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Indebtedness (Details)	1 Months Ended		3 Months Ended
	Apr. 29, 2022 USD ($) property	Feb. 28, 2022 USD ($)	Mar. 31, 2022 USD ($) property	Mar. 31, 2021 USD ($)	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Indebtedness
Number of properties (property) | property			378
Total real estate properties, gross			$ 6,413,183,000				$ 6,813,556,000
Repayments of Lines of Credit			100,000,000	$ 0
Gain (Loss) on Extinguishment of Debt			$ 483,000	$ 2,040,000
Debt ratio			150.00%
Finance Leased Properties
Indebtedness
Number of properties (property) | property			2
Finance lease obligations			$ 6,321,000
Finance leased asset, gross			37,024,000				36,730,000
Finance leased asset, accumulated depreciation			18,418,000				$ 18,203,000
Unsecured revolving credit facility
Indebtedness
Unsecured revolving credit facility, maximum borrowing capacity		$ 700,000,000	$ 700,000,000			$ 800,000,000
Revolving credit facility, interest rate payable (as a percent)			3.00%
Debt instrument, facility fee (as a percent)			0.30%
Weighted average interest rate on debt (as a percent)			2.90%	2.90%
Repayments of Lines of Credit		100,000,000
Gain (Loss) on Extinguishment of Debt			$ 483,000
Capital expenditure		400,000,000
Minimum liquidity requirement		$ 200,000,000
Unsecured revolving credit facility | Forecast
Indebtedness
Unsecured revolving credit facility, maximum borrowing capacity					$ 586,373,000
Unsecured revolving credit facility | LIBOR | Revolving Credit Facility
Indebtedness
Basis points per annum (as a percent)		0.15%
Unsecured revolving credit facility | Medical Office And Life Science
Indebtedness
Number of properties (property) | property			61
Total real estate properties, gross			$ 994,281,000
Mortgages
Indebtedness
Aggregate principal amount of mortgage debt			$ 61,976,000
Number of properties (property) | property			6
Total real estate properties, gross			$ 115,874,000
Mortgages 6.28 Percent Due July 2022 | Medical Office Building | Subsequent Event
Indebtedness
Number of properties (property) | property	1
Coupon rate (percent)	6.28%
Repayments of debt	$ 10,934,000
Unsecured Debt
Indebtedness
Debt face amount			$ 2,850,000,000

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