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Dispositions of Property (Details) $ in Thousands								12 Months Ended
	Nov. 16, 2021 USD ($) property	Oct. 22, 2021 USD ($)	Sep. 23, 2021 USD ($) property	Aug. 31, 2021 USD ($)	Jun. 29, 2021 USD ($)	May 27, 2021 USD ($) property	Dec. 23, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Dispositions of properties
Gain (loss) on sale of property								$ 113,134	$ 41,928
Office Properties in Atlanta, Georgia
Dispositions of properties
Number of properties sold | property						3
Gain (loss) on sale of property		$ 86,800				$ 22,800
Sale price		$ 223,900				$ 219,500
Office Property in Dulles, Virginia
Dispositions of properties
Gain (loss) on sale of property					$ (2,100)
Sale price					$ 17,300
Office property in Indianapolis, Indiana
Dispositions of properties
Gain (loss) on sale of property				$ (1,700)
Sale price				$ 35,000
Office properties in Chesterfield, MO
Dispositions of properties
Number of properties sold | property			2
Gain (loss) on sale of property			$ 10,300
Sale price			$ 67,000
Office property in Chantilly, VA
Dispositions of properties
Number of properties sold | property	2
Gain (loss) on sale of property	$ (2,900)
Sale price	$ 40,000
Office Property In Durham North California
Dispositions of properties
Gain (loss) on sale of property							$ 41,900
Sale price							$ 89,700
Disposal group disposed of by sale, not classified as discontinued operations
Operating results for discontinued operations:
Rental revenue								38,958	72,967	$ 74,626
Rental operating expenses								(11,518)	(20,651)	(22,867)
Real estate taxes and insurance								(5,654)	(11,165)	(10,851)
Depreciation and amortization								(11,929)	(26,552)	(26,927)
Net income (loss) from discontinued operations								$ 9,857	$ 14,599	$ 13,981

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Amount of real estate taxes and insurance attributable to disposal group, but not limited to, discontinued operation.

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Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal.

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