Real Estate Investments - Assets Held for Sale (Details) $ in Thousands	Mar. 31, 2022 USD ($) property building	Dec. 31, 2021 USD ($)
Balance Sheet Related Disclosures [Abstract]
Land	$ 427,422	$ 387,918
Building, improvements and lease intangibles	4,533,583	4,458,119
Personal property	11,639	11,761
Total real estate properties	5,187,394	5,104,942
Accumulated depreciation	(1,351,796)	(1,338,743)
Total real estate properties, net	3,835,598	3,766,199
Assets held for sale, net	14,961	57
Liabilities of assets held for sale	$ 687	294
Medical office building
Long Lived Assets Held-for-sale [Line Items]
Number of properties held for sale \| building	2
Disposal Group, Held-for-sale, Not Discontinued Operations
Balance Sheet Related Disclosures [Abstract]
Land	$ 2	0
Building, improvements and lease intangibles	40,447	0
Personal property	142	0
Total real estate properties	40,591	0
Accumulated depreciation	(26,215)	0
Total real estate properties, net	14,376	0
Other assets, net	585	57
Assets held for sale, net	14,961	57
Accounts payable and accrued liabilities	325	169
Other liabilities	362	125
Liabilities of assets held for sale	687	$ 294
Real Estate Dispositions \| San Antonio, TX
Long Lived Assets Held-for-sale [Line Items]
Disposition sales price	25,500
Sale price greater than current net investment	$ 14,400
Asset Held-for-sale
Long Lived Assets Held-for-sale [Line Items]
Number of properties held for sale \| property	2

Assets held for sale and discontinued operations, net.

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Amount classified as accounts payable and accrued liabilities attributable to disposal group held for sale or disposed of.

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