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Intangibles - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Jan. 31, 2020 facility | Jan. 31, 2020 property | Oct. 31, 2019 property | Jan. 01, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average remaining amortization period in years | 6 years | 5 years |  |  |  |
Weighted average remaining amortization period in years | 8 years | 7 years |  |  |  |
Intangible assets, net | $ 501,583 | $ 331,693 |  |  |  |
Intangible liabilities, net | 108,031 | 74,991 |  |  |  |
Held-for-sale |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, held for sale | 14,000 | $ 11,000 |  |  |  |
Accounting Standards Update 2016-12 |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  | $ 39,000
Intangible liabilities, net |  |  |  |  |  | $ 6,000
Brookedale MTCA |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets acquired | 298,000 |  |  |  |  |
Intangible liabilities acquired | $ 42,000 |  |  |  |  |
Weighted average remaining amortization period in years | 7 years |  |  |  |  |
Weighted average remaining amortization period in years | 10 years |  |  |  |  |
Brookedale MTCA | CCRC JV |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Property count | property |  |  |  | 15 |  |
Other non-reportable | CCRC JV | Assets Leased to Others |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Property count |  |  | 15 | 15 | 15 |
Other non-reportable | Brookedale MTCA | CCRC JV | Assets Leased to Others |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Property count | 13 |  | 13 | 13 |  |

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