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Real Estate Transactions - RIDEA II Sale Transaction (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2018
Jan. 31, 2017
Mar. 31, 2019
Sep. 30, 2018
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     $ 8,044 $ 95,000 $ 25,000 $ 20,815  
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%
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       242,000    
Equity method investment ownership interest disposed 40.00%            
Consideration of disposal of equity method investment $ 91,000       $ 91,000    
Proceeds from sale of ownership interest $ 332,000