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Real Estate Transactions - 2018 Other Dispositions (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
GBP (£)
Sep. 30, 2019
USD ($)
facility
Jun. 30, 2019
USD ($)
facility
Mar. 31, 2019
USD ($)
facility
Dec. 31, 2018
USD ($)
property
facility
Sep. 30, 2018
USD ($)
facility
Jun. 30, 2018
USD ($)
facility
Mar. 31, 2018
USD ($)
facility
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
property
Nov. 30, 2017
property
Real Estate [Line Items]                        
Proceeds from sale of buildings                 $ 0 $ 335,709    
Gain (loss) on sales of real estate   $ (784) $ 11,000 $ 8,000   $ 95,332     $ 18,708 $ 162,211    
SHOP                        
Real Estate [Line Items]                        
Number of properties disposed | facility   1 1 9 2 11 8 2        
Total consideration for disposal of real estate     $ 14,000 $ 68,000 $ 15,000 $ 76,000 $ 268,000 $ 35,000        
Gain (loss) on sales of real estate               $ 21,000        
Medical office                        
Real Estate [Line Items]                        
Number of properties disposed | facility   1 5   2 2            
Total consideration for disposal of real estate   $ 3,000 $ 15,000   $ 4,000 $ 21,000            
Senior housing triple-net                        
Real Estate [Line Items]                        
Number of properties disposed | facility       2     2          
Total consideration for disposal of real estate   $ 7,000   $ 26,000     $ 35,000          
Gain (loss) on sales of real estate             $ 25,000          
Life science                        
Real Estate [Line Items]                        
Number of properties disposed | facility           4            
Total consideration for disposal of real estate     $ 7,000     $ 269,000            
Land | Life science                        
Real Estate [Line Items]                        
Number of properties disposed | facility     1 1 1              
Total consideration for disposal of real estate       $ 35,000 $ 3,000              
Brookedale MTCA                        
Real Estate [Line Items]                        
Number of assets to be sold | property         19           19  
Assets Leased to Others | Brookedale MTCA                        
Real Estate [Line Items]                        
Proceeds from sale of buildings                     $ 377,000  
Gain (loss) on sales of real estate                     $ 40,000  
Assets Leased to Others | Brookedale MTCA | SHOP                        
Real Estate [Line Items]                        
Number of assets to be sold | property                       4
Development loan to MMCG                        
Real Estate [Line Items]                        
Proceeds from sale of development loan receivables | £ £ 11                      
UK JV                        
Real Estate [Line Items]                        
Investment ownership percentage   49.00%             49.00%