Dispositions of Real Estate and Discontinued Operations - Assets and Liabilities for Discontinued Operations (Details) $ in Thousands	Sep. 30, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
ASSETS
Cash and cash equivalents	$ 2,172	$ 7,707	$ 14,005	$ 53,085
Total assets of discontinued operations, net	51,495	37,190
LIABILITIES
Total liabilities of discontinued operations, net	12,831	15,056
Allowance for doubtful accounts receivable	260	4,138
Held-for-sale
ASSETS
Accounts receivable, net of allowance of $260 and $4,138	367	2,446
Cash and cash equivalents	2,172	7,707
Right-of-use asset, net	0	26
Other assets, net	285	3,237
Total assets of discontinued operations, net	2,824	13,416
Assets held for sale, net	48,671	23,774
Assets held for sale and discontinued operations, net	51,495	37,190
LIABILITIES
Lease liability	0	26
Accounts payable, accrued liabilities, and other liabilities	8,668	14,843
Deferred revenue	0	92
Total liabilities of discontinued operations, net	8,668	14,961
Liabilities related to assets held for sale, net	4,163	95
Liabilities related to assets held for sale and discontinued operations, net	$ 12,831	15,056
Net real estate assets		$ 23,000
Held-for-sale | Life Science
LIABILITIES
Number of properties classified as held for sale | property	2	1
Held-for-sale | Medical Office Buildings
LIABILITIES
Number of properties classified as held for sale | property		4
Held-for-sale | Life Science and Medical Office
LIABILITIES
Net real estate assets	$ 43,000