Real Estate Properties - Disposition Activities (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 27, 2023 USD ($) ft² property	Sep. 30, 2023 USD ($) ft² property	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) ft² property	Sep. 30, 2022 USD ($)
Real Estate Properties [Line Items]
Gain (loss) on sale of real estate		$ 244	$ 16,925	$ 487	$ 7,437
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property		6		6
Rentable square feet (in square feet) | ft²		376,000		376,000
Gross sales price				$ 23,575
Gain (loss) on sale of real estate				$ 487
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Real Estate Properties [Line Items]
Rentable square feet (in square feet) | ft²	177,000
Gross sales price	$ 21,299
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Richfield, VA
Real Estate Properties [Line Items]
Number of properties (in properties) | property		3		3
Rentable square feet (in square feet) | ft²		89,000		89,000
Gross sales price				$ 5,350
Gain (loss) on sale of real estate				$ 2,548
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Phoenix, AZ
Real Estate Properties [Line Items]
Number of properties (in properties) | property		1		1
Rentable square feet (in square feet) | ft²		107,000		107,000
Gross sales price				$ 4,900
Gain (loss) on sale of real estate				$ 511
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Vernon Hills, IL
Real Estate Properties [Line Items]
Number of properties (in properties) | property		1		1
Rentable square feet (in square feet) | ft²		100,000		100,000
Gross sales price				$ 2,825
Gain (loss) on sale of real estate				$ (2,816)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Windsor Mill, MD
Real Estate Properties [Line Items]
Number of properties (in properties) | property		1		1
Rentable square feet (in square feet) | ft²		80,000		80,000
Gross sales price				$ 10,500
Gain (loss) on sale of real estate				$ 244
Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property		2		2
Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event
Real Estate Properties [Line Items]
Number of properties (in properties) | property	2