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Real Estate - Narrative (Details) $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 26, 2021 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 22, 2021 property | Jun. 30, 2021 USD ($) property | Dec. 31, 2020 USD ($)
Real Estate [Line Items] |  |  |  |  |
Weighted average life for absorption costs |  | 4 months |  |  |
Properties under development or held for future development |  | $ 30,254 |  |  | $ 36,494
Gain (loss) on sale of real estate | $ (11,200) |  |  |  |
Real estate impairment |  | $ 0 |  |  |
Held for sale |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Properties under development or held for future development |  |  |  |  | $ 1,122
Office |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties held for sale | property | 12 | 12 |  |  |
Office | Held for sale | 2021 Properties |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Contract sales price |  |  |  | $ 766,000 |
Retail |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties held for sale | property |  | 8 | 8 |  |
Retail | Held for sale |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Contract sales price |  |  |  | $ 168,300 |
Number of properties held for sale | property |  |  |  | 8 |
Riverside Developments |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Properties under development or held for future development |  | $ 29,400 |  |  |

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