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Acquisitions, Dispositions and Other Significant Transactions - Formation of Venture with Blackstone(Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 29, 2017 USD ($) community | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Nov. 01, 2016 community
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire joint venture | $ |  |  |  | $ 186,166 | $ 3,733 |
Asset impairment | $ |  | $ 1,559 | $ 4,152 | 22,265 | 7,527 |
Change in valuation allowance | $ |  | $ 15,200 | $ 3,000 | 27,000 | $ 17,200 |
Blackstone Venture [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities acquired |  |  |  |  |  | 64
HCP, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities leased | 64 |  |  |  |  |
Term of lease | 12 years |  |  |  |  |
Formation of Blackstone Joint Venture [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Change in valuation allowance | $ |  |  |  | 85,000 |  |
Joint Venture [Member] | Blackstone Venture [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of community leasehold interests contributed | 62 |  |  |  |  |
Payments to acquire joint venture | $ | $ 179,200 |  |  | $ 179,200 |  |
Percentage ownership | 15.00% | 15.00% |  | 15.00% |  |
Number of communities managed | 60 |  |  |  |  |
Number of community leases terminated | 62 |  |  |  |  |
Carrying value of investment | $ |  | $ 66,800 |  | $ 66,800 |  |
Fair value of investment | $ |  | $ 47,100 |  | 47,100 |  |
Asset impairment | $ |  |  |  | $ 19,700 |  |
Joint Venture [Member] | Blackstone Venture [Member] | Assisted Living [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of community leases terminated | 47 |  |  |  |  |
Joint Venture [Member] | Blackstone Venture [Member] | Retirement Centers [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of community leases terminated | 8 |  |  |  |  |
Joint Venture [Member] | Blackstone Venture [Member] | CCRCs Rental [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of community leases terminated | 7 |  |  |  |  |
Joint Venture [Member] | Blackstone Venture [Member] | Senior Housing Communities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities acquired | 64 |  |  |  |  |
Purchase price | $ | $ 1,100,000 |  |  |  |  |
Joint Venture [Member] | HCP, Inc. [Member] | Blackstone Venture [Member] | Senior Housing Communities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of communities acquired | 64 |  |  |  |  |

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