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Assets Held For Sale and Impairment (Details)	1 Months Ended	12 Months Ended
Assets Held For Sale and Impairment (Details)	Mar. 31, 2018 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		1,200
Assets held for sale		$ 91,433,000	$ 5,454,000
Liabilities held for sale		5,463,000	205,000
Real estate impairments		0	52,510,000	$ 4,616,000
Depreciation and amortization
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairments		133,600,000	29,500,000	32,900,000
Other Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairments		0	52,500,000	$ 4,600,000
Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties no longer classified as held for sale \| property	5
Depreciation	$ 5,700,000
Triple Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		62,098,000	5,482,000
Liabilities held for sale		1,623,000	40,000
Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		5,177,000	160,000
Liabilities held for sale		499,000	152,000
Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		24,158,000	(188,000)
Liabilities held for sale		$ 3,341,000	$ 13,000
Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		15	1
Held for Sale \| Triple Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		8	1
Held for Sale \| Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		1	0
Held for Sale \| Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		6	0