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Indebtedness (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
USD ($)
community
Sep. 30, 2019
USD ($)
building
loan
property
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
building
loan
property
Sep. 30, 2018
USD ($)
Nov. 06, 2019
USD ($)
Dec. 31, 2018
USD ($)
Indebtedness              
Total real estate properties, gross   $ 7,844,812,000   $ 7,844,812,000     $ 7,876,300,000
Unsecured revolving credit facility   589,000,000   589,000,000     $ 139,000,000
Loss on early extinguishment of debt   0 $ (108,000) 17,000 $ 22,000    
Unsecured revolving credit facility              
Indebtedness              
Unsecured revolving credit facility, maximum borrowing capacity   1,000,000,000   1,000,000,000      
Line of credit facility, periodic payment, principal       0      
Maximum borrowing capacity that may be increased (up to)   $ 2,000,000,000   $ 2,000,000,000      
Revolving credit facility, interest rate payable (as a percent)   3.10%   3.10%      
Weighted average interest rate on debt (as a percent)   3.50% 3.20% 3.50% 2.90%    
Unsecured revolving credit facility   $ 589,000,000   $ 589,000,000      
Revolving credit facility, available amount   411,000,000   $ 411,000,000      
Unsecured revolving credit facility | LIBOR              
Indebtedness              
Interest rate added to the base rate (as a percent)       1.20%      
Debt instrument, facility fee (as a percent)       0.25%      
Unsecured revolving credit facility | Subsequent Event              
Indebtedness              
Unsecured revolving credit facility           $ 517,000,000  
Revolving credit facility, available amount           $ 483,000,000  
Term loan due 2020              
Indebtedness              
Debt face amount   350,000,000   $ 350,000,000      
Maximum borrowing capacity that may be increased (up to)   $ 700,000,000   $ 700,000,000      
Weighted average interest rate on debt (as a percent)   3.70% 3.50% 3.90% 3.30%    
Interest rate (as a percent)   3.50%   3.50%      
Term loan due 2020 | LIBOR              
Indebtedness              
Interest rate added to the base rate (as a percent)       1.40%      
Term loan due 2022              
Indebtedness              
Debt face amount   $ 200,000,000   $ 200,000,000      
Weighted average interest rate on debt (as a percent)   3.60% 3.50% 3.80% 3.30%    
Interest rate (as a percent)   3.40%   3.40%      
Term loan due 2022 | LIBOR              
Indebtedness              
Interest rate added to the base rate (as a percent)       1.35%      
Mortgages              
Indebtedness              
Aggregate principal amount of mortgage debt   $ 690,022,000   $ 690,022,000      
Number of buildings mortgaged | building   10   10      
Total real estate properties, gross   $ 969,501,000   $ 969,501,000      
Capital leases              
Indebtedness              
Number of buildings mortgaged | property   2   2      
Total real estate properties, gross   $ 35,823,000   $ 35,823,000      
Lease obligations   9,120,000   9,120,000      
Senior Unsecured Notes Due 2019              
Indebtedness              
Maximum borrowing capacity that may be increased (up to)   400,000,000   400,000,000      
Interest rate (as a percent) 3.25%            
Principal amount plus accrued and unpaid interest $ 400,000,000            
Extinguishment of debt, accrued and interest payable 6,500,000            
Loss on early extinguishment of debt       17,000      
Senior Unsecured Note Due July 2019              
Indebtedness              
Debt face amount $ 42,211,000            
Interest rate (as a percent) 3.79%            
Number Of communities | community 4            
Unsecured Debt              
Indebtedness              
Debt face amount   1,850,000,000   1,850,000,000      
Term Loan [Member]              
Indebtedness              
Debt face amount   $ 550,000,000   $ 550,000,000      
Number of loans | loan   2   2