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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Jan. 01, 2018 | Jan. 31, 2017
Accounting Policies [Abstract] |  |  |  |  |  |
Residency agreement term, minimum | 30 days |  |  |  |  |
Residency agreement term, maximum | 1 year |  |  |  |  |
Maximum period available for occupancy from cessation of significant construction activity | 1 year |  |  |  |  |
Maximum useful life of building and improvements | 60 years |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
HCP’s capital | $ 5,944,439 | $ 5,301,005 |  |  |  |
RIDEA II |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment ownership percentage | 40.00% |  |  |  |  | 40.00%
Fair value of equity investment |  |  |  |  |  | $ 107,000
Equity method investments | $ 0 | 259,651 |  |  |  | $ 121,000
ASU 2014-09 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
HCP’s capital |  |  |  |  | $ 79,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cumulative effect of change on beginning retained earnings |  |  |  |  | $ 30,000 |
Ancillary Service Revenue | ASU 2014-09 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Lease revenue | 40,000 | 38,000 | $ 51,000 |  |  |
Rental and related revenues, tenant recoveries |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Lease revenue | $ 157,000 | $ 142,000 | $ 134,000 |  |  |
Forecast | Minimum | ASU 2016-02 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  | $ 130,000 |  |
Right-of-use asset |  |  |  | 145,000 |  |
Forecast | Maximum | ASU 2016-02 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  | 165,000 |  |
Right-of-use asset |  |  |  | $ 180,000 |  |

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