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Indebtedness (Details)
$ in Thousands
1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended 19 Months Ended
Sep. 28, 2015
USD ($)
Feb. 29, 2016
USD ($)
Jan. 31, 2016
USD ($)
property
Nov. 30, 2015
USD ($)
Oct. 31, 2015
USD ($)
property
item
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
property
May. 31, 2015
USD ($)
community
property
item
Apr. 30, 2015
USD ($)
Feb. 28, 2015
USD ($)
Jan. 31, 2015
USD ($)
building
property
Dec. 31, 2014
USD ($)
community
property
Dec. 31, 2014
USD ($)
agreement
property
Dec. 31, 2014
USD ($)
property
Oct. 31, 2014
USD ($)
property
Jun. 30, 2014
USD ($)
item
May. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
property
building
item
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
property
Dec. 31, 2015
USD ($)
property
community
building
item
Dec. 31, 2014
USD ($)
community
property
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
property
building
item
Feb. 22, 2016
USD ($)
Aug. 31, 2015
USD ($)
Indebtedness                                                      
Number of public issues of unsecured senior notes | item                                     5     5     5    
Principal amount of unsecured senior notes                       $ 1,743,628 $ 1,743,628 $ 1,743,628         $ 1,495,066   $ 1,743,628 $ 1,495,066 $ 1,743,628   $ 1,495,066    
Interest rate (as a percent)                             5.875%                        
Unsecured term loan facility                       1,750,000 1,750,000 1,750,000         1,500,000   1,750,000 1,500,000 1,750,000   1,500,000    
Aggregate principal amount of mortgage debt                                     667,535     667,535     667,535    
Carrying value of mortgaged properties                       $ 5,249,155 $ 5,249,155 $ 5,249,155         6,309,400   $ 5,249,155 $ 6,309,400 $ 5,249,155   6,309,400    
Weighted average interest rate on debt (as a percent)                       6.28% 6.28% 6.28%             6.28%   6.28%        
Number of properties acquired encumbering with assumed mortgage debt | property                                           9          
Assumption of mortgage notes payable                                           $ 181,433 $ 15,630 $ 12,266      
Unsecured revolving credit facility                       $ 80,000 $ 80,000 $ 80,000         775,000   $ 80,000 775,000 80,000   775,000 $ 593,000  
Loss on early extinguishment of debt                                       $ 1,409   (1,894) (12) $ (797)      
Repayment of debt                             $ 14,700                        
Sale of senior unsecured notes                                           200,000 $ 350,000        
Net proceeds after underwriting discounts from sale of senior unsecured notes                                   $ 644,889                  
Unsecured revolving credit facility                                                      
Indebtedness                                                      
Revolving credit facility, available amount                                     1,000,000     1,000,000     1,000,000    
Unsecured revolving credit facility, maximum borrowing capacity           $ 1,000,000                                         $ 750,000
Revolving credit facility, available amount                                     225,000     $ 225,000     225,000 $ 407,000  
Extension period of revolving credit facility                                           1 year          
Option to increase the borrowing capacity under revolving credit facility                                     $ 1,500,000     $ 1,500,000     $ 1,500,000    
Interest rate, description                                           LIBOR          
Interest rate added to the base rate (as a percent)                                           130.00%          
Revolving credit facility, interest rate payable (as a percent)                                     1.70%     1.70%     1.70%    
Weighted average interest rate on debt (as a percent)                       1.40% 1.40% 1.40%         1.50%   1.40% 1.50% 1.40% 1.60% 1.50%    
Interest expense and other associated costs incurred                                           $ 9,252 $ 3,094 $ 3,781      
Debt instrument, facility fee (as a percent)                                           30.00%          
Senior unsecured notes 4.30%                                                      
Indebtedness                                                      
Interest rate (as a percent)       4.30%                             4.30%     4.30%     4.30%    
Unsecured term loan facility                       $ 250,000 $ 250,000 $ 250,000             $ 250,000   250,000        
Repayments mortgage note       $ 250,000                                              
Loss on early extinguishment of debt                                           $ 175          
Senior unsecured notes 6.75%                                                      
Indebtedness                                                      
Principal amount of unsecured senior notes                                     $ 200,000     $ 200,000     $ 200,000    
Interest rate (as a percent)                                     6.75%     6.75%     6.75%    
Unsecured term loan facility                       200,000 200,000 200,000         $ 200,000   200,000 $ 200,000 200,000   $ 200,000    
Unsecured senior notes due 2021                                                      
Indebtedness                                                      
Principal amount of unsecured senior notes                                     $ 300,000     $ 300,000     $ 300,000    
Interest rate (as a percent)                                     6.75%     6.75%     6.75%    
Unsecured term loan facility                       300,000 300,000 300,000         $ 300,000   300,000 $ 300,000 300,000   $ 300,000    
Senior unsecured notes 5.625% due in 2042                                                      
Indebtedness                                                      
Principal amount of unsecured senior notes                                     $ 350,000     $ 350,000     $ 350,000    
Interest rate (as a percent)                                     5.625%     5.625%     5.625%    
Unsecured term loan facility                       $ 350,000 $ 350,000 $ 350,000         $ 350,000   $ 350,000 $ 350,000 $ 350,000   $ 350,000    
Senior Unsecured Notes 6.25 Percent Due 2046 [Member]                                                      
Indebtedness                                                      
Interest rate (as a percent)   6.25%                                                  
Sale of senior unsecured notes   $ 250,000                                                  
Net proceeds after underwriting discounts from sale of senior unsecured notes   242,125                                                  
Amount Granted to underwriters as a option to pruchase additional aggreagte principal amount   $ 37,500                                                  
Mortgages                                                      
