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Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,400,053 | $ 1,363,899 | $ 1,294,001
Deferred revenue | 6,200 | 9,300 |
Deferred revenue, revenue recognized | 3,100 |  |
Deferred revenue balance from contracts with remaining performance obligations | 6,200 |  |
Rental [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,296,435 | 1,263,476 | 1,201,995
Other Property Leasing Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 94,435 | 90,849 | 83,728
Management and other fees from affiliates [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9,183 | 9,574 | 8,278
Rental and other property [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,390,870 | 1,354,325 | 1,285,723
Rental and other property [Member] | Same Property [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,279,640 | 1,244,743 | 1,185,685
Rental and other property [Member] | Acquisitions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 42,481 | 39,289 | 0
Rental and other property [Member] | Development [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,713 | 0 | 0
Rental and other property [Member] | Redevelopment [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 20,345 | 19,641 | 18,737
Rental and other property [Member] | Non-Residential/Other, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45,691 | 50,652 | 81,301
Rental and other property [Member] | Operating Segments [Member] | Southern California [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 592,281 | 574,552 | 540,000
Rental and other property [Member] | Operating Segments [Member] | Northern California [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 522,561 | 505,313 | 453,140
Rental and other property [Member] | Operating Segments [Member] | Seattle Metro [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 236,525 | 229,871 | 217,259
Rental and other property [Member] | Other real estate assets [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 39,503 | $ 44,589 | $ 75,324
Minimum [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Lease term | 6 months |  |
Maximum [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Lease term | 12 months |  |

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