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Pro Forma Information (unaudited) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 28, 2015
Sep. 30, 2015
USD ($)
community
property
May. 31, 2015
USD ($)
community
property
Feb. 28, 2015
USD ($)
shares
Jan. 31, 2015
USD ($)
building
property
May. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
shares
Jan. 31, 2013
USD ($)
shares
Dec. 31, 2015
USD ($)
community
property
$ / shares
Dec. 31, 2014
USD ($)
community
building
property
$ / shares
Dec. 31, 2013
USD ($)
Oct. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Interest rate (as a percent)                       5.875%
Mortgage debt assumed                 $ 181,433 $ 15,630 $ 12,266  
Weighted average interest rate on debt (as a percent)                   6.28%    
Interest expense                 150,881 $ 135,114 117,819  
Residents fees and services                 367,874 318,184 302,058  
Common shares issued in public offering | shares       31,050,000     15,525,000 11,500,000        
Net proceeds from issuance of common shares issued in public offering       $ 659,496     $ 322,807 $ 261,813 659,496 322,807 $ 261,813  
Principal amount of debt                 1,500,000 1,750,000    
Net proceeds after underwriting discounts from sale of senior unsecured notes             $ 644,889          
Pro forma results of operations                        
Total revenues                 1,033,591 1,024,821    
Net income                 $ 135,181 $ 171,893    
Net income per share (in dollars per share) | $ / shares                 $ 0.57 $ 0.73    
Senior Living Communities                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of properties acquired or agreed to be acquired | community     37                  
Number of communities | community     1           19      
Property operating expenses                 $ 25,514      
Interest expense                 2,774      
Residents fees and services     $ 9,750           35,814      
Principal amount of debt   $ 200,000                    
Interest rate, description   LIBOR                    
Interest rate added to the base rate (as a percent)   180.00%                    
MOBs                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of properties acquired or agreed to be acquired | property         23              
Number of communities | community                   2    
Number of buildings acquired | building                   3    
Aggregate purchase price properties, excluding closing costs                   $ 1,210,014    
Property operating expenses                   14,179    
Total rental income recognized                   67,294    
Interest expense                   $ 631    
Triple Net Leased Senior Living Communities                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of communities | community     20                  
Total rental income recognized                 23,756      
Interest expense                 $ 1,427      
Acquisition                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of properties acquired or agreed to be acquired | property         23              
Aggregate purchase price properties, excluding closing costs         $ 539,000              
Mortgage debt assumed         $ 29,995              
Weighted average interest rate on debt (as a percent)         4.73%              
Property operating expenses         $ 38,593              
Total rental income recognized         6,833              
Interest expense         $ 1,000              
Acquisition | Senior Living Communities                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of properties acquired or agreed to be acquired | property   39 39           39 2    
Number of communities | community   1 37             2    
Aggregate purchase price properties, excluding closing costs     $ 808,250                  
Mortgage debt assumed     $ 151,477           $ 151,477      
Weighted average interest rate on debt (as a percent)     4.57%                  
Property operating expenses                   $ 647    
Residents fees and services                   $ 887    
Acquisition | MOBs                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of properties acquired or agreed to be acquired | property                 23 2    
Number of buildings acquired | building         23         3    
Net closing adjustments         $ 7,377              
Mortgage debt assumed                 $ 29,955 $ 15,630    
Weighted average interest rate on debt (as a percent)         4.73%              
Acquisition | Triple Net Leased Senior Living Communities                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Number of communities | community   1             19      
Senior unsecured notes 3.25%                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Interest rate (as a percent)             3.25%   3.25%      
Principal amount of debt             $ 400,000   $ 400,000 400,000    
Senior unsecured notes 4.75%                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Interest rate (as a percent)             4.75%   4.75%      
Principal amount of debt             $ 250,000   $ 250,000 $ 250,000    
Unsecured Debt                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Principal amount of debt           $ 350,000     $ 350,000      
Interest rate, description                 LIBOR      
Interest rate added to the base rate (as a percent) 180.00%         1.40%     140.00%