Real Estate Assets (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2024 USD ($) ft² a numberOfBuildings	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2024 USD ($) ft² a numberOfBuildings	Dec. 31, 2023 USD ($) numberOfBuildings	Dec. 31, 2022 USD ($) ft² numberOfBuildings
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²	27,800,000			27,800,000
Dispositions [Abstract]
Gains on disposition of property				$ 46,817	$ 47,773	$ 63,546
Impairments [Abstract]
Impairments of real estate assets				24,600	0	36,515
Atlanta GA Ground Lease Acquisition [Member]
Acquisitions [Abstract]
Purchase price of acquisition				$ 50,800
Number of buildings | numberOfBuildings	12			12
Rentable square feet of commercial real estate (in square feet) | ft²	1,700,000			1,700,000
Undeveloped land suitable for future development (in acres) | a	13			13
Raleigh NC Land Acquisition
Acquisitions [Abstract]
Purchase price of acquisition					$ 2,700
SIX50 at Legacy Union [Member]
Acquisitions [Abstract]
Purchase price of acquisition						$ 198,000
Rentable square feet of commercial real estate (in square feet) | ft²						367,000
Charlotte NC Land Acquisition [Member]
Acquisitions [Abstract]
Purchase price of acquisition						$ 27,000
2024 Dispositions
Dispositions [Abstract]
Number of buildings sold | numberOfBuildings	10			10
Sales price of disposition				$ 105,300
Gains on disposition of property				$ 46,800
2023 Dispostions
Dispositions [Abstract]
Number of buildings sold | numberOfBuildings					4
Sales price of disposition					$ 103,800
Gains on disposition of property					47,800
2022 Dispositions [Member]
Dispositions [Abstract]
Number of buildings sold | numberOfBuildings						5
Sales price of disposition						$ 133,500
Closing credits excluded for unfunded building and/or tenant improvements						1,100
Gains on disposition of property						$ 63,500
Seller Financed Transaction [Member]
Dispositions [Abstract]
Sales price of disposition					21,000
Seller Financing [Abstract]
Proceeds from sale of real estate					2,000
Non-recourse seller financing					$ 19,000
Term of debt instrument					2 years
Interest rate basis					SOFR
Interest rate, basis spread (in hundredths)					1.00%
2024 Impairments [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²	616,000			616,000
Impairments [Abstract]
Impairments of real estate assets	$ 24,600
2022 Impairments [Member]
Impairments [Abstract]
Impairments of real estate assets		$ 1,500	$ 35,000