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Description of Business (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
Description of Business (Details) $ in Thousands	Mar. 31, 2018 USD ($)	Feb. 18, 2021 USD ($)	Dec. 31, 2020 USD ($) property tenant	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) property tenant	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Real estate properties
Number of real estate properties \| property			1,200		1,200
Real estate impairments related to natural disasters					$ 0	$ 0	$ 52,510
Real Estate Investments, Net			$ 21,599,290		21,599,290	22,484,207
Equity Method Investment, Other than Temporary Impairment	$ 35,700
Deferred Tax Assets, Valuation Allowance			127,279		127,279	40,114	$ 80,614
Commercial Paper			0		0	$ 567,450
Subsequent Event
Real estate properties
Commercial Paper		$ 0
Revolving Credit Facility \| Unsecured Debt
Real estate properties
Line of credit, remaining availability less commercial paper			2,900,000		2,900,000
Revolving Credit Facility \| Unsecured Debt \| Subsequent Event \| Cash and Cash Equivalents [Member]
Real estate properties
Available liquidity, including remaining available on line of credit and cash on hand		3,000,000
COVID-19 Impact
Real estate properties
Allowance for Loan and Lease Losses, Write-offs					74,600
Real estate impairments related to natural disasters					$ 126,500
Impairment Of Real Estate Percent Of Total					1.00%
Equity Method Investment, Other than Temporary Impairment				$ 10,700	$ 10,700
Deferred Tax Assets, Valuation Allowance			56,400		56,400
HHS Grants received from Phase II of Provider Relief Fund			34,300
Grants received from Phase III of Provider Relief Fund			800
Financing Receivable, Allowance for Credit Loss, Writeoff					34,700
Financing Receivable, Allowance for Credit Loss			10,500		10,500
COVID-19 Impact \| Subsequent Event
Real estate properties
Grants received from Phase III of Provider Relief Fund		$ 13,600
COVID-19 Impact \| Fair Value
Real estate properties
Real Estate Investments, Net			$ 239,900		$ 239,900
Brookdale Senior Living
Real estate properties
Number of real estate properties \| property			121		121
Concentration risk, number of tenants \| tenant			3		3
Number of properties managed by large tenant excluded from property count for that tenant due to contract type \| property			8		8
Ardent
Real estate properties
Number of real estate properties \| property			12		12
Kindred
Real estate properties
Number of real estate properties \| property			32		32
Seniors Housing Communities
Real estate properties
Number of independent third party managed properties \| property			441		441
Triple-net leased properties
Real estate properties
Number of real estate properties \| property			366		366