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EMPLOYEE BENEFIT PLANS (Details) (Unfunded Retirement Medical Plan [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Unfunded Retirement Medical Plan [Member]
   
Components of net periodic benefit cost [Abstract]    
Service cost $ 26 $ 32
Interest cost 21 32
Amortization of prior service cost (9) (9)
Amortization of loss 2 7
Net periodic benefit cost 40 62
Amount recognized in consolidated balance sheet for benefit obligations (included in other long-term obligations) $ 1,125  
Historical cash payments for retirement medical plan claims per year less than $100