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EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service Cost $ 76 $ 0
Interest cost 267 268
Expected return on plan assets (361) (455)
Amortization of unrecognized actuarial loss 163 175
Net periodic pension costs 145 (12)
Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service Cost 32 34
Interest cost 129 124
Amortization of unrecognized actuarial loss 0 0
Amortization of net prior service credit 83 83
Net periodic pension costs $ 244 $ 241