Concentration (Details) - property	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Number of properties (in properties)	160
Number of states in which acquired properties located	30
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Tenant Concentration | U S Government, State Governments, and Other Governments
Concentration Risk [Line Items]
Concentration risk, percentage	28.50%	28.90%	35.30%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Tenant Concentration | U.S. Government
Concentration Risk [Line Items]
Concentration risk, percentage	19.70%	19.50%	25.20%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | California
Concentration Risk [Line Items]
Concentration risk, percentage	11.70%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Virginia
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Illinois
Concentration Risk [Line Items]
Concentration risk, percentage	10.80%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Washington, D.C.
Concentration Risk [Line Items]
Concentration risk, percentage	10.50%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%