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Master Transactions and Cooperation Agreement with Brookdale (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Oct. 01, 2018 USD ($) property | Nov. 01, 2017 USD ($) property agreement | Aug. 02, 2018 property | Jun. 30, 2018 USD ($) property | Apr. 30, 2018 USD ($) property | Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) property | Dec. 31, 2018 property | Sep. 30, 2018 USD ($) property facility | Jun. 30, 2018 USD ($) property facility | Mar. 31, 2018 USD ($) facility | Dec. 31, 2017 USD ($) facility | Sep. 30, 2017 USD ($) facility | Mar. 31, 2017 USD ($) facility | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) property
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ |  | $ 95,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquired noncontrolling interest | $ |  |  |  |  |  | $ 63,000 |  | $ 32,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of RIDEA facilities | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 335,709 | $ 462,242 |
Number of properties classified as held for sale |  |  |  | 13 |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |
CCRC JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  | 49.00% |  |
RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned out |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |
Number of assets to be sold |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  | 19 |  |
Number of properties classified as held for sale |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  | 19 |  |
Assets Leased to Others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  | 58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of RIDEA facilities | $ |  |  |  | $ 428,000 |  |  |  |  |  |  | $ 377,000 |  |  |  |  |  |  |  |
Nonrefundable deposit in RIDEA facilities sale | $ |  |  |  | $ 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  |  | 64 |  |  | 2 |  | 2 | 2 |  |  |  |
Total consideration for disposal of real estate | $ |  |  |  |  |  |  |  |  | $ 1,125,000 |  |  | $ 35,000 |  | $ 12,000 | $ 15,000 |  |  |  |
Senior housing triple-net | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties with right to sell or transition to other operator |  | 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to sell and transfer period for operating leases |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties transitioned to cash flow leases expiration period |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of annual rent cut | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Number of assets with annual rent cut |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of properties sold |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for disposal of real estate | $ |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned out |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |
Number of assets to be sold |  |  |  | 11 |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | facility |  |  |  |  |  |  |  |  |  |  | 11 | 8 | 2 | 4 |  | 1 |  |  |
Total consideration for disposal of real estate | $ |  |  |  |  |  |  |  |  |  |  | $ 76,000 | $ 268,000 | $ 35,000 | $ 41,000 |  | $ 3,000 |  |  |
SHOP | CCRC JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  | 49.00% |  |
SHOP | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets transitioned out |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |
SHOP | Assets Leased to Others | RIDEA Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  | 3 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Management termination period |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percentage of gross revenue |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of annual increase in management fee |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee annual rent increase period |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets to be sold |  | 4 |  | 11 |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
Total consideration for disposition of real estate | $ |  | $ 240,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of productive assets | $ |  |  |  |  | $ 208,000 |  | $ 32,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of assets under management agreement |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreement with termination rights | agreement |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management agreements with termination rights period |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties removed from the sale transaction |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
SHOP | Assets Leased to Others | RIDEA Facilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percentage of gross revenue |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHOP | Assets Leased to Others | Separate RIDEA structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets under management agreement |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookdale | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brookdale Senior Living Inc. | SHOP | CCRC JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by Parent |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  | 51.00% |  |
Subsequent Event | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for disposal of real estate | $ | $ 263,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |

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