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Real Estate Transactions - RIDEA II Sale Transaction (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Nov. 01, 2017
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     $ 46,064 $ 412 $ 66,879 $ 317,670    
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%   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  
Equity method investment ownership interest disposed     40.00%          
Consideration of disposal of equity method investment $ 90,000   $ 90,000   $ 90,000      
Proceeds from sale of ownership interest $ 332,000