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Dispositions of Real Estate and Discontinued Operations - RIDEA II Sale Transaction (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2018 | Jun. 30, 2018 | Jan. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  | $ 95,000 | $ 25,000 |  | $ 925,985 | $ 356,641 | $ 164,698 |
HCP/CPA/Brookdale JV |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Debt provided |  |  | $ 602,000 |  |  |  |  |  |  |
Debt provided by third-party |  |  | 360,000 |  |  |  |  |  |  |
Debt provided by entity |  |  | 242,000 |  |  |  |  |  |  |
Net proceeds from the RIDEA II transaction |  |  | $ 480,000 |  |  |  |  |  |  |
HCP/CPA/Brookdale JV | RIDEA II |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Debt provided by entity |  |  |  |  |  |  |  |  |  | $ 242,000
Equity method investment ownership interest disposed | 40.00% |  |  |  |  |  |  |  |  |
Consideration receivable from sale of ownership interest |  |  |  |  |  |  |  |  |  | $ 91,000
Proceeds from sale of asset |  | $ 332,000 |  |  |  |  |  |  |  |
RIDEA II |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 40.00% |  |  |  | 40.00% |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  | $ 99,000 |  |  |  |
RIDEA II | HCP/CPA/Brookdale JV |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 40.00% |  |  |  |  |  |  |

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