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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($) | Dec. 31, 2016 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 | $ 341,974 | $ 327,078 | $ 1,011,908 | $ 958,818 |
Net operating income | 237,837 | 227,717 | 709,993 | 668,888 |
Management and other fees from affiliates | 2,395 | 2,093 | 6,927 | 6,145 |
Depreciation and amortization | (117,451) | (110,467) | (350,893) | (329,847) |
General and administrative | (9,788) | (9,647) | (30,726) | (28,527) |
Acquisition and investment related costs | (324) | (284) | (1,154) | (1,379) |
Interest expense | (55,938) | (56,693) | (167,333) | (164,727) |
Total return swap income | 2,538 | 3,143 | 7,653 | 9,080 |
Interest and other income | 5,790 | 4,943 | 17,916 | 19,560 |
Equity income from co-investments | 19,727 | 9,568 | 40,934 | 38,932 |
Loss on early retirement of debt | 0 | (211) | 0 | (211) |
Gain on sale of real estate and land | 249 | 0 | 26,423 | 20,258 |
Deferred tax expense on gain on sale of real estate and land | 0 | 0 | 0 | (4,279) |
Gain on remeasurement of co-investment | 0 | 0 | 88,641 | 0 |
Net income | 85,035 | 70,162 | 348,381 | 233,893 |
Net reportable operating segment - real estate assets | 10,653,264 |  | 10,653,264 |  | $ 10,364,760
Real estate under development | 313,825 |  | 313,825 |  | 190,505
Co-investments | 1,124,577 |  | 1,124,577 |  | 1,161,275
Real estate held for sale, net | 0 |  | 0 |  | 101,957
Cash and cash equivalents, including restricted cash | 63,273 |  | 63,273 |  | 170,302
Marketable securities | 184,574 |  | 184,574 |  | 139,189
Notes and other receivables (includes related party receivables of $65.6 million and $11.3 million as of September 30, 2017 and December 31, 2016, respectively) | 121,557 |  | 121,557 |  | 40,970
Prepaid expenses and other assets | 51,453 |  | 51,453 |  | 48,450
Total assets | 12,512,523 |  | 12,512,523 |  | 12,217,408
Operating Segments [Member] | Southern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 150,413 | 142,112 | 445,296 | 417,114 |
Net operating income | 102,699 | 96,486 | 305,894 | 284,345 |
Net reportable operating segment - real estate assets | 4,822,941 |  | 4,822,941 |  | 4,924,792
Operating Segments [Member] | Northern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 127,673 | 115,318 | 377,531 | 338,761 |
Net operating income | 91,018 | 83,042 | 271,224 | 243,876 |
Net reportable operating segment - real estate assets | 4,241,460 |  | 4,241,460 |  | 3,791,549
Operating Segments [Member] | Seattle Metro [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 58,285 | 55,543 | 171,564 | 161,192 |
Net operating income | 39,674 | 37,688 | 116,733 | 109,352 |
Net reportable operating segment - real estate assets | 1,532,784 |  | 1,532,784 |  | 1,570,340
Other real estate assets [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 5,603 | 14,105 | 17,517 | 41,751 |
Net operating income | 4,446 | $ 10,501 | 16,142 | $ 31,315 |
Net reportable operating segment - real estate assets | $ 56,079 |  | $ 56,079 |  | $ 78,079

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