Real Estate Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2023 USD ($) parcel	Dec. 31, 2022 USD ($) ft² numberOfBuildings	Dec. 31, 2021 USD ($) ft² numberOfLoans numberOfBuildings numberOfOfficeBuildings	Dec. 31, 2020 USD ($) a numberOfBuildings parcel shares
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²				28,800,000
Percentage of equity interest in joint ventures, maximum				50.00%
Dispositions [Abstract]
Gains on disposition of property				$ 63,546	$ 174,059	$ 215,897
Impairments [Abstract]
Impairments of real estate assets				$ 36,515	0	1,778
SIX50 at Legacy Union [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²				367,000
Purchase price of acquisition				$ 198,000
Charlotte NC Land Acquisition [Member]
Acquisitions [Abstract]
Purchase price of acquisition				27,000
PAC Portfolio Acquisition [Member]
Acquisitions [Abstract]
Purchase price of acquisition					653,600
Capitalized acquisition costs					$ 4,500
Number of loans assumed in acquisition | numberOfLoans					4
150 Fayetteville Asset [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²					560,000
CAPTRUST Towers Asset [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²					300,000
Capitol Towers Asset [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²					479,000
Morrocroft Centre Asset [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²					291,000
Nashville TN Land Acquisitions [Member]
Acquisitions [Abstract]
Purchase price of acquisition				$ 15,500	$ 74,100
Nashville TN Land Acquisitions [Member] | Forecast [Member]
Acquisitions [Abstract]
Purchase price of acquisition			$ 16,000
Number of development parcels acquired (in parcels) | parcel			1
Forum Portfolio Acquisition [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²					636,000
Purchase price of acquisition					$ 131,300
Percentage of partner's interest in asset acquired (in hundredths)					75.00%
Number of office properties acquired | numberOfOfficeBuildings					5
Percentage of equity interest in joint ventures, maximum					25.00%
2020 Land Acquisitions [Member]
Acquisitions [Abstract]
Purchase price of acquisition						$ 8,500
Number of development parcels acquired (in parcels) | parcel						2
Undeveloped land suitable for future development (in acres) | a						1
Issuance of Common Units in acquisition (in units) | shares						118,592
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
2021 Dispositions [Member]
Dispositions [Abstract]
Number of buildings sold | numberOfBuildings					13
Sales price of disposition					$ 384,600
Closing credits excluded for unfunded building and/or tenant improvements					6,900
Gains on disposition of property					$ 172,800
2020 Dispositions [Member]
Dispositions [Abstract]
Number of buildings sold | numberOfBuildings						52
Sales price of disposition						$ 494,200
Closing credits excluded for unfunded building and/or tenant improvements						5,700
Gains on disposition of property						215,500
2016 Land Disposition [Member]
Dispositions [Abstract]
Gains on disposition of property						400
2022 Impairments [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate (in square feet) | ft²		616,000
Impairments [Abstract]
Impairments of real estate assets	$ 1,500	$ 35,000
Square footage occupied by customer (in sq feet) | ft²		317,000
2020 Impairments [Member]
Impairments [Abstract]
Impairments of real estate assets						$ 1,800