Dispositions of Real Estate and Discontinued Operations - Assets and Liabilities for Discontinued Operations (Details) $ in Thousands	Jun. 30, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
ASSETS
Cash and cash equivalents	$ 8,070	$ 7,707	$ 17,354	$ 53,085
Total assets of discontinued operations, net	66,647	37,190
LIABILITIES
Total liabilities of discontinued operations, net	15,869	15,056
Allowance for doubtful accounts receivable	990	4,138
Held-for-sale
ASSETS
Accounts receivable, net of allowance of $990 and $4,138	761	2,446
Cash and cash equivalents	8,070	7,707
Right-of-use asset, net	19	26
Other assets, net	1,400	3,237
Total assets of discontinued operations, net	10,250	13,416
Assets held for sale, net	56,397	23,774
Assets held for sale and discontinued operations, net	66,647	37,190
LIABILITIES
Lease liability	19	26
Accounts payable, accrued liabilities, and other liabilities	11,479	14,843
Deferred revenue	102	92
Total liabilities of discontinued operations, net	11,600	14,961
Liabilities related to assets held for sale, net	4,269	95
Liabilities related to assets held for sale and discontinued operations, net	$ 15,869	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	2	4
Held-for-sale | Life Science and Medical Office
LIABILITIES
Net real estate assets	$ 51,000