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EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) (Retirement Income Plan, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Retirement Income Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned during the period         
Interest cost on projected benefit obligation 253 267 266
Expected return on plan assets (328) (324) (302)
Amortization of net loss 61 38 34
Net periodic benefit, Total $ (14) $ (19) $ (2)