Real Estate Properties - Acquisition Activities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ft² property	Dec. 31, 2020 USD ($) ft² property
Business Acquisition [Line Items]
Number of properties acquired | property	3	2
Rentable square feet (in square feet) | ft²	926,000	163,000
Asset acquisition, consideration transferred	$ 576,478	$ 47,215
Purchase price adjustments	1,761
Assumed Real Estate Lease Obligations	(9,088)
Acquisition related costs	1,264	590
Adjustment for estimated tax liability	13,031
Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	72,078	7,649
Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	404,024	31,772
Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 109,464	$ 7,794
Chicago, IL
Business Acquisition [Line Items]
Number of properties acquired | property	1
Rentable square feet (in square feet) | ft²	531,000
Asset acquisition, consideration transferred	$ 368,331
Assumed Real Estate Lease Obligations	(9,088)
Chicago, IL | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	42,935
Chicago, IL | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	258,348
Chicago, IL | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 76,136
Atlanta, GA
Business Acquisition [Line Items]
Number of properties acquired | property	1
Rentable square feet (in square feet) | ft²	346,000
Asset acquisition, consideration transferred	$ 180,602
Assumed Real Estate Lease Obligations	0
Atlanta, GA | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	13,040
Atlanta, GA | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	135,459
Atlanta, GA | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 32,103
Boston, MA
Business Acquisition [Line Items]
Number of properties acquired | property	1	1
Rentable square feet (in square feet) | ft²	49,000	13,000
Asset acquisition, consideration transferred	$ 27,545	$ 11,864
Assumed Real Estate Lease Obligations	0
Boston, MA | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	16,103	2,618
Boston, MA | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	10,217	9,246
Boston, MA | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 1,225	$ 0
Fort Mill, SC
Business Acquisition [Line Items]
Number of properties acquired | property		1
Rentable square feet (in square feet) | ft²		150,000
Asset acquisition, consideration transferred		$ 35,351
Fort Mill, SC | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		5,031
Fort Mill, SC | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		22,526
Fort Mill, SC | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 7,794