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EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit, Total $ 76    
Retirement Income Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned during the period
Interest cost on projected benefit obligation $ 259 $ 261 $ 235
Expected return on plan assets (421) (411) (369)
Amortization of net loss 76 37 68
Net periodic benefit, Total $ (86) $ (113) $ (66)