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Dispositions and Assets Held for Sale - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
[1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Real property held for sale $ 336,649 $ 336,649 $ 590,271
Seniors Housing Operating      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of properties classified as held for sale | property 12 12  
Triple-net      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of properties classified as held for sale | property 8 8  
Outpatient Medical      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of properties classified as held for sale | property 5 5  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Benchmark Senior Living Portfolio      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gross sale price $ 1,800,000 $ 1,800,000  
Gain on sale 520,000    
Held for sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Real property held for sale 336,649 336,649  
Secured debt 24,338 24,338  
Net other assets and liabilities $ 7,608 7,608  
Net impairment charges   13,121  
Net impairment charges related to held for use properties   $ 14,914  
Carrying value exceeded the sum of the future undiscounted cash flows | property 5 5  
Unsecured debt | Benchmark Senior Living Portfolio      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Extinguishment of debt $ 1,000,000    
Secured Debt | Benchmark Senior Living Portfolio      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Extinguishment of debt $ 24,000    
[1] The consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.