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Fair Value Measurements (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Fair Value Measurements    
Mortgage loans receivable $ 49,362,000 $ 53,081,000
Marketable securities   6,485,000 [1]
Bonds payable 2,635,000 3,200,000
Bank borrowings 68,000,000 56,000,000
Senior unsecured notes 100,000,000 100,000,000
Earn-out liabilities 6,524,000 6,305,000
Discount rate used to value future cash inflows of the mortgage loans receivable (as a percent) 6.00% 6.00%
Fair value of marketable debt securities as a percentage of quoted market price   100.00%
Discount rate used to value earn out liabilities (as a percent) 6.70% 6.80%
Senior unsecured notes
    
Fair Value Measurements    
Discount rate used to value future cash outflow (as a percent)   4.80%
5.74% senior unsecured term notes due January 14, 2019
    
Fair Value Measurements    
Discount rate used to value future cash outflow (as a percent) 3.80%  
4.80% senior unsecured term notes due July 20, 2021
    
Fair Value Measurements    
Discount rate used to value future cash outflow (as a percent) 4.30%  
Carrying Value
    
Fair Value Measurements    
Mortgage loans receivable 49,362,000 53,081,000
Marketable securities   6,485,000
Bonds payable 2,635,000 3,200,000
Bank borrowings 68,000,000 56,000,000
Senior unsecured notes 100,000,000 100,000,000
Earn-out liabilities 6,524,000 6,305,000
Fair Value
    
Fair Value Measurements    
Bonds payable 2,635,000 3,200,000
Bank borrowings 68,000,000 56,000,000
Fair Value | Level 2
    
Fair Value Measurements    
Marketable securities   6,500,000
Fair Value | Level 3
    
Fair Value Measurements    
Mortgage loans receivable 56,859,000 61,844,000
Senior unsecured notes 104,291,000 101,223,000
Earn-out liabilities $ 6,524,000 $ 6,305,000
[1] At December 31, 2011, we had a $6,500 face value investment in marketable securities issued by an entity that qualifies as a related party because the entity's Chief Executive Officer is on our Board of Directors. See Note 9. Transactions with Related Party for further discussion.