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Segment Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable operating segments defined by geographical regions (in segments) | segment | 3 |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property revenues | $ 344,947 | $ 333,168 |
Net operating income | 249,984 | 241,164 |
Management and other fees from affiliates | 2,308 | 2,236 |
Corporate-level property management expenses | (7,770) | (7,509) |
Depreciation and amortization | (119,105) | (115,503) |
General and administrative | (14,813) | (10,601) |
Expensed acquisition and investment related costs | (57) | (556) |
Interest expense | (54,861) | (54,583) |
Total return swap income | 2,270 | 2,584 |
Interest and other income | 5,909 | 6,764 |
Equity income from co-investments | 32,774 | 10,899 |
Gain on sale of real estate and land | 0 | 26,174 |
Gain on remeasurement of co-investment | 0 | 86,482 |
Net income | 96,639 | 187,551 |
Net reportable operating segment - real estate assets | 10,488,605 |  | $ 10,579,534
Real estate under development | 395,710 |  | 355,735
Co-investments | 1,290,957 |  | 1,155,984
Cash and cash equivalents, including restricted cash | 139,078 |  | 61,126
Marketable securities | 197,745 |  | 190,004
Notes and other receivables (includes related party receivables of $9.9 million and $41.2 million as of March 31, 2018 and December 31, 2017, respectively) | 70,525 |  | 100,926
Prepaid expenses and other assets | 60,047 |  | 52,397
Total assets | 12,642,667 |  | 12,495,706
Operating Segments [Member] | Southern California [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property revenues | 152,060 | 147,099 |
Net operating income | 107,932 | 104,501 |
Net reportable operating segment - real estate assets | 4,744,730 |  | 4,788,225
Operating Segments [Member] | Northern California [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property revenues | 128,622 | 123,308 |
Net operating income | 94,717 | 89,743 |
Net reportable operating segment - real estate assets | 4,182,261 |  | 4,215,449
Operating Segments [Member] | Seattle Metro [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property revenues | 58,713 | 56,192 |
Net operating income | 42,012 | 40,388 |
Net reportable operating segment - real estate assets | 1,506,405 |  | 1,520,372
Other real estate assets [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property revenues | 5,552 | 6,569 |
Net operating income | 5,323 | $ 6,532 |
Net reportable operating segment - real estate assets | $ 55,209 |  | $ 55,488

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