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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 361,635 | $ 348,723 | $ 717,858 | $ 695,978 |
Occupancy threshold for classification as stabilized | 95.00% |  | 95.00% |  |
Deferred revenue | $ 4,800 |  | $ 4,800 |  | $ 6,200
Deferred revenue, revenue recognized |  |  | 1,400 |  |
Deferred revenue balance from contracts with remaining performance obligations | 4,800 |  | 4,800 |  |
Rental [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 353,167 | 340,481 | 700,972 | 679,496 |
Other Property [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 6,208 | 6,045 | 12,291 | 11,977 |
Management and Other Fees From Affiliates Income [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 2,260 | 2,197 | 4,595 | 4,505 |
Rental and Other Property Revenues [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 359,375 | 346,526 | 713,263 | 691,473 |
Rental and Other Property Revenues [Member] | Same Property [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 340,042 | 328,602 | 677,394 | 655,869 |
Rental and Other Property Revenues [Member] | Acquisitions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 4,836 | 0 | 7,107 | 0 |
Rental and Other Property Revenues [Member] | Development [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 1,192 | 450 | 2,325 | 469 |
Rental and Other Property Revenues [Member] | Redevelopment [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 5,223 | 5,036 | 10,435 | 10,060 |
Rental and Other Property Revenues [Member] | Non-Residential/Other, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 8,082 | 12,438 | 16,002 | 25,075 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Southern California [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 151,966 | 147,249 | 302,990 | 293,807 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Northern California [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 140,095 | 129,590 | 276,420 | 258,212 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Seattle Metro [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 60,841 | 58,796 | 121,081 | 117,509 |
Rental and Other Property Revenues [Member] | Other real estate assets [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 6,473 | $ 10,891 | $ 12,772 | $ 21,945 |

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