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Debt Obligations (Details) (USD $)
 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Line of Credit [Member]
Sep. 30, 2014
Line of Credit [Member]
London Interbank Offered Rate (LIBOR) [Member]
Oct. 31, 2014
Line of Credit [Member]
Subsequent Event [Member]
Oct. 31, 2014
Line of Credit [Member]
Subsequent Event [Member]
London Interbank Offered Rate (LIBOR) [Member]
Sep. 30, 2014
Senior Unsecured Debt [Member]
Dec. 31, 2013
Senior Unsecured Debt [Member]
Sep. 30, 2014
Senior Unsecured Term Note 4.50 Percent Due 31 July 2026 [Member]
Sep. 30, 2014
Bonds [Member]
property
Dec. 31, 2013
Bonds [Member]
Debt Obligations                      
Maximum availability under Unsecured Credit Agreement     $ 240,000,000   $ 400,000,000            
Possible total maximum availability under Unsecured Credit Agreement     350,000,000   600,000,000            
Description of interest rate       LIBOR   LIBOR          
Basis spread over base rate (as a percent)       1.50%   1.25%          
Unused commitment fee (as a percent)     0.30%   0.30%            
Amount borrowed     28,500,000   9,000,000            
Repayments of debt     30,000,000       4,167,000     635,000 600,000
Amount outstanding Senior Unsecured Notes 281,633,000 255,800,000 19,500,000   24,000,000   281,633,000 255,800,000      
Amount outstanding under Unsecured Credit Agreement 19,500,000 21,000,000                  
Amount available for borrowing under Unsecured Credit Agreement     220,500,000   376,000,000            
Weighted average interest rate (as a percent)             4.80%     3.30%  
Amount outstanding                   1,400,000 2,035,000
Number of assisted living properties securing debt instruments                   5  
Decrease in drawn pricing, basis point (as a percent)         0.25%            
Additional extension period option     1 year                
Extension of maturity date         1 year            
Stated interest rate (as a percent)                 4.50%    
Notes issued                 30,000,000    
Amount borrowed 30,000,000                    
Repayment amount         $ 4,500,000