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FAIR VALUE DISCLOSURES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Balance Sheet Grouping, Financial Statement Captions    
Loan Receivable, Face Value $ 11,965 $ 0
Secured revolving credit facility 92,500 0
Carrying Amount
   
Balance Sheet Grouping, Financial Statement Captions    
Loans Receivable 12,017 0
Fair Value
   
Balance Sheet Grouping, Financial Statement Captions    
Loans Receivable   0
Senior Notes
   
Balance Sheet Grouping, Financial Statement Captions    
Debt Instrument, Face Amount 325,000 [1] 225,000 [1]
Senior Notes | Carrying Amount
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities 330,666 [2] 225,000 [2]
Senior Notes | Fair Value
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities   227,813
Mortgage indebtedness
   
Balance Sheet Grouping, Financial Statement Captions    
Debt Instrument, Face Amount 152,322 [1] 153,442 [1]
Mortgage indebtedness | Carrying Amount
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities 152,322 [2] 153,942 [2]
Mortgage indebtedness | Fair Value
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities   167,413
Revolving Credit Facility
   
Balance Sheet Grouping, Financial Statement Captions    
Debt Instrument, Face Amount   0 [1]
Secured revolving credit facility 92,500 [1]  
Revolving Credit Facility | Carrying Amount
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities   0 [2]
Revolving Credit Facility | Fair Value
   
Balance Sheet Grouping, Financial Statement Captions    
Financial liabilities $ 92,500 $ 0
[1] Face value represents amounts contractually due under the terms of the respective agreements.
[2] Carrying amounts represent the book value of financial instruments and include unamortized premiums (discounts).