Indebtedness                                                      
Interest rate (as a percent)                       6.37% 6.37% 6.37% 6.25%           6.37%   6.37%        
Unsecured term loan facility                                     82,569     82,569     82,569    
Aggregate principal amount of mortgage debt                                     $ 667,535     $ 667,535     $ 667,535    
Number of properties mortgaged | property                                     56     56     56    
Number of buildings mortgaged | building                                     57     57     57    
Carrying value of mortgaged properties                                     $ 1,083,616     $ 1,083,616     $ 1,083,616    
Principal repayment due until maturity             $ 4,351                                        
Repayments mortgage note     $ 6,115   $ 52,000   $ 4,867 $ 15,077 $ 6,274 $ 29,227                                  
Weighted average interest rate on debt (as a percent)             5.65%                 5.80%                      
Weighted average interest rate on debt (as a percent)                   6.02%                                  
Weighted average interest rate on prepaid debt (as a percent)     5.97%   5.64%   5.81% 5.70% 5.81%                                    
Loss on early extinguishment of debt                                           $ 290 $ 12        
Number of mortgage notes | item         2     4               2                      
Repayment of debt                           $ 11,308 $ 11,900 $ 35,807                      
Number of properties encumbered under mortgage notes | property     1   1   1 4       1 1 1 1           1   1        
Capital leases                                                      
Indebtedness                                                      
Interest rate (as a percent)                                     7.70%     7.70%     7.70%    
Number of properties mortgaged | item                                     2     2     2    
Carrying value of mortgaged properties                       $ 18,237 $ 18,237 $ 18,237         $ 19,400   $ 18,237 $ 19,400 $ 18,237   $ 19,400    
Number of properties recorded under capital lease | property                                     2     2     2    
Capital leases                                     $ 12,156     $ 12,156     $ 12,156    
Senior unsecured notes due 2019                                                      
Indebtedness                                                      
Principal amount of unsecured senior notes                                     $ 400,000     $ 400,000     $ 400,000    
Interest rate (as a percent)                                     3.25%     3.25%     3.25%    
Senior unsecured notes due 2024                                                      
Indebtedness                                                      
Principal amount of unsecured senior notes                                     $ 250,000     $ 250,000     $ 250,000    
Interest rate (as a percent)                                     4.75%     4.75%     4.75%    
Unsecured Debt                                                      
Indebtedness                                                      
Unsecured term loan facility                                 $ 350,000   $ 350,000     $ 350,000     $ 350,000    
Interest rate, description                                           LIBOR          
Interest rate added to the base rate (as a percent) 180.00%                               1.40%         140.00%          
Weighted average interest rate on debt (as a percent)                                     2.00%     1.60%     1.60%    
Maximum borrowing capacity that may be increased $ 400,000                                   $ 700,000     $ 700,000     $ 700,000    
Term Loan Due 2020                                                      
Indebtedness                                                      
Unsecured term loan facility                                     $ 350,000     $ 350,000     $ 350,000    
Weighted average interest rate on debt (as a percent)                                     1.60%     1.60%     1.60%    
Interest expense and other associated costs incurred                                         3,263 $ 5,686          
Term Loan Due 2022                                                      
Indebtedness                                                      
Unsecured term loan facility                                     $ 200,000     $ 200,000     $ 200,000    
Weighted average interest rate on debt (as a percent)                                     2.20%     2.20%     2.20%    
Unsecured Debt September 2015                                                      
Indebtedness                                                      
Unsecured term loan facility                                     $ 200,000     $ 200,000     $ 200,000    
Interest expense and other associated costs incurred                                     $ 1,061                
Senior Living Communities                                                      
Indebtedness                                                      
Unsecured term loan facility           $ 200,000                                          
Interest rate, description           LIBOR                                          
Interest rate added to the base rate (as a percent)           180.00%                                          
Number of Properties | community               37                                      
Number of communities | community               1                           19          
Senior Living Communities | Agreement to Acquire                                                      
Indebtedness                                                      
Assumption of mortgage notes payable               $ 151,477                                      
Weighted average interest rate on debt (as a percent)               4.57%                                      
Bridge loan commitment received                       $ 700,000 $ 700,000 $ 700,000             $ 700,000   $ 700,000        
Number of communities                       38 38                            
MOBs                                                      
Indebtedness                                                      
Number of properties acquired encumbering with assumed mortgage debt | building                     2                                
Number of Properties | property                     23                                
Number of communities | community                                             2        
MOBs | Mortgages | Significant Unobservable Inputs (Level 3)                                                      
Indebtedness                                                      
Assumption of mortgage notes payable                     $ 29,955                                
Fair value of mortgage notes payable                     $ 31,029                                
Weighted average interest rate on prepaid debt (as a percent)                                           4.73%