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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
PROPERTIES:    
Accumulated depreciation on operating properties $ 300,260 $ 289,473
Real Estate Held for Sale, Accumulated Depreciation 2,522 0
Allowance for doubtful accounts for notes and other receivables $ 2,738 $ 5,100
Preferred stock, 20,000,000 shares authorized, $1 par value:    
Preferred stock, par value $ 1 $ 1
Preferred stock, shares authorized 20,000,000 20,000,000
Common stock, par value $ 1 $ 1
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 107,709,513 107,272,078
Treasury stock, shares 3,570,082 3,570,082
Series A Preferred Stock [Member]
   
Preferred stock, 20,000,000 shares authorized, $1 par value:    
Preferred stock, dividend rate 7.75% 7.75%
Preferred stock, shares issued 2,993,090 2,993,090
Preferred stock, shares outstanding 2,993,090 2,993,090
Preferred stock, liquidation preference $ 25 $ 25
Series B Preferred Stock [Member]
   
Preferred stock, 20,000,000 shares authorized, $1 par value:    
Preferred stock, dividend rate 7.50% 7.50%
Preferred stock, shares issued 3,791,000 3,791,000
Preferred stock, shares outstanding 3,791,000 3,791,000
Preferred stock, liquidation preference $ 25 $ 25