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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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- Definition Percent of Estimated Cost of Redevelopment + References No definition available. + Details
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- Definition Redevelopment Funding, Amount Committed + References No definition available. + Details
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- Definition 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 + Details
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