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Debt Obligations (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Debt Obligations    
Amount outstanding under Unsecured Credit Agreement $ 41,000,000 $ 21,000,000
Amount outstanding Senior Unsecured Notes 251,633,000 255,800,000
Bank Borrowings
    
Debt Obligations    
Maximum availability under Unsecured Credit Agreement 240,000,000  
Possible total maximum availability under Unsecured Credit Agreement 350,000,000  
Additional extension period option 1 year  
Description of interest rate LIBOR  
Basis spread over base rate (as a percent) 1.50%  
Unused commitment fee (as a percent) 0.30%  
Amount borrowed 20,000,000  
Amount outstanding under Unsecured Credit Agreement 41,000,000  
Basis spread over base rate on borrowings outstanding (as a percent) 1.25%  
Amount available for borrowing under Unsecured Credit Agreement 199,000,000  
Senior unsecured notes
    
Debt Obligations    
Amount outstanding Senior Unsecured Notes 251,633,000 255,800,000
Weighted average interest rate (as a percent) 4.80% 4.80%
Repayments of debt 4,167,000  
Uncommitted Private Shelf Agreement
    
Debt Obligations    
Maximum available for issuance under private shelf agreement 30,000,000  
Bonds payable
    
Debt Obligations    
Weighted average interest rate (as a percent) 3.30%  
Repayments of debt 635,000 600,000
Amount outstanding 1,400,000 2,035,000
Number of assisted living properties securing debt instruments 5 5
Aggregate carrying value of real estate property securing the entity's debt obligation $ 6,320,000 $ 6,386,000