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Segment Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 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] |  |  |  |  |
Property revenues | $ 327,078,000 | $ 302,522,000 | $ 958,818,000 | $ 876,852,000 |
Net operating income | 227,717,000 | 208,403,000 | 668,888,000 | 605,485,000 |
Management and other fees from affiliates | 2,093,000 | 2,104,000 | 6,145,000 | 6,809,000 |
Depreciation and amortization | (110,467,000) | (116,308,000) | (329,847,000) | (336,946,000) |
General and administrative | (9,647,000) | (11,129,000) | (28,527,000) | (31,223,000) |
Merger and integration expenses | 0 | 0 | 0 | (3,798,000) |
Acquisition and investment related costs | (284,000) | (381,000) | (1,379,000) | (1,357,000) |
Interest expense | (56,693,000) | (50,053,000) | (164,727,000) | (148,401,000) |
Total return swap income | 3,143,000 | 0 | 9,080,000 | 0 |
Interest and other income | 4,943,000 | 7,367,000 | 19,560,000 | 14,820,000 |
Equity income in co-investments | 9,568,000 | 7,179,000 | 38,932,000 | 15,962,000 |
Loss on early retirement of debt | (211,000) | 0 | (211,000) | 0 |
Gain on sale of real estate and land | 0 | 0 | 20,258,000 | 7,112,000 |
Deferred tax expense on gain on sale of real estate and land | 0 | 0 | (4,279,000) | 0 |
Gain on remeasurement of co-investment | 0 | 0 | 0 | 34,014,000 |
Net income | 70,162,000 | 47,182,000 | 233,893,000 | 162,477,000 |
Net reportable operating segment - real estate assets | 10,443,912,000 |  | 10,443,912,000 |  | $ 10,381,577,000
Real estate under development | 170,972,000 |  | 170,972,000 |  | 242,326,000
Co-investments | 1,122,913,000 |  | 1,122,913,000 |  | 1,036,047,000
Real estate held for sale, net | 0 |  | 0 |  | 26,879,000
Cash and cash equivalents, including restricted cash | 211,055,000 |  | 211,055,000 |  | 123,055,000
Marketable securities | 153,703,000 |  | 153,703,000 |  | 137,485,000
Notes and other receivables | 22,941,000 |  | 22,941,000 |  | 19,285,000
Prepaid expenses and other assets | 51,700,000 |  | 51,700,000 |  | 38,437,000
Total assets | 12,177,196,000 |  | 12,177,196,000 |  | 12,005,091,000
Reportable Geographical Components [Member] | Southern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 147,953,000 | 135,900,000 | 434,217,000 | 390,381,000 |
Net operating income | 100,447,000 | 90,377,000 | 295,834,000 | 261,320,000 |
Net reportable operating segment - real estate assets | 4,830,293,000 |  | 4,830,293,000 |  | 4,912,264,000
Reportable Geographical Components [Member] | Northern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 117,699,000 | 106,428,000 | 345,793,000 | 308,118,000 |
Net operating income | 84,790,000 | 76,327,000 | 249,011,000 | 219,906,000 |
Net reportable operating segment - real estate assets | 3,844,421,000 |  | 3,844,421,000 |  | 3,749,072,000
Reportable Geographical Components [Member] | Seattle Metro [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 55,544,000 | 51,181,000 | 161,192,000 | 149,661,000 |
Net operating income | 37,688,000 | 34,484,000 | 109,352,000 | 101,288,000 |
Net reportable operating segment - real estate assets | 1,679,303,000 |  | 1,679,303,000 |  | 1,613,175,000
Segment Reconciling Items [Member] | Other Real Estate Assets [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 5,882,000 | 9,013,000 | 17,616,000 | 28,692,000 |
Net operating income | 4,792,000 | $ 7,215,000 | 14,691,000 | $ 22,971,000 |
Net reportable operating segment - real estate assets | $ 89,895,000 |  | $ 89,895,000 |  | $ 107,066,000

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