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Loans Receivable - SHOP Seller Financing (Details)	1 Months Ended		12 Months Ended
	Jan. 31, 2021 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property
Loans receivable
Proceeds from sale of buildings			$ 0	$ 0	$ 335,709,000
Net cash provided by (used in) financing activities			246,450,000	647,271,000	(2,620,536,000)
Senior Housing Operating Portfolio
Loans receivable
Proceeds from sale of buildings			$ 190,000,000	$ 181,000,000	$ 394,000,000
Subsequent Event | Senior Housing Operating Portfolio
Loans receivable
Proceeds from sale of buildings	$ 230,000,000
Net cash provided by (used in) financing activities	150,000,000
Senior Housing Operating Portfolio | Subsequent Event
Loans receivable
Net cash provided by (used in) financing activities	$ 410,000,000
Senior Housing Operating Portfolio
Loans receivable
Number of assets to be sold | property			23	18	23
Redevelopment funding			$ 7,000,000
Senior Housing Operating Portfolio | Atria SHOP Portfolio
Loans receivable
Number of assets to be sold | property			4
Proceeds from sale of buildings			$ 94,000,000
Net cash provided by (used in) financing activities			$ 61,000,000
Senior Housing Operating Portfolio | Subsequent Event
Loans receivable
Number of assets to be sold | property	16
Senior Housing Operating Portfolio | Florida
Loans receivable
Number of assets to be sold | property				2
Proceeds from sale of buildings		$ 56,000,000
Net cash provided by (used in) financing activities		$ 45,000,000
Redevelopment funding				$ 10,000,000
Percent of estimated cost of redevelopment		80.00%

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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