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Master Transactions and Cooperation Agreement with Brookdale (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) property | Oct. 31, 2019 USD ($) property lease | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) property facility | Mar. 31, 2017 USD ($) facility | Dec. 31, 2018 property facility | Sep. 30, 2018 facility | Jun. 30, 2018 facility | Mar. 31, 2018 facility | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property facility | Sep. 30, 2019 property | Jun. 30, 2019 property | Mar. 31, 2019 property | Jan. 01, 2018 USD ($) property
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash lease and management fee termination loss (income), net | $ |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 54,641 |  |  |  |
Payments to acquire additional interest in subsidiaries | $ |  |  | $ 63,000 | $ 32,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee rate |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Operating expenses | $ |  |  |  |  |  |  |  |  |  |  | $ 879,370 | $ 705,038 | $ 666,251 |  |  |  |
RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  | 19 |  |  |  |  | 19 |  |  |  |  |
Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  |  |
Assets leased to others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | facility |  |  |  |  | 58 |  |  |  |  |  |  |  |  |  |  |  |
Other non-reportable segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Other non-reportable segments | Assets leased to others | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Number of properties disposed | facility |  |  |  |  |  | 64 |  |  | 2 |  |  |  | 4 |  |  |  |
Total consideration for disposition of real estate | $ |  |  |  |  |  | $ 1,125,000 |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  | 43 |  |  | 78 |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Right to sell, or transition, number of properties (in properties) |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |  |  |
Rent concessions | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Number of properties with rent concessions (in properties) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Total consideration for disposition of real estate | $ |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |
Reduction in rental and related revenues | $ |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |
Fair value inputs (in properties) |  |  |  |  |  |  |  |  |  |  |  | 32 | 32 |  |  |  |
Senior housing triple-net | Assets leased to others | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  | 11 |  |  |  |  | 11 |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  |  |  |  |  | 7 |  |  | 1 | 1 | 9 |
Number of properties disposed | facility |  |  |  |  |  |  | 2 | 11 | 8 | 2 |  |  | 5 |  |  |  |
SHOP | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  |  |  | 8 |  |  |  |  | 8 |  |  |  |  |
SHOP | Assets leased to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold or transitioned |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
SHOP | Assets leased to others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | facility |  |  |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for disposition of real estate | $ |  |  |  |  | $ 240,000 |  |  |  |  |  |  |  |  |  |  |  |
SHOP | Assets leased to others | Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
SHOP | Assets Under Management Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value inputs (in properties) |  |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR growth rates |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDAR growth rates |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate |  |  |  |  |  |  | 0.12 |  |  |  |  | 0.12 |  |  |  |  |
Cap rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate |  |  |  |  |  |  | 0.06 |  |  |  |  | 0.06 |  |  |  |  |
Cap rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate capitalization rate |  |  |  |  |  |  | 0.07 |  |  |  |  | 0.07 |  |  |  |  |
Real estate | SHOP | Assets Under Management Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses | $ |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |
CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 49.00% |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |
CCRC JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of noncontrolling interest acquired |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds | $ |  | $ 385,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | 2019 Amended Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator |  | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | Assets leased to others | 2019 Amended Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of leases to be terminated (in properties) | lease |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be restructured |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of sales proceeds |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be reallocated |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of future rent to be paid | $ |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment | $ |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual percentage increase |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | Other non-reportable segments | Assets leased to others | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase cost | $ |  | $ 1,060,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash lease and management fee termination loss (income), net | $ |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Brookedale MTCA | Assets leased to others | 2019 Amended Master Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold (in properties) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash lease and management fee termination loss (income), net | $ | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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