Real Estate - Dispositions (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations ft² in Thousands, $ in Thousands			1 Months Ended
	Jul. 23, 2021 USD ($)	Apr. 07, 2021 USD ($) ft²	Mar. 31, 2020 USD ($) ft²	Feb. 29, 2020 USD ($) ft²	Jul. 01, 2021 USD ($) a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) from sale of property			$ 90,400
One South Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price	$ 271,500
Gain (loss) from sale of property	$ 13,100
A100 Mill Adjacent Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price					$ 6,400
Area of property | a					0.7
Burnett Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price		$ 137,500
Gain (loss) from sale of property		$ (19)
Area of property | ft²		1,000
Hearst Tower
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price			$ 455,500
Area of property | ft²			966
Woodcrest
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price				$ 25,300
Gain (loss) from sale of property				$ 0
Area of property | ft²				386