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Acquisitions, Dispositions and Other Significant Transactions - HCP Master Lease Transaction and RIDEA Ventures Restructuring (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) community | Nov. 01, 2017 community joint_venture | Apr. 30, 2018 USD ($) community | Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) joint_venture | Mar. 31, 2019 USD ($) lease community | Mar. 31, 2018 USD ($) | Dec. 31, 2019 community | Dec. 31, 2018 USD ($) community | Mar. 31, 2019 USD ($) lease
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities leased | lease |  |  |  |  |  |  | 251 |  |  |  | 251
Gain (loss) on sale of assets, net | $ |  |  |  |  |  |  | $ (702) | $ 43,431 |  |  |
Non-cash management contract termination fee | $ |  |  |  |  |  |  | $ 353 | $ 2,242 |  |  |
Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual rent reduction | $ | $ 2,500 |  |  |  |  |  |  |  |  |  |
Number of communities with rent reduction | 2 |  |  |  |  |  |  |  |  |  |
RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities management is retained |  |  | 18 |  |  |  |  |  |  |  |
HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities acquired |  |  |  |  |  |  |  |  |  | 2 |
Payment to acquire leased assets | $ |  |  |  |  |  |  |  |  |  | $ 35,400 |
Number of communities leased |  |  |  |  |  |  |  |  |  | 43 |
HCP, Inc. | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities acquired |  |  | 3 |  | 1 |  |  |  |  |  |
Payments to acquire asset from joint venture | $ |  |  | $ 207,400 |  | $ 32,100 |  |  |  |  |  |
RIDEA Ventures | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage ownership |  |  |  | 10.00% |  | 10.00% |  | 10.00% |  |  |
Number of joint ventures | joint_venture |  | 2 |  |  |  | 1 |  |  |  |  |
Proceeds from sale of joint venture interest | $ |  |  |  | $ 62,300 |  | $ 32,100 |  |  |  |  |
Gain (loss) on sale of assets, net | $ |  |  |  | $ 41,700 |  |  |  |  |  |  |
Number of communities managed |  | 59 |  |  |  |  |  |  |  |  |
33 Communities Disposed Of Through Lease Terminations | HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  |  |  |  | 33 |
37 Communities Disposed Of Through Operations and or Management Termination | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  | 37 |  |  |  |
34 Communities Disposed Of Through Management Termination | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  | 34 |  |  |  |
Non-cash management contract termination fee | $ |  |  |  |  |  |  | $ 400 | $ 2,200 |  |  | $ 9,100
3 Communities Disposed Of Through Management Termination | Forecast | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of |  |  |  |  |  |  |  |  | 3 |  |

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