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Segment Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 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 | $ 1,450,628 | $ 1,390,870 | $ 1,354,325
Total net operating income | 1,052,933 | 1,005,536 | 978,939
Corporate-level property management expenses | (32,899) | (31,062) | (30,156)
Depreciation and amortization | (483,750) | (479,884) | (468,881)
General and administrative | (54,262) | (53,451) | (41,385)
Expensed acquisition and investment related costs | (168) | (194) | (1,569)
Impairment loss | (7,105) | 0 | 0
Gain (loss) on sale of real estate and land | (3,164) | 61,861 | 26,423
Interest expense | (217,339) | (220,492) | (222,894)
Total return swap income | 8,446 | 8,707 | 10,098
Interest and other income | 46,298 | 23,010 | 24,604
Equity income from co-investments | 112,136 | 89,132 | 86,445
Deferred tax expense on unrealized gain on unconsolidated co-investment | (1,457) | 0 | 0
Gain (loss) on early retirement of debt, net | 3,717 | 0 | (1,796)
Gain on remeasurement of co-investment | 31,535 | 1,253 | 88,641
Net income | 464,448 | 413,599 | 458,043
Assets: |  |  |
Net reportable operating segments - real estate assets | 10,348,660 | 10,156,553 |
Real estate under development | 546,075 | 454,629 |
Co-investments | 1,335,339 | 1,300,140 |
Cash and cash equivalents, including restricted cash | 81,094 | 151,395 |
Marketable securities | 144,193 | 209,545 |
Notes and other receivables (includes related party receivables of $90.2 million and $11.1 million as of December 31, 2019 and December 31, 2018, respectively) | 134,365 | 71,895 |
Operating lease right-of-use assets | 74,744 | 0 |
Prepaid expenses and other assets | 40,935 | 39,439 |
Total assets | 12,705,405 | 12,383,596 |
Rental and Other Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 1,450,628 | 1,390,870 | 1,354,325
Management and Other Fees from Affiliates |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Management and other fees from affiliates | 9,527 | 9,183 | 9,574
Operating Segments | Southern California |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total net operating income | 434,267 | 421,274 | 407,771
Assets: |  |  |
Net reportable operating segments - real estate assets | 4,233,110 | 4,368,882 |
Operating Segments | Southern California | Rental and Other Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 610,240 | 592,281 | 574,552
Operating Segments | Northern California |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total net operating income | 420,320 | 385,483 | 371,597
Assets: |  |  |
Net reportable operating segments - real estate assets | 4,622,268 | 4,289,232 |
Operating Segments | Northern California | Rental and Other Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 569,556 | 522,561 | 505,313
Operating Segments | Seattle Metro |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total net operating income | 173,875 | 165,244 | 162,111
Assets: |  |  |
Net reportable operating segments - real estate assets | 1,481,061 | 1,485,040 |
Operating Segments | Seattle Metro | Rental and Other Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | 245,476 | 236,525 | 229,871
Other Real Estate Assets |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total net operating income | 24,471 | 33,535 | 37,460
Assets: |  |  |
Net reportable operating segments - real estate assets | 12,221 | 13,399 |
Other Real Estate Assets | Rental and Other Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total property revenues | $ 25,356 | $ 39,503 | $ 44,589

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