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Segment Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable operating segments defined by geographical regions | segment | 3 |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | $ 1,400,053 | $ 1,363,899 | $ 1,294,001
Net operating income | 1,005,536 | 978,939 | 926,906
Corporate-level property management expenses | (31,062) | (30,156) | (30,110)
Depreciation and amortization | (479,884) | (468,881) | (441,682)
General and administrative | (53,451) | (41,385) | (40,751)
Expensed acquisition and investment related costs | (194) | (1,569) | (1,841)
Interest expense | (220,492) | (222,894) | (219,654)
Total return swap income | 8,707 | 10,098 | 11,716
Interest and other income | 23,010 | 24,604 | 27,305
Equity income from co-investments | 89,132 | 86,445 | 48,698
Loss on early retirement of debt | 0 | (1,796) | (606)
Gain on sale of real estate and land | 61,861 | 26,423 | 154,561
Deferred tax expense on gain on sale of real estate and land | 0 | 0 | (4,410)
Gain on remeasurement of co-investment | 1,253 | 88,641 | 0
Net income | 413,599 | 458,043 | 438,410
Net reportable operating segments - real estate assets | 10,156,553 | 10,592,776 |
Real estate under development | 454,629 | 355,735 |
Co-investments | 1,300,140 | 1,155,984 |
Cash and cash equivalents, including restricted cash | 151,395 | 61,126 |
Marketable securities | 209,545 | 190,004 |
Notes and other receivables (includes related party receivables of $11.1 million and $41.2 million as of December 31, 2018 and December 31, 2017, respectively) | 71,895 | 100,926 |
Prepaid expenses and other assets | 39,439 | 39,155 |
Total assets | 12,383,596 | 12,495,706 |
Rental and other property [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 1,390,870 | 1,354,325 | 1,285,723
Management and other fees from affiliates [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 9,183 | 9,574 | 8,278
Operating Segments [Member] | Southern California [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net operating income | 421,613 | 408,070 | 381,212
Net reportable operating segments - real estate assets | 4,350,377 | 4,504,930 |
Operating Segments [Member] | Southern California [Member] | Rental and other property [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 592,281 | 574,552 | 540,000
Operating Segments [Member] | Northern California [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net operating income | 386,401 | 371,795 | 333,757
Net reportable operating segments - real estate assets | 4,270,238 | 4,220,551 |
Operating Segments [Member] | Northern California [Member] | Rental and other property [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 522,561 | 505,313 | 453,140
Operating Segments [Member] | Seattle Metro [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net operating income | 165,397 | 162,253 | 154,147
Net reportable operating segments - real estate assets | 1,472,916 | 1,522,452 |
Operating Segments [Member] | Seattle Metro [Member] | Rental and other property [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 236,525 | 229,871 | 217,259
Other real estate assets [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net operating income | 32,125 | 36,821 | 57,790
Net reportable operating segments - real estate assets | 63,022 | 344,843 |
Other real estate assets [Member] | Rental and other property [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | $ 39,503 | $ 44,589 | $ 75,324

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