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Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,577,681 | $ 2,470,689 | $ 2,422,233
Operating income | 858,560 | 847,471 | 856,086
Total Assets | 20,394,209 | 20,570,599 |
Capital Expenditures | 188,501 | 202,607 |
Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,363,491 | 2,311,240 | 2,200,094
Operating expenses | 705,890 | 681,198 | 639,342
Operating income | 1,657,601 | 1,630,042 | 1,560,752
Total Assets | 16,945,585 | 17,412,173 |
Capital Expenditures | 181,559 | 195,960 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 214,190 | 159,449 | 222,139
Operating expenses | 81,259 | 59,578 | 84,868
Operating income | 132,931 | 99,871 | 137,271
Total Assets | 3,448,624 | 3,158,426 |
Capital Expenditures | 6,942 | 6,647 |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,577,681 | 2,470,689 | 2,422,233
Operating expenses | 787,149 | 740,776 | 724,210
Operating income | 1,790,532 | 1,729,913 | 1,698,023
Other markets | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 1,940 | 1,839 | 1,797
Operating expenses | 657 | 652 | 567
Operating income | 1,283 | 1,187 | 1,230
Total Assets | 12,781 | 12,768 |
Capital Expenditures | 163 | 103 |
Los Angeles | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 416,688 | 402,192 | 382,425
Operating expenses | 119,473 | 114,055 | 111,055
Operating income | 297,215 | 288,137 | 271,370
Total Assets | 2,608,347 | 2,692,602 |
Capital Expenditures | 28,306 | 26,921 |
Orange County | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 91,650 | 88,527 | 84,590
Operating expenses | 22,071 | 21,544 | 20,600
Operating income | 69,579 | 66,983 | 63,990
Total Assets | 318,472 | 328,593 |
Capital Expenditures | 8,192 | 9,237 |
San Diego | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 91,971 | 88,507 | 84,646
Operating expenses | 24,023 | 23,073 | 22,366
Operating income | 67,948 | 65,434 | 62,280
Total Assets | 405,449 | 421,267 |
Capital Expenditures | 4,525 | 4,922 |
Subtotal - Southern California | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 600,309 | 579,226 | 551,661
Operating expenses | 165,567 | 158,672 | 154,021
Operating income | 434,742 | 420,554 | 397,640
Total Assets | 3,332,268 | 3,442,462 |
Capital Expenditures | 41,023 | 41,080 |
San Francisco | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 442,773 | 430,501 | 371,633
Operating expenses | 105,686 | 108,689 | 90,393
Operating income | 337,087 | 321,812 | 281,240
Total Assets | 2,967,735 | 3,039,552 |
Capital Expenditures | 44,837 | 38,618 |
Washington DC | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 434,545 | 430,060 | 424,350
Operating expenses | 134,427 | 129,720 | 126,154
Operating income | 300,118 | 300,340 | 298,196
Total Assets | 3,702,368 | 3,803,185 |
Capital Expenditures | 29,616 | 35,423 |
New York | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 458,366 | 454,945 | 456,664
Operating expenses | 181,040 | 170,064 | 159,302
Operating income | 277,326 | 284,881 | 297,362
Total Assets | 4,063,568 | 4,160,603 |
Capital Expenditures | 23,472 | 30,403 |
Boston | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 229,079 | 223,595 | 225,014
Operating expenses | 63,348 | 60,931 | 62,650
Operating income | 165,731 | 162,664 | 162,364
Total Assets | 1,589,000 | 1,636,925 |
Capital Expenditures | 24,623 | 28,687 |
Seattle | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 196,479 | 191,074 | 168,975
Operating expenses | 55,165 | 52,470 | 46,255
Operating income | 141,314 | 138,604 | 122,720
Total Assets | 1,277,865 | 1,316,678 |
Capital Expenditures | 17,825 | 21,646 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 190,814 | 95,016 | 117,143
Operating expenses | 63,907 | 30,742 | 41,877
Operating income | 126,907 | 64,274 | 75,266
Total Assets | 2,940,770 | 2,276,312 |
Capital Expenditures | 6,665 | 3,704 |
Other [Member] | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 23,376 | 64,433 | 104,996
Operating expenses | 17,352 | 28,836 | 42,991
Operating income | 6,024 | 35,597 | $ 62,005
Total Assets | 507,854 | 882,114 |
Capital Expenditures | $ 277 | $ 2,943 |

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