Real Estate - Properties Sold and Held for Sale (Details) $ in Thousands			12 Months Ended
	Sep. 22, 2021 USD ($) ft² property	Jul. 26, 2021 USD ($) ft² property	Dec. 31, 2021 USD ($) ft²
Office
Properties Sold and Held for Sale [Line Items]
Number of properties held for sale | property		12
Retail
Properties Sold and Held for Sale [Line Items]
Number of properties held for sale | property	8
2021 properties | Disposal group
Properties Sold and Held for Sale [Line Items]
Rentable Square Feet (sq ft) | ft²			3,063,000
Contract Sales Price			$ 934,314
(Loss) Gain on Sale			$ 46,441
2021 properties | Disposal group | Office Portfolio | Office
Properties Sold and Held for Sale [Line Items]
Rentable Square Feet (sq ft) | ft²		2,370,000
Contract Sales Price		$ 766,000
(Loss) Gain on Sale		$ (11,220)
2021 properties | Disposal group | Retail Profile | Retail
Properties Sold and Held for Sale [Line Items]
Rentable Square Feet (sq ft) | ft²	693,000
Contract Sales Price	$ 168,314
(Loss) Gain on Sale	$ 57,661