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FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable $ 88,712 $ 59,989
Mortgage Notes Payable and Convertible Notes Payable 854,854 780,580
Estimate of Fair Value, Fair Value Disclosure
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable 88,712 59,989
Mortgage Notes Payable and Convertible Notes Payable $ 875,240 $ 784,489