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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, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 603,920 | $ 616,165 |
Operating income | 204,371 | 216,625 |
Total Assets | 20,608,338 |  | $ 20,704,148
Capital Expenditures | 39,297 |  |
Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 560,236 | 545,846 |
Operating expenses | 167,316 | 161,004 |
Operating income | 392,920 | 384,842 |
Total Assets | 17,170,075 |  |
Capital Expenditures | 37,583 |  |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 43,684 | 70,319 |
Operating expenses | 17,020 | 28,357 |
Operating income | 26,664 | 41,962 |
Total Assets | 3,438,263 |  |
Capital Expenditures | 1,714 |  |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 603,920 | 616,165 |
Operating expenses | 184,336 | 189,361 |
Operating income | 419,584 | 426,804 |
Other markets | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 464 | 437 |
Operating expenses | 197 | 152 |
Operating income | 267 | 285 |
Total Assets | 12,818 |  |
Capital Expenditures | 20 |  |
Los Angeles | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 97,182 | 93,634 |
Operating expenses | 28,570 | 27,215 |
Operating income | 68,612 | 66,419 |
Total Assets | 2,663,858 |  |
Capital Expenditures | 5,150 |  |
San Diego | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 22,558 | 21,471 |
Operating expenses | 6,062 | 5,836 |
Operating income | 16,496 | 15,635 |
Total Assets | 468,868 |  |
Capital Expenditures | 1,111 |  |
Orange County | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 21,656 | 20,522 |
Operating expenses | 5,471 | 5,142 |
Operating income | 16,185 | 15,380 |
Total Assets | 334,555 |  |
Capital Expenditures | 1,617 |  |
Subtotal - Southern California | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 141,396 | 135,627 |
Operating expenses | 40,103 | 38,193 |
Operating income | 101,293 | 97,434 |
Total Assets | 3,467,281 |  |
Capital Expenditures | 7,878 |  |
New York | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 114,386 | 114,038 |
Operating expenses | 43,060 | 40,728 |
Operating income | 71,326 | 73,310 |
Total Assets | 4,279,073 |  |
Capital Expenditures | 6,713 |  |
Washington DC | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 106,442 | 104,294 |
Operating expenses | 32,332 | 31,462 |
Operating income | 74,110 | 72,832 |
Total Assets | 3,892,715 |  |
Capital Expenditures | 9,006 |  |
San Francisco | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 94,008 | 91,361 |
Operating expenses | 22,753 | 22,426 |
Operating income | 71,255 | 68,935 |
Total Assets | 2,509,353 |  |
Capital Expenditures | 7,163 |  |
Boston | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 60,142 | 59,318 |
Operating expenses | 16,767 | 16,614 |
Operating income | 43,375 | 42,704 |
Total Assets | 1,823,241 |  |
Capital Expenditures | 3,419 |  |
Seattle | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 43,398 | 40,771 |
Operating expenses | 12,104 | 11,429 |
Operating income | 31,294 | 29,342 |
Total Assets | 1,185,594 |  |
Capital Expenditures | 3,384 |  |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 46,112 | 19,389 |
Operating expenses | 15,548 | 7,873 |
Operating income | 30,564 | 11,516 |
Total Assets | 2,368,331 |  |
Capital Expenditures | 1,561 |  |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | (2,428) | 50,930 |
Operating expenses | 1,472 | 20,484 |
Operating income | (3,900) | $ 30,446 |
Total Assets | 1,069,932 |  |
Capital Expenditures | $ 153 |  |

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