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Debt - Mortgage Debt (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2020 USD ($) property | Jul. 31, 2019 USD ($) property | Jun. 30, 2019 property | May 31, 2019 USD ($) property | Apr. 30, 2019 property | Dec. 31, 2020 USD ($) facility | Dec. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | $ 6,346,370 |  |
Weighted-average interest rate (as a percent) |  |  |  |  |  | 0.30% | 2.04% |
Senior Housing |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 1 |  |  |  |  |
Senior Housing |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired | property | 1 |  |  |  |  |  |  |
Senior Housing | Senior Housing |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired | property |  | 5 |  | 3 | 9 |  |  |
Mortgage Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 36,000 | $ 112,000 |  | $ 50,000 |  | $ 216,780 | $ 12,000 |
Number of healthcare facilities used to secure debt (in facilities) | facility |  |  |  |  |  | 6 | 4 |
Debt instrument, collateral, healthcare facilities carrying value |  |  |  |  |  | $ 517,000 | $ 38,000 |
Debt instrument, periodic payment, principal |  |  |  |  |  | $ 18,000 | $ 4,000 | $ 5,000
Weighted-average interest rate (as a percent) | 3.87% | 4.89% |  | 4.83% |  | 3.73% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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