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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 366,932 | $ 350,917 | $ 1,084,790 | $ 1,046,895 |
Occupancy threshold for classification as stabilized | 95.00% |  | 95.00% |  |
Deferred revenue | $ 4,100 |  | $ 4,100 |  | $ 6,200
Deferred revenue, revenue recognized |  |  | 2,100 |  |
Deferred revenue balance from contracts with remaining performance obligations | 4,100 |  | 4,100 |  |
Rental [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 358,001 | 342,246 | 1,058,973 | 1,021,742 |
Other Property [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 6,503 | 6,364 | 18,794 | 18,341 |
Management and Other Fees From Affiliates Income [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 2,428 | 2,307 | 7,023 | 6,812 |
Rental and Other Property Revenues [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 364,504 | 348,610 | 1,077,767 | 1,040,083 |
Rental and Other Property Revenues [Member] | Same Property [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 342,115 | 331,695 | 1,019,509 | 987,564 |
Rental and Other Property Revenues [Member] | Acquisitions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 7,309 | 0 | 14,416 | 0 |
Rental and Other Property Revenues [Member] | Development [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 1,859 | 1,091 | 4,184 | 1,560 |
Rental and Other Property Revenues [Member] | Redevelopment [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 5,255 | 5,125 | 15,690 | 15,185 |
Rental and Other Property Revenues [Member] | Non-Residential/Other, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 7,966 | 10,699 | 23,968 | 35,774 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Southern California [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 152,312 | 148,575 | 455,302 | 442,382 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Northern California [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 144,124 | 131,538 | 420,544 | 389,750 |
Rental and Other Property Revenues [Member] | Operating Segments [Member] | Seattle Metro [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | 61,657 | 59,231 | 182,738 | 176,740 |
Rental and Other Property Revenues [Member] | Other real estate assets [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues | $ 6,411 | $ 9,266 | $ 19,183 | $ 31,211 |

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