
Orange County | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 22,502 | 21,656 |
Operating expenses | 5,527 | 5,462 |
Operating income | 16,975 | 16,194 |
Total Assets | 325,898 |  |
Capital Expenditures | 1,620 |  |
San Diego | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 22,493 | 21,723 |
Operating expenses | 5,963 | 5,799 |
Operating income | 16,530 | 15,924 |
Total Assets | 417,593 |  |
Capital Expenditures | 1,270 |  |
Subtotal - Southern California | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 147,479 | 142,015 |
Operating expenses | 41,350 | 39,912 |
Operating income | 106,129 | 102,103 |
Total Assets | 3,414,400 |  |
Capital Expenditures | 8,829 |  |
San Francisco | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 109,212 | 106,306 |
Operating expenses | 26,995 | 26,928 |
Operating income | 82,217 | 79,378 |
Total Assets | 3,020,673 |  |
Capital Expenditures | 8,743 |  |
Washington DC | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 107,155 | 106,443 |
Operating expenses | 33,663 | 32,332 |
Operating income | 73,492 | 74,111 |
Total Assets | 3,771,999 |  |
Capital Expenditures | 5,964 |  |
New York | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 119,626 | 119,363 |
Operating expenses | 47,825 | 45,439 |
Operating income | 71,801 | 73,924 |
Total Assets | 4,447,994 |  |
Capital Expenditures | 5,216 |  |
Boston | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 57,814 | 56,388 |
Operating expenses | 16,672 | 15,783 |
Operating income | 41,142 | 40,605 |
Total Assets | 1,637,837 |  |
Capital Expenditures | 4,358 |  |
Seattle | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 48,611 | 46,425 |
Operating expenses | 13,688 | 13,015 |
Operating income | 34,923 | 33,410 |
Total Assets | 1,306,512 |  |
Capital Expenditures | 3,048 |  |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 38,622 | 15,961 |
Operating expenses | 13,733 | 5,894 |
Operating income | 24,889 | 10,067 |
Total Assets | 2,276,821 |  |
Capital Expenditures | 454 |  |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 3,825 | 10,555 |
Operating expenses | 6,025 | 4,837 |
Operating income | (2,200) | $ 5,718 |
Total Assets | 494,716 |  |
Capital Expenditures | $ 58 |  |

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