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Pro Forma Information (unaudited) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 28, 2015
Sep. 30, 2015
USD ($)
property
May. 31, 2015
USD ($)
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 ($)
shares
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
property
$ / shares
Dec. 31, 2014
USD ($)
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]                                        
Proceeds from sale of properties                                 $ 2,782 $ 27,325 $ 92,550  
Gain (Loss) on Sale of Properties                                   5,453 37,392  
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%         6.28%    
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       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    
Per common share data:                                        
Net income per share (in dollars per share) | $ / shares                                 $ 0.57 $ 0.73    
Revenues                 $ 267,519 $ 255,275 $ 247,402 $ 228,577 229,809 $ 216,873 $ 206,708 $ 191,497 $ 998,773 $ 844,887 761,438  
Interest Expense                                 150,881 $ 135,114 $ 117,819  
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                                  
Property operating expenses                                 25,514      
Principal amount of debt   $ 200,000               $ 200,000                    
Interest rate, description   LIBOR                                    
Interest rate added to the base rate (as a percent)   180.00%                                    
Per common share data:                                        
Interest Expense                                 $ 2,774      
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 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    
Per common share data:                                        
Interest Expense                                   $ 631    
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                              
Per common share data:                                        
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    
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    
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    
Mortgage debt assumed                                 $ 29,955 $ 15,630    
Weighted average interest rate on debt (as a percent)         4.73%                              
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%               3.25%      
Principal amount of debt             $ 400,000   $ 400,000       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%               4.75%      
Principal amount of debt             $ 250,000   $ 250,000       $ 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               $ 350,000      
Interest rate, description                                 LIBOR      
Interest rate added to the base rate (as a percent) 180.00%         1.40%                     140.00%      
Unsecured Debt | London Interbank Offered Rate (LIBOR) [Member]                                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                        
Interest rate, description           LIBOR