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Indebtedness - Narrative (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2020
USD ($)
community
May 31, 2019
USD ($)
community
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
property
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
property
Feb. 28, 2020
USD ($)
Sep. 30, 2018
USD ($)
property
Jul. 31, 2018
USD ($)
property
Jan. 31, 2018
USD ($)
property
May 31, 2017
USD ($)
property
Apr. 30, 2017
USD ($)
property
Mar. 31, 2017
Debt Instrument [Line Items]                                
Mortgage debt assumed             $ 0 $ 44,386,000 $ 0              
Unsecured revolving credit facility             537,500,000 139,000,000                
Loss on early extinguishment of debt             44,000 $ 22,000 $ 7,627,000              
Unsecured Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Unsecured revolving credit facility, maximum borrowing capacity             1,000,000,000                  
Maximum borrowing capacity that may be increased             $ 2,000,000,000                  
Revolving credit facility, interest rate payable (as a percent)             2.80%                  
Weighted average interest rate on debt (as a percent)             3.40% 3.00% 2.40%              
Unsecured revolving credit facility             $ 537,500,000                  
Revolving credit facility, available amount             462,500,000                  
Unsecured Revolving Credit Facility | Forecast                                
Debt Instrument [Line Items]                                
Unsecured revolving credit facility                   $ 593,000,000            
Revolving credit facility, available amount                   $ 407,000,000            
Senior unsecured notes due 2019                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)   325.00%                            
Loss on early extinguishment of debt           $ 17,000                    
Debt extinguishment, amount   $ 400,000                            
Debt extinguishment, accrued and interest payable   6,500,000                            
Senior Unsecured Note Due July 2019                                
Debt Instrument [Line Items]                                
Principal amount of debt   $ 42,211,000                            
Interest rate (as a percent)   3.79%                            
Number of communities | community   4                            
Senior unsecured notes due 2028                                
Debt Instrument [Line Items]                                
Principal amount of debt         $ 500,000                      
Interest rate (as a percent)         4.75%                      
Unsecured Notes Due June 2023                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)         6.64%                      
Mortgage debt assumed         $ 16,748,000                      
Unsecured Notes Due June 2023 | Senior Living Communities                                
Debt Instrument [Line Items]                                
Number of properties mortgaged | property         1                      
Unsecured Notes Due July 2043                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)               4.44%                
Mortgage debt assumed       $ 11,050,000                        
Unsecured Notes Due July 2043 | Office Portfolio                                
Debt Instrument [Line Items]                                
Number of properties mortgaged | property               1                
Senior Notes Due October 2022                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)               5.75%                
Mortgage debt assumed     $ 16,588,000                          
Senior Notes Due October 2022 | Senior Living Communities                                
Debt Instrument [Line Items]                                
Number of properties mortgaged | property               2                
Term loan due 2020                                
Debt Instrument [Line Items]                                
Principal amount of debt             $ 250,000,000                  
Interest rate (as a percent)             2.90%                  
Weighted average annual interest rate (as a percent)             2.90%                  
Loss on early extinguishment of debt             $ 27,000                  
Term loan due 2020 | LIBOR                                
Debt Instrument [Line Items]                                
Basis points per annum (as a percent)             1.25%                  
Unsecured term loan due January 2020                                
Debt Instrument [Line Items]                                
Principal amount of debt             $ 350,000,000                  
Term loan due 2022                                
Debt Instrument [Line Items]                                
Principal amount of debt             $ 200,000,000                  
Interest rate (as a percent)             3.20%                  
Weighted average annual interest rate (as a percent)             3.70%                  
Maximum borrowing capacity that may be increased             $ 400,000,000                  
Weighted average interest rate on debt (as a percent)               3.40% 2.70%              
Term loan due 2022 | LIBOR                                
Debt Instrument [Line Items]                                
Basis points per annum (as a percent)             1.35%                  
Mortgage maturing in September 2043                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)                         4.40%      
Secured debt                         $ 4,338,000      
Number of properties mortgaged | property                         1      
Senior Unsecured Notes Due October 2018                                
Debt Instrument [Line Items]                                
Principal amount of debt                       $ 90,602,000        
Number of properties mortgaged | property                       12        
Weighted average interest rate on debt (as a percent)                       5.00%        
Senior Unsecured Notes Due January 2019                                
Debt Instrument [Line Items]                                
Principal amount of debt                     $ 6,325,000          
Interest rate (as a percent)                     4.70%          
Number of properties mortgaged | property                     1          
Loss on early extinguishment of debt               $ 22,000                
Senior Unsecured Notes Due September 2019                                
Debt Instrument [Line Items]                                
Principal amount of debt                             $ 5,449,000  
Interest rate (as a percent)                             6.71%  
Secured debt                             $ 277,837,000  
Number of properties mortgaged | property                             17  
Senior Unsecured Notes Due August 2017                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)                           6.15%    
Secured debt                           $ 10,579,000    
Number of properties mortgaged | property                           1    
Senior Unsecured Notes Due August 2037                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)               5.95%                
Secured debt               $ 8,807,000                
Number of properties mortgaged | property               1                
Senior Unsecured Notes Due April 2018                                
Debt Instrument [Line Items]                                
Interest rate (as a percent)                 6.73%              
Secured debt                 $ 8,403,000              
Number of properties mortgaged | property                 1              
Loss on early extinguishment of debt                 $ 7,627,000              
Revolving Credit Facility | Unsecured Revolving Credit Facility | LIBOR                                
Debt Instrument [Line Items]                                
Basis points per annum (as a percent)             1.20%                  
Loan commitment fee percentage             0.25%                  
Joint Venture                                
Debt Instrument [Line Items]                                
Ownership interest by parent                               55.00%
Subsequent Event | Senior Unsecured Notes Due March 2026                                
Debt Instrument [Line Items]                                
Principal amount of debt $ 1,554,000                              
Interest rate (as a percent) 6.25%                              
Number of communities | community 1