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Dispositions - Operating Property Dispositions (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 USD ($) ft² property | May 31, 2019 USD ($) ft² property | Dec. 31, 2018 USD ($) ft² property | Nov. 30, 2018 USD ($) ft² property | Dec. 31, 2020 USD ($) ft² property | Dec. 31, 2019 USD ($) ft² property | Dec. 31, 2018 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  | 14,620,166 |  |
Gains on sales of operating properties | $ |  |  |  |  | $ 35,536 | $ 36,802 | $ 142,926
Disposal group, disposed of by sale [Member] | 2020 Dispositions [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  |  |  | 1 |  |
Rentable square feet | ft² |  |  |  |  | 87,147 |  |
Proceeds from sale of property held-for-sale | $ |  |  |  |  | $ 75,900 |  |
Disposal group, disposed of by sale [Member] | 331 Fairchild Drive, Mountain View, CA [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  |  |  | 1 |  |
Rentable square feet | ft² |  |  |  |  | 87,147 |  |
Proceeds from sale of property held-for-sale | $ |  |  |  |  | $ 75,900 |  |
Disposal group, disposed of by sale [Member] | 2019 Dispositions [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  |  |  |  | 2 |
Rentable square feet | ft² |  |  |  |  |  | 355,654 |
Proceeds from sale of property held-for-sale | $ |  |  |  |  |  | $ 133,800 |
Disposal group, disposed of by sale [Member] | 2829 Townsgate Road, Thousand Oaks, CA [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  | 1 |  |  |  |  |
Rentable square feet | ft² |  | 84,098 |  |  |  |  |
Proceeds from sale of property held-for-sale | $ |  | $ 18,300 |  |  |  |  |
Disposal group, disposed of by sale [Member] | 2211 Michelson Drive Irvine CA [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property | 1 |  |  |  |  |  |
Rentable square feet | ft² | 271,556 |  |  |  |  |  |
Proceeds from sale of property held-for-sale | $ | $ 115,500 |  |  |  |  |  |
Disposal group, disposed of by sale [Member] | 2018 Dispositions [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  | 11 |  |  |  | 11
Rentable square feet | ft² |  |  | 772,246 |  |  |  | 772,246
Proceeds from sale of property held-for-sale | $ |  |  |  |  |  |  | $ 373,000
Disposal group, disposed of by sale [Member] | 1325-1327 Chesapeake Terrace, Sunnyvale, CA [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  |  | 4 |  |  |
Rentable square feet | ft² |  |  |  | 266,982 |  |  |
Proceeds from sale of property held-for-sale | $ |  |  |  | $ 160,300 |  |  |
Disposal group, disposed of by sale [Member] | Plaza Yarrow Bay Properties [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  |  | 4 |  |  |
Rentable square feet | ft² |  |  |  | 279,924 |  |  |
Proceeds from sale of property held-for-sale | $ |  |  |  | $ 134,500 |  |  |
Disposal group, disposed of by sale [Member] | 23925, 23975, & 24025 Park Sorrento, Calabasas, CA [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of buildings | property |  |  | 3 |  |  |  | 3
Rentable square feet | ft² |  |  | 225,340 |  |  |  | 225,340
Proceeds from sale of property held-for-sale | $ |  |  | $ 78,200 |  |  |  |

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