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Summary of Significant Accounting Policies (Details) $ in Thousands |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Mar. 31, 2019 USD ($) facility | Mar. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | [2] | Mar. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment to equity |  | $ 5,836,882 |  |  |  | $ 5,944,439 |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  | 590 | [1] | $ 79,144 |
Present value of lease liabilities |  | 152,837 |  |  |  | 0 |  |  |
Right-of-use asset |  | 165,748 |  |  |  | $ 0 |  |  |
RIDEA II |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  | 40.00%
Equity method investments | $ 121,000 |  |  |  |  |  |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect adjustment to equity | 79,000 |  |  |  |  |  |  |  |
Impairment charge | 30,000 |  |  |  |  |  |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | RIDEA II |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value of equity method investments | $ 107,000 |  |  |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Present value of lease liabilities |  |  |  | $ 153,000 |  |  |  |  |
Right-of-use asset |  |  |  | 166,000 |  |  |  |  |
Accrued straight-line rent liability |  |  |  | 20,000 |  |  |  |  |
Unamortized lease intangibles |  |  |  | 33,000 |  |  |  |  |
Ancillary service revenue | ASU 2014-09 |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Tenant recoveries and Resident fees and services |  | $ 10,000 | $ 10,000 |  |  |  |  |  |
Tenant recoveries |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Rental and related revenues |  |  | $ 37,000 |  |  |  |  |  |
Medical office |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of facilities transitioned | facility |  | 2 |  |  |  |  |  |  |
Cumulative Dividends In Excess Of Earnings |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  | $ 590 | [1] |  |  | $ 79,144 |
[1] | On January 1, 2019, the Company adopted a series of Accounting Standards Updates (“ASUs”) related to accounting for leases, and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.
[2] | On January 1, 2018, the Company adopted ASU No. 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets (“ASU 2017-05”), and recognized the cumulative-effect of adoption to beginning retained earnings. Refer to Note 2 for a detailed impact of adoption.

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