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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 community | Sep. 30, 2018 USD ($) community | Mar. 31, 2018 USD ($) community | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) community | Dec. 31, 2018 community
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities disposed through termination of lease | community |  |  |  |  |  |  |  | 16 |
Gain (loss) on sale of assets, net |  |  | $ 579 |  | $ 9,833 |  | $ 2,723 | $ 76,586 |
Gain (loss) on facility lease termination and modification, net |  |  | $ 0 |  | (2,337) |  | (2,006) | (148,804) |
Non-cash management contract termination gain |  |  |  |  |  |  | 640 | 5,649 |
35 Communities Disposed Of Through Management Agreement | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  | 35 |  |  |  |  |
Non-cash management contract termination gain |  | $ 9,300 |  |  | $ 600 |  | $ 800 | $ 5,600 |
Variable Interest Entity, Not Primary Beneficiary, Real Estate Company | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in joint venture | $ 32,100 |  |  |  |  | $ 62,300 |  |  |
Gain (loss) on sale of assets, net |  |  |  |  |  | $ 41,700 |  |  |
Percentage ownership |  |  |  |  |  | 10.00% |  |  |
HCP, Inc. | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities acquired | community |  |  |  |  | 5 | 1 |  |  |
Number of communities formerly leases | community |  |  |  |  | 2 |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  | $ 242,800 |  |  |  |
HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  | 7 |  |  | 7 |
HCP, Inc. | 33 Communities Disposed Of Through Lease Terminations | Master Lease Transactions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  |  | 33
Assets under leases |  |  |  |  | $ 60,900 |  |  | $ 147,800 |
Financing lease obligations, carrying value |  |  |  |  | 67,300 |  |  | 160,800 |
Gain (loss) on sale of assets, net |  |  |  |  | 6,100 |  |  | $ 12,600 |
Number of communities previously subject to sale leaseback transactions | community |  |  |  |  |  |  |  | 6 |
HCP, Inc. | 7 Communities Operating Under Operating and Capital Leases | Master Lease Transactions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on facility lease termination and modification, net |  |  |  |  | $ (100) |  |  | $ 1,800 |

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