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NOTES PAYABLE TO BANKS (Tables)
 6 Months Ended
Jun. 30, 2012
Debt Disclosure  
Schedule of interest incurred on the credit facility and the related weighted average interest rates
 
   
            Three months ended
             June 30,
    
             Six months ended
               June 30,
  
   
     2012
    
    2011
    
    2012
    
    2011
  
(in thousands except interest rate data
                        
Interest incurred
   $ 831     $ 1,139     $ 1,754     $ 2,297  
Capitalized interest
   $ 196     $ 142     $ 517     $ 233  
Weighted average interest rate
     2.12 %     3.19 %     2.09 %     3.25 %