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Acquisitions - Development Project Acquisitions and Acquisition Costs (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 12, 2019 | Aug. 19, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  |  | $ 173,000 |  |
Asset acquisition, accrued liabilities |  |  |  | 20,890 |  |
Restricted cash |  |  | $ 91,139 | 16,300 | $ 119,430 | $ 9,149
Payments to acquire land parcel |  |  |  | 99,500 |  |
Acquisition costs, capitalized |  |  | 300 | 1,600 | $ 3,800 |
1335 Broadway & 901 Park Boulevard, San Diego, CA [Member] |  |  |  |  |  |
Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 40,000 |  |  |  |
Asset acquisition, accrued liabilities |  | $ 4,000 |  |  |  |
Seattle CBD Project [Member] |  |  |  |  |  |
Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 133,000 |  |  |  |  |
Asset acquisition, accrued liabilities |  |  |  | 6,300 |  |
Restricted cash |  |  | $ 10,000 | $ 10,000 |  |

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