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Dispositions - Operating Property Dispositions (Details) $ in Thousands		1 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($) ft² property	Dec. 31, 2021 USD ($) ft² property	Mar. 31, 2021 USD ($) ft² property	Oct. 31, 2019 USD ($) ft² property	May 31, 2019 USD ($) ft² property	Dec. 31, 2021 USD ($) ft² property	Dec. 31, 2020 USD ($) ft² property	Dec. 31, 2019 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet | ft²		15,456,528				15,456,528
Gains on sales of operating properties | $						$ 463,128	$ 35,536	$ 36,802
Disposal group, disposed of by sale | 2021 Dispositions
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		852,746				852,746
Proceeds from sale of property held-for-sale | $						$ 1,118,500
Disposal group, disposed of by sale | 1800 Owens Street, San Francisco, CA (The Exchange on 16th)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | property			1
Rentable square feet | ft²			750,370
Proceeds from sale of property held-for-sale | $			$ 1,081,500
Disposal group, disposed of by sale | 13280 & 13290 Evening Creek Drive South, San Diego, CA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | property		2				2
Rentable square feet | ft²		102,376				102,376
Proceeds from sale of property held-for-sale | $		$ 37,000
Disposal group, disposed of by sale | 2020 Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | property	1						1
Rentable square feet | ft²	87,147						87,147
Proceeds from sale of property held-for-sale | $							$ 75,900
Disposal group, disposed of by sale | 331 Fairchild Drive, Mountain View, CA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | property	1						1
Rentable square feet | ft²	87,147						87,147
Proceeds from sale of property held-for-sale | $	$ 75,900
Disposal group, disposed of by sale | 2019 Dispositions
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 | 2829 Townsgate Road, Thousand Oaks, CA
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 | 2211 Michelson Drive, Irvine, CA
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

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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