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Segment Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Dec. 31, 2018 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] |  |  |  |  |  |  |  |
Total revenues |  |  | $ 366,932 | $ 350,917 | $ 1,084,790 | $ 1,046,895 |  |
Net operating income |  |  | 262,033 | 250,835 | 781,533 | 753,199 |  |
Corporate-level property management expenses |  |  | (8,255) | (7,761) | (24,620) | (23,313) |  |
Depreciation and amortization |  |  | (120,809) | (120,852) | (360,842) | (359,287) |  |
General and administrative |  |  | (11,345) | (10,601) | (38,731) | (36,539) |  |
Expensed acquisition and investment related costs |  |  | (13) | (31) | (69) | (156) |  |
Gain on sale of real estate and land |  |  | 0 | 0 | 0 | 22,244 |  |
Interest expense |  |  | (54,896) | (55,196) | (162,651) | (166,335) |  |
Total return swap income |  |  | 2,154 | 2,184 | 6,174 | 6,682 |  |
Interest and other income |  |  | 8,685 | 8,437 | 29,293 | 21,241 |  |
Equity income from co-investments |  |  | 21,700 | 16,788 | 54,935 | 64,611 |  |
Deferred tax expense on unrealized gain on unconsolidated co-investment |  |  | (1,457) | 0 | (1,457) | 0 |  |
Gain on early retirement of debt, net | $ 5,500 | $ 1,400 | 5,475 | 0 | 7,143 | 0 |  |
Gain on remeasurement of co-investment |  |  | 0 | 0 | 31,535 | 0 |  |
Net income |  |  | 105,700 | 86,110 | 329,266 | 289,159 |  |
Net reportable operating segment - real estate assets | 10,379,518 |  | 10,379,518 |  | 10,379,518 |  | $ 10,156,553 |
Real estate under development | 562,338 |  | 562,338 |  | 562,338 |  | 454,629 |
Co-investments | 1,413,861 |  | 1,413,861 |  | 1,413,861 |  | 1,300,140 |
Cash and cash equivalents, including restricted cash | 91,726 |  | 91,726 | 174,626 | 91,726 | 174,626 | 151,395 | $ 61,126
Marketable securities | 216,894 |  | 216,894 |  | 216,894 |  | 209,545 |
Notes and other receivables | 216,541 |  | 216,541 |  | 216,541 |  | 71,895 |
Operating lease right-of-use assets | 75,478 |  | 75,478 |  | 75,478 |  | 0 |
Prepaid expenses and other assets | 41,536 |  | 41,536 |  | 41,536 |  | 39,439 |
Total assets | 12,997,892 |  | 12,997,892 |  | 12,997,892 |  | 12,383,596 |
Rental and Other Property Revenues [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 364,504 | 348,610 | 1,077,767 | 1,040,083 |  |
Management and Other Fees From Affiliates Income [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 2,428 | 2,307 | 7,023 | 6,812 |  |
Operating Segments [Member] | Southern California [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Net operating income |  |  | 106,951 | 104,732 | 323,073 | 314,977 |  |
Net reportable operating segment - real estate assets | 4,245,335 |  | 4,245,335 |  | 4,245,335 |  | 4,350,377 |
Operating Segments [Member] | Southern California [Member] | Rental and Other Property Revenues [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 152,312 | 148,575 | 455,302 | 442,382 |  |
Operating Segments [Member] | Northern California [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Net operating income |  |  | 105,381 | 97,244 | 310,407 | 288,222 |  |
Net reportable operating segment - real estate assets | 4,623,559 |  | 4,623,559 |  | 4,623,559 |  | 4,270,238 |
Operating Segments [Member] | Northern California [Member] | Rental and Other Property Revenues [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 144,124 | 131,538 | 420,544 | 389,750 |  |
Operating Segments [Member] | Seattle Metro [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Net operating income |  |  | 43,701 | 40,999 | 129,013 | 123,432 |  |
Net reportable operating segment - real estate assets | 1,444,045 |  | 1,444,045 |  | 1,444,045 |  | 1,472,916 |
Operating Segments [Member] | Seattle Metro [Member] | Rental and Other Property Revenues [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 61,657 | 59,231 | 182,738 | 176,740 |  |
Other real estate assets [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Net operating income |  |  | 6,000 | 7,860 | 19,040 | 26,568 |  |
Net reportable operating segment - real estate assets | $ 66,579 |  | 66,579 |  | 66,579 |  | $ 63,022 |
Other real estate assets [Member] | Rental and Other Property Revenues [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | $ 6,411 | $ 9,266 | $ 19,183 | $ 31,211 |  |

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