v3.5.0.2
DISPOSITIONS - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
installment
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
property
installment
Sep. 30, 2015
USD ($)
property
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on real estate dispositions, net $ 0 $ (48,000) $ (1,000) $ 229,000  
Impairment of real estate 0 2,500,000 14,500,000 31,300,000  
Impairment of long-lived assets to be disposed of     0 13,000,000  
2016 Dispositions          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from disposition of assets, including termination fees     63,800,000    
Gain on real estate dispositions, net     $ 31,800,000    
2016 Dispositions | Triple-Net Leased Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties sold | property     3    
2016 Dispositions | Seniors Housing Communities | Office Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties sold | property     1    
2016 Dispositions | Medical Office Buildings | Office Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties sold | property     25    
2015 Dispositions          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from disposition of assets, including termination fees       436,000,000  
Gain on real estate dispositions, net       32,800,000  
Lease termination fees       6,000,000  
Deferred gain on sale of property   $ 18,100,000   $ 18,100,000  
Deferred gain on sale of property, term         5 years
2015 Dispositions | Triple-Net Leased Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties sold | property       32  
2015 Dispositions | Medical Office Buildings | Office Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties sold | property       1  
CCP          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Amount charge for Service Fee     $ 2,500,000    
Durations of services provided     1 year    
Income related to Service Fee $ 400,000   $ 1,600,000    
Number of quarterly installments | installment 4   4