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Real Estate Transactions - RIDEA II Sale Transaction (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Nov. 01, 2017	Jan. 31, 2017	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate				$ 20,815	$ 317,258
HCP/CPA/Brookdale JV
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument 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
RIDEA II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment ownership percentage				40.00%	40.00%
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%
Disposed of by Sale | RIDEA II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate		$ 99,000
RIDEA II | HCP/CPA/Brookdale JV
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt provided by entity	$ 242,000
Note receivable payment period	1 year
RIDEA II | HCP/CPA/Brookdale JV | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment ownership interest disposed			40.00%
Consideration of disposal of equity method investment			$ 91,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
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