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Consolidated Balance Sheets (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Notes and interest receivable, performing from affiliates and related parties $ 104,969,000 $ 89,982,000
Notes and interest receivable, non-performing, allowance for estimated losses from affiliates and related parties 8,962,000 9,926,000
Other assets, from affiliates and related parties 11,000 164,000
Deferred revenue, from sales to related parties 71,964,000 90,496,000
Accounts payable and other liabilities, affiliates and related parties 1,822,000 1,558,000
Preferred stock, par value $ 2 $ 2
Preferred stock, shares authorized 15,000,000 15,000,000
Preferred stock series A, shares issued 3,353,954 3,389,546
Preferred stock series A, shares outstanding 3,353,954 3,389,546
Preferred stock, liquidation preference 10 10
Preferred stock, shares held by subsidiaries 900,000 900,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 11,941,174 11,874,138
Common stock, shares outstanding 11,525,389 11,466,853
Treasury stock, shares 415,785 407,285
Treasury stock, shares held by TCI 236,587 276,972
Real Estate Held For Sale [Member]
    
Depreciation of real estate 1,752,000 0
Real Estate Subject To Sales Contracts [Member]
    
Depreciation of real estate $ 9,790,000 $ 75,639,000