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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Rental income | $ 2,470,689 | $ 2,422,233 | $ 2,736,578
Operating income | 847,471 | 856,086 | 1,009,238
Total Assets | 20,570,599 | 20,704,148 |
Capital Expenditures | 202,607 | 172,177 |
Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,248,564 | 2,200,094 | 2,099,166
Operating expenses | 656,321 | 639,342 | 613,924
Operating income | 1,592,243 | 1,560,752 | 1,485,242
Total Assets | 16,578,123 | 17,052,235 |
Capital Expenditures | 197,140 | 154,037 |
Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 222,125 | 222,139 | 637,412
Operating expenses | 84,455 | 84,868 | 205,038
Operating income | 137,670 | 137,271 | 432,374
Total Assets | 3,992,476 | 3,651,913 |
Capital Expenditures | 5,467 | 18,140 |
Same Store, Non-same Store and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 2,470,689 | 2,422,233 | 2,736,578
Operating expenses | 740,776 | 724,210 | 818,962
Operating income | 1,729,913 | 1,698,023 | 1,917,616
Other markets | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 1,839 | 1,797 | 1,680
Operating expenses | 652 | 567 | 528
Operating income | 1,187 | 1,230 | 1,152
Total Assets | 12,768 | 12,902 |
Capital Expenditures | 103 | 67 |
Los Angeles | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 396,375 | 382,425 | 349,285
Operating expenses | 111,854 | 111,055 | 104,614
Operating income | 284,521 | 271,370 | 244,671
Total Assets | 2,601,569 | 2,678,787 |
Capital Expenditures | 26,679 | 26,335 |
Orange County | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 88,527 | 84,590 | 75,068
Operating expenses | 21,544 | 20,600 | 18,550
Operating income | 66,983 | 63,990 | 56,518
Total Assets | 328,593 | 336,195 |
Capital Expenditures | 9,237 | 6,876 |
San Diego | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 88,507 | 84,646 | 83,491
Operating expenses | 23,073 | 22,366 | 22,938
Operating income | 65,434 | 62,280 | 60,553
Total Assets | 421,267 | 436,005 |
Capital Expenditures | 4,922 | 4,851 |
Subtotal - Southern California | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 573,409 | 551,661 | 507,844
Operating expenses | 156,471 | 154,021 | 146,102
Operating income | 416,938 | 397,640 | 361,742
Total Assets | 3,351,429 | 3,450,987 |
Capital Expenditures | 40,838 | 38,062 |
Washington DC | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 430,056 | 424,350 | 417,985
Operating expenses | 129,717 | 126,154 | 123,450
Operating income | 300,339 | 298,196 | 294,535
Total Assets | 3,803,185 | 3,916,264 |
Capital Expenditures | 35,423 | 33,867 |
New York | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 457,100 | 456,664 | 450,460
Operating expenses | 165,173 | 159,302 | 152,682
Operating income | 291,927 | 297,362 | 297,778
Total Assets | 4,123,841 | 4,256,087 |
Capital Expenditures | 32,209 | 25,171 |
San Francisco | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 378,939 | 371,633 | 343,089
Operating expenses | 91,777 | 90,393 | 84,603
Operating income | 287,162 | 281,240 | 258,486
Total Assets | 2,467,872 | 2,521,729 |
Capital Expenditures | 38,392 | 24,455 |
Boston | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 228,724 | 225,014 | 232,462
Operating expenses | 63,148 | 62,650 | 67,252
Operating income | 165,576 | 162,364 | 165,210
Total Assets | 1,653,997 | 1,702,675 |
Capital Expenditures | 28,696 | 18,396 |
Seattle | Same store |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 178,497 | 168,975 | 145,646
Operating expenses | 49,383 | 46,255 | 39,307
Operating income | 129,114 | 122,720 | 106,339
Total Assets | 1,165,031 | 1,191,591 |
Capital Expenditures | 21,479 | 14,019 |
Non-same store | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 207,974 | 117,143 | 72,123
Operating expenses | 72,723 | 41,877 | 27,078
Operating income | 135,251 | 75,266 | 45,045
Total Assets | 3,221,468 | 2,727,875 |
Capital Expenditures | 4,849 | 10,965 |
Other | Non-same store/other |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental income | 14,151 | 104,996 | 565,289
Operating expenses | 11,732 | 42,991 | 177,960
Operating income | 2,419 | 62,005 | $ 387,329
Total Assets | 771,008 | 924,038 |
Capital Expenditures | $ 618 | $ 7,175 |

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