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Indebtedness (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
USD ($)
community
Jun. 30, 2019
USD ($)
building
note
property
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
building
note
property
Jun. 30, 2018
USD ($)
Aug. 07, 2019
USD ($)
Dec. 31, 2018
USD ($)
Indebtedness              
Total real estate properties, gross   $ 7,939,588,000   $ 7,939,588,000     $ 7,876,300,000
Unsecured revolving credit facility   690,000,000   690,000,000     $ 139,000,000
Loss on early extinguishment of debt   17,000 $ 0 17,000 $ 130,000    
Unsecured revolving credit facility              
Indebtedness              
Unsecured revolving credit facility, maximum borrowing capacity   $ 1,000,000,000   $ 1,000,000,000      
Number of public issues of unsecured senior notes | note   6   6      
Line of credit facility, periodic payment, principal       $ 0      
Revolving credit facility, interest rate payable (as a percent)   3.60%   3.60%      
Weighted average interest rate on debt (as a percent)   3.60% 3.00%        
Average interest rate during period   3.60% 2.70% 3.60% 2.70%    
Unsecured revolving credit facility   $ 690,000,000   $ 690,000,000      
Revolving credit facility, available amount   310,000,000   310,000,000      
Maximum borrowing capacity that may be increased (up to)   2,000,000,000   $ 2,000,000,000      
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           $ 555,000,000  
Revolving credit facility, available amount           $ 445,000,000  
Senior unsecured notes due 2020              
Indebtedness              
Debt face amount   $ 200,000,000   $ 200,000,000      
Interest rate (as a percent)   6.75%   6.75%      
Senior unsecured notes due 2021              
Indebtedness              
Debt face amount   $ 300,000,000   $ 300,000,000      
Interest rate (as a percent)   6.75%   6.75%      
Senior unsecured notes due 2024              
Indebtedness              
Debt face amount   $ 250,000,000   $ 250,000,000      
Interest rate (as a percent)   4.75%   4.75%      
Senior unsecured notes due 2028              
Indebtedness              
Debt face amount   $ 500,000,000   $ 500,000,000      
Interest rate (as a percent)   4.75%   4.75%      
Senior unsecured notes due 2042              
Indebtedness              
Debt face amount   $ 350,000,000   $ 350,000,000      
Interest rate (as a percent)   5.625%   5.625%      
Senior unsecured notes due 2046              
Indebtedness              
Debt face amount   $ 250,000,000   $ 250,000,000      
Interest rate (as a percent)   6.25%   6.25%      
Term loan due 2020              
Indebtedness              
Debt face amount   $ 350,000,000   $ 350,000,000      
Interest rate (as a percent)   3.80%   3.80%      
Weighted average interest rate on debt (as a percent)   3.90% 3.40% 3.90% 3.20%    
Maximum borrowing capacity that may be increased (up to)   $ 700,000,000   $ 700,000,000      
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      
Interest rate (as a percent)   3.80%   3.80%      
Weighted average interest rate on debt (as a percent)   3.90% 3.30%        
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   $ 690,667,000   $ 690,667,000      
Number of buildings mortgaged | building   10   10      
Total real estate properties, gross   $ 968,463,000   $ 968,463,000      
Capital leases              
Indebtedness              
Total real estate properties, gross   $ 35,724,000   $ 35,724,000      
Number of real estate properties | property   2   2      
Lease obligations   $ 9,361,000   $ 9,361,000      
Senior Unsecured Notes Due 2019              
Indebtedness              
Interest rate (as a percent) 3.25%            
Maximum borrowing capacity that may be increased (up to)   400,000,000   400,000,000      
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   $ 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