Real Estate Assets (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2022 USD ($) ft²	Jun. 30, 2022 USD ($) ft²	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)
Acquisitions [Abstract]
Rentable square feet of commercial real estate properties (in sq feet) | ft²	28,100,000				28,100,000
Dispositions [Abstract]
Gains on disposition of property	$ 9,402			$ 38,572	$ 63,546	$ 80,371
Impairments [Abstract]
Impairments of real estate assets	$ 1,515			$ 0	$ 36,515	$ 0
Charlotte Building Acquisition
Acquisitions [Abstract]
Rentable square feet of commercial real estate properties (in sq feet) | ft²	367,000				367,000
Acquisition purchase price	$ 198,000
Charlotte Land Acquisition [Member]
Acquisitions [Abstract]
Acquisition purchase price		$ 27,000
2022 Dispositions [Member]
Dispositions [Abstract]
Sale price of real estate	23,300	100,700	$ 9,600
Closing credits excluded		1,100
Gains on disposition of property	9,400	$ 50,000	$ 4,100
2022 Impairments
Impairments [Abstract]
Impairments of real estate assets	$ 1,500
EQT Plaza Impairment [Member]
Acquisitions [Abstract]
Rentable square feet of commercial real estate properties (in sq feet) | ft²		616,000
Impairments [Abstract]
Impairments of real estate assets		$ 35,000
Square footage occupied by customer (in sq ft) | ft²		317,000