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Brookdale Lease Amendments and Terminations and the Formation of Two RIDEA Joint Ventures (“Brookdale Transaction”) - Continuing Care Retirement Communities Joint Venture (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 29, 2014 USD ($) item | Dec. 31, 2015 USD ($)
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Joint Venture Ownership Percentage | 49.00% |
Joint Venture Disclosures [Abstract] |  |
Cash contributed | $ |  | $ 770,325
Brookdale Senior Living |  |
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Joint Venture Ownership Percentage | 20.00% |
CCRC JV |  |
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Number of retirement communities | 14 |
Joint Venture Disclosures [Abstract] |  |
Number of retirement communities contributed to joint venture | 2 |
Fair value of retirement communities or properties contributed | $ | $ 162,000 |
Carrying value of properties contributed | $ | 92,000 |
Cash contributed | $ | 370,000 |
Debt related to retirement communities or properties contributed | $ | $ 569,000 |
CCRC JV | Brookdale Senior Living |  |
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Joint Venture Ownership Percentage | 51.00% |
Joint Venture Disclosures [Abstract] |  |
Number of retirement communities contributed to joint venture | 8 |
Number of properties intended to be acquired in future | 4 |
CCRC JV | CCRCJV Prop Co | Brookdale Senior Living |  |
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Number of properties to be leased | 8 |
CCRC JV | CCRCJV Op Co | Brookdale Senior Living |  |
Lease Amendments And Terminations And Joint Venture Formations [Line Items] |  |
Number of properties to be owned directly | 6 |

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