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Real Estate - Properties Sold and Held for Sale (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 22, 2021 USD ($) ft² property | Jul. 26, 2021 USD ($) ft² property | Dec. 17, 2020 USD ($) ft² | Dec. 02, 2020 USD ($) ft² | Apr. 21, 2020 USD ($) ft² | Sep. 30, 2021 USD ($) ft² property | Dec. 31, 2020 USD ($) ft²
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of real estate |  | $ (11,200) |  |  |  |  |
Office |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Number of properties held for sale | property |  | 12 |  |  |  | 12 |
Retail |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Number of properties held for sale | property | 8 |  |  |  |  | 8 |
2021 Properties | Disposal group |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  |  |  |  |  | 3,063 |
Contract Sales Price |  |  |  |  |  | $ 934,314 |
Gain (loss) on sale of real estate |  |  |  |  |  | $ 46,441 |
2021 Properties | Disposal group | Office Portfolio | Office |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  | 2,370 |  |  |  |  |
Contract Sales Price |  | $ 766,000 |  |  |  |  |
Gain (loss) on sale of real estate |  | $ (11,220) |  |  |  |  |
2021 Properties | Disposal group | Retail Profile | Retail |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² | 693 |  |  |  |  |  |
Contract Sales Price | $ 168,314 |  |  |  |  |  |
Gain (loss) on sale of real estate | $ 57,661 |  |  |  |  |  |
2020 Properties | Disposal group |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  |  |  |  |  |  | 565
Contract Sales Price |  |  |  |  |  |  | $ 163,500
Gain (loss) on sale of real estate |  |  |  |  |  |  | $ (14,325)
2020 Properties | Disposal group | John Marshall II | Office |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  |  |  |  | 223 |  |
Contract Sales Price |  |  |  |  | $ 57,000 |  |
Gain (loss) on sale of real estate |  |  |  |  | $ (6,855) |  |
2020 Properties | Disposal group | Monument II | Office |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  |  |  | 207 |  |  |
Contract Sales Price |  |  |  | $ 53,000 |  |  |
Gain (loss) on sale of real estate |  |  |  | $ (8,595) |  |  |
2020 Properties | Disposal group | 1227 25th Street | Office |  |  |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |  |  |
Rentable Square Feet (sq ft) | ft² |  |  | 135 |  |  |  |
Contract Sales Price |  |  | $ 53,500 |  |  |  |
Gain (loss) on sale of real estate |  |  | $ 1,125 |  |  |  |

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