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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
PROPERTIES:  
Accumulated depreciation on operating properties$ 286,399$ 274,925
Allowance for doubtful accounts for notes and other receivables$ 5,423$ 6,287
Preferred stock, 20,000,000 shares authorized, $1 par value:  
Preferred stock, par value$ 1$ 1
Preferred stock, shares authorized20,000,00020,000,000
Common stock, par value$ 1$ 1
Common stock, shares authorized250,000,000250,000,000
Common stock, shares issued107,283,665106,961,959
Treasury stock, shares3,570,0823,570,082
Series A Preferred Stock [Member]
  
Preferred stock, 20,000,000 shares authorized, $1 par value:  
Preferred stock, dividend rate7.75%7.75%
Preferred stock, shares issued2,993,0902,993,090
Preferred stock, shares outstanding2,993,0902,993,090
Preferred stock, liquidation preference$ 25$ 25
Series B Preferred Stock [Member]
  
Preferred stock, 20,000,000 shares authorized, $1 par value:  
Preferred stock, dividend rate7.50%7.50%
Preferred stock, shares issued3,791,0003,791,000
Preferred stock, shares outstanding3,791,0003,791,000
Preferred stock, liquidation preference$ 25$ 25