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Real Estate Transactions - Impairments of Real Estate (Details)
$ / item in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
property
$ / item
Mar. 31, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
property
Jun. 30, 2019
USD ($)
$ / item
Jun. 30, 2018
USD ($)
property
Dec. 31, 2018
USD ($)
Real Estate [Line Items]            
Impairments (recoveries), net $ 59,000     $ 77,396 $ 13,912  
Real estate carrying value 164,000     164,000    
Casualty-related loss (recoveries), net 6,000     6,579   $ 0
Deferred tax liabilities, deferred expense $ 300     300    
Number of properties classified as held for sale (in properties) | property     13   13  
Senior housing triple-net            
Real Estate [Line Items]            
Number of real estate properties impaired (in properties) | property 2          
Senior Housing            
Real Estate [Line Items]            
Number of real estate properties impaired (in properties) | property 14          
Medical office            
Real Estate [Line Items]            
Number of real estate properties impaired (in properties) | property 1 2        
Impairments (recoveries), net   $ 9,000        
Medical office and senior housing            
Real Estate [Line Items]            
Selling expense $ 105,000     $ 105,000    
SHOP            
Real Estate [Line Items]            
Impairments (recoveries), net $ 10,000          
Properties classified as held for sale (in properties) | property     2      
Impairment of real estate     $ 14,000      
Minimum            
Real Estate [Line Items]            
Impairment test, market capitalization rate 4.97%     4.97%    
Impairment calculation, price per unit | $ / item 52     52    
Maximum            
Real Estate [Line Items]            
Impairment test, market capitalization rate 6.64%     6.64%    
Impairment calculation, price per unit | $ / item 90     90    
Weighted Average            
Real Estate [Line Items]            
Impairment test, market capitalization rate 5.41%     5.41%    
Impairment calculation, price per unit | $ / item 62     62