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Indebtedness (Details)
1 Months Ended 3 Months Ended
May 04, 2017
USD ($)
property
Apr. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
property
Apr. 30, 2017
USD ($)
property
Mar. 31, 2017
USD ($)
property
building
note
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Indebtedness              
Number of public issues of unsecured senior notes | note         6    
Principal amount of unsecured senior notes         $ 1,723,484,000   $ 1,722,758,000
Total real estate properties, gross         7,767,756,000   7,730,523,000
Line of credit facility, periodic payment, principal         0    
Unsecured revolving credit facility         97,000,000   $ 327,000,000
Unsecured revolving credit facility              
Indebtedness              
Unsecured revolving credit facility, maximum borrowing capacity         $ 1,000,000,000    
Revolving credit facility, interest rate payable (as a percent)         2.20%    
Weighted average interest rate on debt (as a percent)         2.10% 1.70%  
Revolving credit facility, available amount         $ 903,000,000    
Interest expense and other associated costs incurred         2,364,000 $ 3,682,000  
Unsecured revolving credit facility         97,000,000    
Option to increase the borrowing capacity under revolving credit facility         $ 1,500,000,000    
Unsecured revolving credit facility | LIBOR              
Indebtedness              
Interest rate added to the base rate (as a percent)         1.30%    
Debt instrument, facility fee (as a percent)         0.30%    
Senior unsecured notes due 2019              
Indebtedness              
Principal amount of unsecured senior notes         $ 400,000,000    
Interest rate (as a percent)         3.25%    
Senior unsecured notes 6.75%              
Indebtedness              
Principal amount of unsecured senior notes         $ 200,000,000    
Interest rate (as a percent)         6.75%    
Senior unsecured notes due 2021              
Indebtedness              
Principal amount of unsecured senior notes         $ 300,000,000    
Interest rate (as a percent)         6.75%    
Senior unsecured notes 4.75%              
Indebtedness              
Principal amount of unsecured senior notes         $ 250,000,000    
Senior unsecured notes due 2024              
Indebtedness              
Interest rate (as a percent)         4.75%    
Senior unsecured notes 5.625% due in 2042              
Indebtedness              
Principal amount of unsecured senior notes         $ 350,000,000    
Interest rate (as a percent)         5.625%    
Senior unsecured notes 6.25% due in 2046              
Indebtedness              
Principal amount of unsecured senior notes         $ 250,000,000    
Interest rate (as a percent)         6.25%    
Term loan due 2020              
Indebtedness              
Interest rate (as a percent)         2.20%    
Unsecured term loan facility         $ 350,000,000    
Weighted average interest rate on debt (as a percent)         2.20% 1.90%  
Interest expense and other associated costs incurred         $ 1,916,000 $ 1,614,000  
Maximum borrowing capacity that may be increased         $ 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              
Interest rate (as a percent)         2.80%    
Unsecured term loan facility         $ 200,000,000    
Weighted average interest rate on debt (as a percent)         2.60% 2.30%  
Term loan due 2022 | LIBOR              
Indebtedness              
Interest rate added to the base rate (as a percent)         1.80%    
Mortgages              
Indebtedness              
Aggregate principal amount of mortgage debt         $ 1,107,067,000    
Number of properties mortgaged | property         43    
Number of buildings mortgaged | building         45    
Total real estate properties, gross         $ 1,621,656,000    
Capital leases              
Indebtedness              
Number of properties recorded under capital lease | property         2    
Total real estate properties, gross         $ 36,125,000    
Capital leases         11,278,000    
Unsecured debt              
Indebtedness              
Maximum borrowing capacity that may be increased         400,000,000    
Unsecured debt September 2015              
Indebtedness              
Interest expense and other associated costs incurred         1,299,000 $ 1,127,000  
Senior Living Communities | Term loan due 2022              
Indebtedness              
Unsecured term loan facility         $ 200,000,000    
Subsequent Event              
Indebtedness              
Early repayment of senior debt, unamortized premium   $ 5,449,000          
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property 1 17   17      
Repayments of First Mortgage Bond $ 10,579,000     $ 277,837,000      
Early repayment of senior debt, debt instrument, interest rate, stated percentage 6.15% 6.71%   6.71%      
Subsequent Event | Unsecured revolving credit facility              
Indebtedness              
Revolving credit facility, available amount $ 616,000,000            
Unsecured revolving credit facility $ 384,000,000            
Scenario, Forecast              
Indebtedness              
Early repayment of senior debt, number of real estate properties collateralized by senior debt | property     1        
Repayments of First Mortgage Bond     $ 8,807,000        
Early repayment of senior debt, debt instrument, interest rate, stated percentage     5.95%