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PREPAID EXPENSES, SUPPLIES AND OTHER RECEIVABLES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
PREPAID EXPENSES, SUPPLIES AND OTHER RECEIVABLES [Abstract]    
Prepaid expenses $ 3,143 $ 1,705
Supplies 977 974
Other receivables 484 708
Prepaid expenses, supplies and other receivables $ 4,604 $ 3,387