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Fair Value Measurements (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Sep. 30, 2013
Value Measurements    
Mortgage loans receivable $ 39,299,000 $ 40,668,000
Bonds payable 2,635,000 2,035,000
Bank borrowings 115,500,000  
Senior unsecured notes 185,800,000 185,800,000
Contingent liabilities 6,744,000 0
Discount rate used to value future cash inflows of the mortgage loans receivable (as a percent) 6.00% 5.50%
Discount rate used to value earn out liabilities (as a percent) 6.60%  
Senior unsecured notes maturing prior to 2019
    
Value Measurements    
Discount rate used to value future cash outflow (as a percent) 3.80% 3.90%
Senior unsecured notes maturing 2021
    
Value Measurements    
Discount rate used to value future cash outflow (as a percent) 4.30% 4.50%
Carrying Value
    
Value Measurements    
Mortgage loans receivable 39,299,000 40,668,000
Bonds payable 2,635,000 2,035,000
Bank borrowings 115,500,000  
Senior unsecured notes 185,800,000 185,800,000
Contingent liabilities 6,744,000  
Fair Value
    
Value Measurements    
Bonds payable 2,635,000 2,035,000
Bank borrowings 115,500,000  
Fair Value | Level 3
    
Value Measurements    
Mortgage loans receivable 44,939,000 45,751,000
Senior unsecured notes 194,838,000 191,424,000
Contingent liabilities $ 6,744,000