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Real Estate Disposition Activities (Details) (USD $)
12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
Dec. 31, 2010
Real estate disposition activities      
Number of communities sold 4    
Proceeds from sale of land $ 145,271,000    
Summary of income from discontinued operations      
Rental income 25,373,000 53,290,000 56,705,000
Operating and other expenses (8,075,000) (25,513,000) (31,164,000)
Interest expense, net (133,000) (4,808,000) (5,212,000)
Loss on extinguishment of debt (602,000) (3,880,000)  
Depreciation expense (4,068,000) (11,209,000) (12,379,000)
Income from discontinued operations 12,495,000 7,880,000 7,950,000
Unimproved land parcel in Chicago, IL
     
Real estate disposition activities      
Proceeds from sale of land 12,300,000    
Gain from sale of land 280,000    
Impairment charges $ 16,363,000    
Number of unimproved land parcels sold 1