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NOTES PAYABLE TO BANKS - Interest incurred on credit facility, interest capitalized related to facilities and equipment under construction, and related weighted average interest rates (Details) (Revolving credit facility, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revolving credit facility
       
Line of Credit Facility [Line Items]        
Interest incurred $ 324 $ 831 $ 677 $ 1,754
Capitalized interest $ 247 $ 196 $ 489 $ 517
Weighted average interest rate 3.12% 2.12% 3.05% 2.09%